Merge pull request #8 from tommyskeff/feat/error-propagation

add cancellation and refractor PromiseFactory

README.md

@@ -2,6 +2,8 @@
 
 Futur4J is a powerful and intuitive open-source Java library that simplifies asynchronous task scheduling, inspired by the concept of JavaScript promises.
 
+**This documentation is outdated. Please don't read it.**
+
 ## Dependency
 The Futur4J project is composed of multiple modules. It is required to include the `futur-api` module, and the other modules depend on it at runtime, however the others are optional and dependent on your use case.
 ### Gradle

build.gradle

@@ -1,4 +1,5 @@
 plugins {
+    id 'java'
     id 'com.github.johnrengelman.shadow' version '8.1.1'
     id 'io.github.gradle-nexus.publish-plugin' version '1.3.0'
 }
@@ -12,8 +13,8 @@ nexusPublishing {
 }
 
 subprojects {
-    group = "dev.tommyjs"
+    group = 'dev.tommyjs'
-    version = "2.1.3"
+    version = '2.2.0'
 
     apply plugin: 'java'
     apply plugin: 'com.github.johnrengelman.shadow'
@@ -27,4 +28,23 @@ subprojects {
     repositories {
         mavenCentral()
     }
+
+    dependencies {
+        implementation 'org.jetbrains:annotations:24.1.0'
+        implementation 'org.slf4j:slf4j-api:2.0.12'
+        compileOnly 'io.projectreactor:reactor-core:3.6.4'
+
+        testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+        testImplementation 'io.projectreactor:reactor-core:3.6.4'
+        testImplementation 'org.junit.jupiter:junit-jupiter:5.8.1'
+        testImplementation 'org.slf4j:slf4j-api:2.0.12'
+        testImplementation 'ch.qos.logback:logback-classic:1.5.3'
+    }
+
+    test {
+        useJUnitPlatform()
+        testLogging {
+            exceptionFormat = 'full'
+        }
+    }
 }

futur-api/build.gradle

@@ -1,4 +0,0 @@
-dependencies {
-    implementation("org.jetbrains:annotations:24.1.0")
-    implementation("org.slf4j:slf4j-api:2.0.12")
-}

futur-api/src/main/java/dev/tommyjs/futur/executor/DualPoolExecutor.java

@@ -4,9 +4,10 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 
-public class DualPoolExecutor implements PromiseExecutor {
+public class DualPoolExecutor implements PromiseExecutor<ScheduledFuture<?>> {
 
     private final @NotNull ScheduledExecutorService syncSvc;
     private final @NotNull ScheduledExecutorService asyncSvc;
@@ -16,18 +17,23 @@ public class DualPoolExecutor implements PromiseExecutor {
         this.asyncSvc = asyncSvc;
     }
 
-    @Override
-    public void runSync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
-        syncSvc.schedule(task, delay, unit);
-    }
-
-    @Override
-    public void runAsync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
-        asyncSvc.schedule(task, delay, unit);
-    }
-
     public static @NotNull DualPoolExecutor create(int asyncPoolSize) {
         return new DualPoolExecutor(Executors.newSingleThreadScheduledExecutor(), Executors.newScheduledThreadPool(asyncPoolSize));
     }
 
+    @Override
+    public ScheduledFuture<?> runSync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
+        return syncSvc.schedule(task, delay, unit);
+    }
+
+    @Override
+    public ScheduledFuture<?> runAsync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
+        return asyncSvc.schedule(task, delay, unit);
+    }
+
+    @Override
+    public void cancel(ScheduledFuture<?> task) {
+        task.cancel(true);
+    }
+
 }

futur-api/src/main/java/dev/tommyjs/futur/executor/PromiseExecutor.java

@@ -4,18 +4,20 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.concurrent.TimeUnit;
 
-public interface PromiseExecutor {
+public interface PromiseExecutor<T> {
 
-    void runSync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit);
+    T runSync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit);
 
-    void runAsync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit);
+    T runAsync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit);
 
-    default void runSync(@NotNull Runnable task) {
+    default T runSync(@NotNull Runnable task) {
-        runSync(task, 0L, TimeUnit.MILLISECONDS);
+        return runSync(task, 0L, TimeUnit.MILLISECONDS);
     }
 
-    default void runAsync(@NotNull Runnable task) {
+    default T runAsync(@NotNull Runnable task) {
-        runAsync(task, 0L, TimeUnit.MILLISECONDS);
+        return runAsync(task, 0L, TimeUnit.MILLISECONDS);
     }
 
+    void cancel(T task);
+
 }

futur-api/src/main/java/dev/tommyjs/futur/executor/SinglePoolExecutor.java

@@ -4,24 +4,11 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.TimeUnit;
-
-public class SinglePoolExecutor implements PromiseExecutor {
-
-    private final @NotNull ScheduledExecutorService service;
 
+public class SinglePoolExecutor extends DualPoolExecutor {
+    
     public SinglePoolExecutor(@NotNull ScheduledExecutorService service) {
-        this.service = service;
+        super(service, service);
-    }
-
-    @Override
-    public void runSync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
-        service.schedule(task, delay, unit);
-    }
-
-    @Override
-    public void runAsync(@NotNull Runnable task, long delay, @NotNull TimeUnit unit) {
-        service.schedule(task, delay, unit);
     }
 
     public static @NotNull SinglePoolExecutor create(int threadPoolSize) {

futur-api/src/main/java/dev/tommyjs/futur/impl/SimplePromise.java

@@ -2,33 +2,25 @@ package dev.tommyjs.futur.impl;
 
 import dev.tommyjs.futur.executor.PromiseExecutor;
 import dev.tommyjs.futur.promise.AbstractPromise;
-import dev.tommyjs.futur.promise.PromiseFactory;
+import dev.tommyjs.futur.promise.AbstractPromiseFactory;
+import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 
-public class SimplePromise<T> extends AbstractPromise<T> {
+public class SimplePromise<T, F> extends AbstractPromise<T, F> {
 
-    private final PromiseExecutor executor;
+    private final @NotNull AbstractPromiseFactory<F> factory;
-    private final Logger logger;
-    private final PromiseFactory factory;
 
-    public SimplePromise(PromiseExecutor executor, Logger logger, PromiseFactory factory) {
+    public SimplePromise(@NotNull AbstractPromiseFactory<F> factory) {
-        this.executor = executor;
-        this.logger = logger;
         this.factory = factory;
     }
 
-    @Override
+    @Deprecated
-    protected PromiseExecutor getExecutor() {
+    public SimplePromise(@NotNull PromiseExecutor<F> executor, @NotNull Logger logger, @NotNull AbstractPromiseFactory<F> factory) {
-        return executor;
+        this(factory);
     }
 
     @Override
-    protected Logger getLogger() {
+    public @NotNull AbstractPromiseFactory<F> getFactory() {
-        return logger;
-    }
-
-    @Override
-    public PromiseFactory getFactory() {
         return factory;
     }
 

futur-api/src/main/java/dev/tommyjs/futur/impl/SimplePromiseFactory.java

@@ -1,39 +1,34 @@
 package dev.tommyjs.futur.impl;
 
 import dev.tommyjs.futur.executor.PromiseExecutor;
-import dev.tommyjs.futur.promise.AbstractPromise;
+import dev.tommyjs.futur.promise.AbstractPromiseFactory;
 import dev.tommyjs.futur.promise.Promise;
-import dev.tommyjs.futur.promise.PromiseFactory;
 import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 
-public class SimplePromiseFactory implements PromiseFactory {
+public class SimplePromiseFactory<F> extends AbstractPromiseFactory<F> {
 
-    private final PromiseExecutor executor;
+    private final PromiseExecutor<F> executor;
     private final Logger logger;
 
-    public SimplePromiseFactory(PromiseExecutor executor, Logger logger) {
+    public SimplePromiseFactory(PromiseExecutor<F> executor, Logger logger) {
         this.executor = executor;
         this.logger = logger;
     }
 
-    @Override
-    public @NotNull <T> Promise<T> resolve(T value) {
-        AbstractPromise<T> promise = new SimplePromise<>(executor, logger, this);
-        promise.complete(value);
-        return promise;
-    }
-
     @Override
     public @NotNull <T> Promise<T> unresolved() {
-        return new SimplePromise<>(executor, logger, this);
+        return new SimplePromise<>(this);
     }
 
     @Override
-    public @NotNull <T> Promise<T> error(Throwable error) {
+    public @NotNull Logger getLogger() {
-        AbstractPromise<T> promise = new SimplePromise<>(executor, logger, this);
+        return logger;
-        promise.completeExceptionally(error);
+    }
-        return promise;
+
+    @Override
+    public @NotNull PromiseExecutor<F> getExecutor() {
+        return executor;
     }
 
 }

futur-api/src/main/java/dev/tommyjs/futur/impl/StaticPromise.java

@@ -1,25 +0,0 @@
-package dev.tommyjs.futur.impl;
-
-import dev.tommyjs.futur.executor.PromiseExecutor;
-import dev.tommyjs.futur.promise.AbstractPromise;
-import dev.tommyjs.futur.promise.PromiseFactory;
-import org.slf4j.Logger;
-
-public class StaticPromise<T> extends AbstractPromise<T> {
-
-    @Override
-    protected PromiseExecutor getExecutor() {
-        return StaticPromiseFactory.EXECUTOR;
-    }
-
-    @Override
-    protected Logger getLogger() {
-        return StaticPromiseFactory.LOGGER;
-    }
-
-    @Override
-    public PromiseFactory getFactory() {
-        return StaticPromiseFactory.INSTANCE;
-    }
-
-}

futur-api/src/main/java/dev/tommyjs/futur/impl/StaticPromiseFactory.java

@@ -1,48 +0,0 @@
-package dev.tommyjs.futur.impl;
-
-import dev.tommyjs.futur.executor.PromiseExecutor;
-import dev.tommyjs.futur.executor.SinglePoolExecutor;
-import dev.tommyjs.futur.promise.AbstractPromise;
-import dev.tommyjs.futur.promise.Promise;
-import dev.tommyjs.futur.promise.PromiseFactory;
-import org.jetbrains.annotations.NotNull;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.concurrent.Executors;
-
-public class StaticPromiseFactory implements PromiseFactory {
-
-    public static final @NotNull PromiseFactory INSTANCE;
-    public static final @NotNull PromiseExecutor EXECUTOR;
-    public static final @NotNull Logger LOGGER;
-
-    static {
-        INSTANCE = new StaticPromiseFactory();
-        EXECUTOR = SinglePoolExecutor.create(1);
-        LOGGER = LoggerFactory.getLogger(StaticPromiseFactory.class);
-    }
-
-    private StaticPromiseFactory() {
-    }
-
-    @Override
-    public @NotNull <T> Promise<T> resolve(T value) {
-        AbstractPromise<T> promise = new StaticPromise<>();
-        promise.complete(value);
-        return promise;
-    }
-
-    @Override
-    public @NotNull <T> Promise<T> unresolved() {
-        return new StaticPromise<>();
-    }
-
-    @Override
-    public @NotNull <T> Promise<T> error(Throwable error) {
-        AbstractPromise<T> promise = new StaticPromise<>();
-        promise.completeExceptionally(error);
-        return promise;
-    }
-
-}

futur-api/src/main/java/dev/tommyjs/futur/promise/AbstractPromise.java

@@ -10,12 +10,14 @@ import org.jetbrains.annotations.Nullable;
 import org.slf4j.Logger;
 
 import java.util.Collection;
+import java.util.concurrent.CancellationException;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
 
-public abstract class AbstractPromise<T> implements Promise<T> {
+public abstract class AbstractPromise<T, F> implements Promise<T> {
 
     private final Collection<PromiseListener<T>> listeners;
     private final AtomicReference<PromiseCompletion<T>> completion;
@@ -25,14 +27,14 @@ public abstract class AbstractPromise<T> implements Promise<T> {
         this.completion = new AtomicReference<>();
     }
 
-    protected abstract PromiseExecutor getExecutor();
+    public abstract @NotNull AbstractPromiseFactory<F> getFactory();
 
-    protected abstract Logger getLogger();
+    protected @NotNull PromiseExecutor<F> getExecutor() {
+        return getFactory().getExecutor();
+    }
 
-    @Deprecated
+    protected @NotNull Logger getLogger() {
-    @Override
+        return getFactory().getLogger();
-    public T join(long interval, long timeoutMillis) throws TimeoutException {
-        return join(timeoutMillis);
     }
 
     @Override
@@ -56,7 +58,7 @@ public abstract class AbstractPromise<T> implements Promise<T> {
         }
 
         if (completion == null)
-            throw new TimeoutException("Promise timed out after " + timeoutMillis + "ms");
+            throw new TimeoutException("Promise stopped waiting after " + timeoutMillis + "ms");
 
         return joinCompletion(completion);
     }
@@ -113,57 +115,47 @@ public abstract class AbstractPromise<T> implements Promise<T> {
     @Override
     public <V> @NotNull Promise<V> thenApplySync(@NotNull ExceptionalFunction<T, V> task) {
         Promise<V> promise = getFactory().unresolved();
-        addListener(ctx -> {
+        addListener(
-            if (ctx.isError()) {
+            res -> {
-                //noinspection ConstantConditions
+                Runnable runnable = createRunnable(res, promise, task);
-                promise.completeExceptionally(ctx.getException());
+                F future = getExecutor().runSync(runnable);
-                return;
+                promise.onCancel((e) -> getExecutor().cancel(future));
-            }
+            },
-
+            promise::completeExceptionally
-            Runnable runnable = createRunnable(ctx, promise, task);
+        );
-            getExecutor().runSync(runnable, 0L, TimeUnit.MILLISECONDS);
-        });
 
+        addChild(promise);
         return promise;
     }
 
     @Override
     public <V> @NotNull Promise<V> thenApplyDelayedSync(@NotNull ExceptionalFunction<T, V> task, long delay, @NotNull TimeUnit unit) {
         Promise<V> promise = getFactory().unresolved();
-        addListener(ctx -> {
+        addListener(
-            if (ctx.isError()) {
+            res -> {
-                //noinspection ConstantConditions
+                Runnable runnable = createRunnable(res, promise, task);
-                promise.completeExceptionally(ctx.getException());
+                F future = getExecutor().runSync(runnable, delay, unit);
-                return;
+                promise.onCancel((e) -> getExecutor().cancel(future));
-            }
+            },
-
+            promise::completeExceptionally
-            Runnable runnable = createRunnable(ctx, promise, task);
+        );
-            getExecutor().runSync(runnable, delay, unit);
-        });
 
+        addChild(promise);
         return promise;
     }
 
     @Override
     public <V> @NotNull Promise<V> thenComposeSync(@NotNull ExceptionalFunction<T, @NotNull Promise<V>> task) {
         Promise<V> promise = getFactory().unresolved();
-        thenApplySync(task).thenConsumeAsync(nestedPromise -> {
+        thenApplySync(task).addListener(
-            nestedPromise.addListener(ctx1 -> {
+            nestedPromise -> {
-                if (ctx1.isError()) {
+                nestedPromise.propagateResult(promise);
-                    //noinspection ConstantConditions
+                nestedPromise.addChild(promise);
-                    promise.completeExceptionally(ctx1.getException());
+            },
-                    return;
+            promise::completeExceptionally
-                }
+        );
-
-                promise.complete(ctx1.getResult());
-            });
-        }).addListener(ctx2 -> {
-            if (ctx2.isError()) {
-                //noinspection ConstantConditions
-                promise.completeExceptionally(ctx2.getException());
-            }
-        });
 
+        addChild(promise);
         return promise;
     }
 
@@ -220,83 +212,66 @@ public abstract class AbstractPromise<T> implements Promise<T> {
     @Override
     public <V> @NotNull Promise<V> thenApplyAsync(@NotNull ExceptionalFunction<T, V> task) {
         Promise<V> promise = getFactory().unresolved();
-        addListener(ctx -> {
+        addListener(
-            if (ctx.isError()) {
+            (res) -> {
-                //noinspection ConstantConditions
+                Runnable runnable = createRunnable(res, promise, task);
-                promise.completeExceptionally(ctx.getException());
+                F future = getExecutor().runAsync(runnable);
-                return;
+                promise.onCancel((e) -> getExecutor().cancel(future));
-            }
+            },
-
+            promise::completeExceptionally
-            Runnable runnable = createRunnable(ctx, promise, task);
+        );
-            getExecutor().runAsync(runnable, 0L, TimeUnit.MILLISECONDS);
-        });
 
+        addChild(promise);
         return promise;
     }
 
     @Override
     public <V> @NotNull Promise<V> thenApplyDelayedAsync(@NotNull ExceptionalFunction<T, V> task, long delay, @NotNull TimeUnit unit) {
         Promise<V> promise = getFactory().unresolved();
-        addListener(ctx -> {
+        addListener(
-            Runnable runnable = createRunnable(ctx, promise, task);
+            res -> {
-            getExecutor().runAsync(runnable, delay, unit);
+                Runnable runnable = createRunnable(res, promise, task);
-        });
+                F future = getExecutor().runAsync(runnable, delay, unit);
+                promise.onCancel((e) -> getExecutor().cancel(future));
+            },
+            promise::completeExceptionally
+        );
 
+        addChild(promise);
         return promise;
     }
 
     @Override
     public <V> @NotNull Promise<V> thenComposeAsync(@NotNull ExceptionalFunction<T, Promise<V>> task) {
         Promise<V> promise = getFactory().unresolved();
-        thenApplyAsync(task).thenConsumeAsync(nestedPromise -> {
+        thenApplyAsync(task).addListener(
-            nestedPromise.addListener(ctx1 -> {
+            nestedPromise -> {
-                if (ctx1.isError()) {
+                nestedPromise.propagateResult(promise);
-                    //noinspection ConstantConditions
+                nestedPromise.addChild(promise);
-                    promise.completeExceptionally(ctx1.getException());
+            },
-                    return;
+            promise::completeExceptionally
-                }
+        );
-
-                promise.complete(ctx1.getResult());
-            });
-        }).addListener(ctx2 -> {
-            if (ctx2.isError()) {
-                //noinspection ConstantConditions
-                promise.completeExceptionally(ctx2.getException());
-            }
-        });
 
+        addChild(promise);
         return promise;
     }
 
-    private <V> @NotNull Runnable createRunnable(@NotNull PromiseCompletion<T> ctx, @NotNull Promise<V> promise, @NotNull ExceptionalFunction<T, V> task) {
+    private <V> @NotNull Runnable createRunnable(T result, @NotNull Promise<V> promise, @NotNull ExceptionalFunction<T, V> task) {
         return () -> {
-            if (ctx.isError()) {
+            if (promise.isCompleted()) return;
-                //noinspection ConstantConditions
-                promise.completeExceptionally(ctx.getException());
-                return;
-            }
 
             try {
-                V result = task.apply(ctx.getResult());
+                V nextResult = task.apply(result);
-                promise.complete(result);
+                promise.complete(nextResult);
             } catch (Throwable e) {
                 promise.completeExceptionally(e);
             }
         };
     }
 
-    @Override
-    public @NotNull Promise<T> logExceptions() {
-        return logExceptions("Exception caught in promise chain");
-    }
-
     @Override
     public @NotNull Promise<T> logExceptions(@NotNull String message) {
-        return addListener(ctx -> {
+        return onError(e -> getLogger().error(message, e));
-            if (ctx.isError()) {
-                getLogger().error(message, ctx.getException());
-            }
-        });
     }
 
     @Override
@@ -320,19 +295,51 @@ public abstract class AbstractPromise<T> implements Promise<T> {
     }
 
     @Override
-    public @NotNull Promise<T> timeout(long time, @NotNull TimeUnit unit) {
+    public @NotNull Promise<T> addListener(@Nullable Consumer<T> successListener, @Nullable Consumer<Throwable> errorListener) {
-        getExecutor().runAsync(() -> {
+        return addListener((res) -> {
-            if (!isCompleted()) {
+            if (res.isError()) {
-                completeExceptionally(new TimeoutException("Promise timed out after " + time + " " + unit));
+                if (errorListener != null) errorListener.accept(res.getException());
+            } else {
+                if (successListener != null) successListener.accept(res.getResult());
             }
-        }, time, unit);
+        });
-
-        return this;
     }
 
     @Override
-    public @NotNull Promise<T> timeout(long ms) {
+    public @NotNull Promise<T> onSuccess(@NotNull Consumer<T> listener) {
-        return timeout(ms, TimeUnit.MILLISECONDS);
+        return addListener(listener, null);
+    }
+
+    @Override
+    public @NotNull Promise<T> onError(@NotNull Consumer<Throwable> listener) {
+        return addListener(null, listener);
+    }
+
+    @Override
+    public <E extends Throwable> @NotNull Promise<T> onError(@NotNull Class<E> clazz, @NotNull Consumer<E> listener) {
+        return onError((e) -> {
+            if (clazz.isAssignableFrom(e.getClass())) {
+                //noinspection unchecked
+                listener.accept((E) e);
+            }
+        });
+    }
+
+    @Override
+    public @NotNull Promise<T> onCancel(@NotNull Consumer<CancellationException> listener) {
+        return onError(CancellationException.class, listener);
+    }
+
+    @Deprecated
+    @Override
+    public @NotNull Promise<T> timeout(long time, @NotNull TimeUnit unit) {
+        return maxWaitTime(time, unit);
+    }
+
+    @Override
+    public @NotNull Promise<T> maxWaitTime(long time, @NotNull TimeUnit unit) {
+        F future = getExecutor().runAsync(() -> completeExceptionally(new TimeoutException("Promise stopped waiting after " + time + " " + unit)), time, unit);
+        return onError(e -> getExecutor().cancel(future));
     }
 
     private void handleCompletion(@NotNull PromiseCompletion<T> ctx) {
@@ -358,6 +365,26 @@ public abstract class AbstractPromise<T> implements Promise<T> {
         return this.completion.compareAndSet(null, completion);
     }
 
+    @Override
+    public void addChild(@NotNull Promise<?> child) {
+        child.onCancel((e) -> this.cancel(e.getMessage()));
+    }
+
+    @Override
+    public void propagateResult(@NotNull Promise<T> target) {
+        addListener(target::complete, target::completeExceptionally);
+    }
+
+    @Override
+    public void cancel() {
+        completeExceptionally(new CancellationException());
+    }
+
+    @Override
+    public void cancel(@NotNull String message) {
+        completeExceptionally(new CancellationException(message));
+    }
+
     @Override
     public void complete(@Nullable T result) {
         handleCompletion(new PromiseCompletion<>(result));

futur-api/src/main/java/dev/tommyjs/futur/promise/AbstractPromiseFactory.java

@@ -0,0 +1,181 @@
+package dev.tommyjs.futur.promise;
+
+import dev.tommyjs.futur.executor.PromiseExecutor;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import reactor.core.Disposable;
+import reactor.core.publisher.Mono;
+
+import java.util.*;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+public abstract class AbstractPromiseFactory<F> implements PromiseFactory {
+
+    public abstract @NotNull PromiseExecutor<F> getExecutor();
+
+    @Override
+    public <K, V> @NotNull Promise<Map.Entry<K, V>> combine(@NotNull Promise<K> p1, @NotNull Promise<V> p2) {
+        List<Promise<?>> promises = List.of(p1, p2);
+        return all(promises)
+            .thenApplyAsync((res) -> new AbstractMap.SimpleImmutableEntry<>(
+                Objects.requireNonNull(p1.getCompletion()).getResult(),
+                Objects.requireNonNull(p2.getCompletion()).getResult()
+            ));
+    }
+
+    @Override
+    public <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises, @Nullable BiConsumer<K, Throwable> exceptionHandler) {
+        if (promises.isEmpty()) return resolve(Collections.emptyMap());
+
+        Map<K, V> map = new HashMap<>();
+        Promise<Map<K, V>> promise = unresolved();
+        for (Map.Entry<K, Promise<V>> entry : promises.entrySet()) {
+            entry.getValue().addListener((ctx) -> {
+                synchronized (map) {
+                    if (ctx.getException() != null) {
+                        if (exceptionHandler == null) {
+                            promise.completeExceptionally(ctx.getException());
+                        } else {
+                            exceptionHandler.accept(entry.getKey(), ctx.getException());
+                            map.put(entry.getKey(), null);
+                        }
+                    } else {
+                        map.put(entry.getKey(), ctx.getResult());
+                    }
+
+                    if (map.size() == promises.size()) {
+                        promise.complete(map);
+                    }
+                }
+            });
+        }
+
+        return promise;
+    }
+
+    @Override
+    public <V> @NotNull Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises, @Nullable Consumer<Throwable> exceptionHandler) {
+        AtomicInteger index = new AtomicInteger();
+        return this.combine(
+            StreamSupport.stream(promises.spliterator(), false)
+                .collect(Collectors.toMap(k -> index.getAndIncrement(), v -> v)),
+            exceptionHandler != null ? (i, e) -> exceptionHandler.accept(e) : null
+        ).thenApplyAsync(v ->
+            v.entrySet().stream()
+                .sorted(Map.Entry.comparingByKey())
+                .map(Map.Entry::getValue)
+                .collect(Collectors.toList())
+        );
+    }
+
+    @Override
+    public <V> @NotNull Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises) {
+        return combine(promises, null);
+    }
+
+    @Override
+    public @NotNull Promise<List<PromiseCompletion<?>>> allSettled(@NotNull Iterable<Promise<?>> promiseIterable) {
+        List<Promise<?>> promises = new ArrayList<>();
+        promiseIterable.iterator().forEachRemaining(promises::add);
+
+        if (promises.isEmpty()) return resolve(Collections.emptyList());
+        PromiseCompletion<?>[] results = new PromiseCompletion<?>[promises.size()];
+
+        Promise<List<PromiseCompletion<?>>> promise = unresolved();
+        var iter = promises.listIterator();
+
+        while (iter.hasNext()) {
+            int index = iter.nextIndex();
+            iter.next().addListener((res) -> {
+                synchronized (results) {
+                    results[index] = res;
+                    if (Arrays.stream(results).allMatch(Objects::nonNull))
+                        promise.complete(Arrays.asList(results));
+                }
+            });
+        }
+
+        return promise;
+    }
+
+    @Override
+    public @NotNull Promise<Void> all(@NotNull Iterable<Promise<?>> promiseIterable) {
+        List<Promise<?>> promises = new ArrayList<>();
+        promiseIterable.iterator().forEachRemaining(promises::add);
+
+        if (promises.isEmpty()) return resolve(null);
+        AtomicInteger completed = new AtomicInteger();
+        Promise<Void> promise = unresolved();
+
+        for (Promise<?> p : promises) {
+            p.addListener((res) -> {
+                if (res.getException() != null) {
+                    promise.completeExceptionally(res.getException());
+                }
+
+                if (completed.incrementAndGet() == promises.size()) {
+                    promise.complete(null);
+                }
+            });
+        }
+
+        return promise;
+    }
+
+    @Override
+    public <T> @NotNull Promise<T> wrap(@NotNull CompletableFuture<T> future) {
+        Promise<T> promise = unresolved();
+
+        future.whenComplete((v, e) -> {
+            if (e != null) {
+                promise.completeExceptionally(e);
+            } else {
+                promise.complete(v);
+            }
+        });
+
+        promise.onCancel((e) -> future.cancel(true));
+        return promise;
+    }
+
+    @Override
+    public <T> @NotNull Promise<T> wrap(@NotNull Mono<T> mono) {
+        Promise<T> promise = this.unresolved();
+        Disposable disposable = mono.subscribe(promise::complete, promise::completeExceptionally);
+        promise.onCancel((e) -> disposable.dispose());
+        return promise;
+    }
+
+    @Override
+    public <T> @NotNull Promise<T> resolve(T value) {
+        Promise<T> promise = unresolved();
+        promise.complete(value);
+        return promise;
+    }
+
+    @Override
+    public <T> @NotNull Promise<T> error(@NotNull Throwable error) {
+        Promise<T> promise = unresolved();
+        promise.completeExceptionally(error);
+        return promise;
+    }
+
+    @Override
+    public @NotNull Promise<Void> erase(@NotNull Promise<?> p) {
+        Promise<Void> promise = unresolved();
+        p.addListener(ctx -> {
+            if (ctx.getException() != null) {
+                promise.completeExceptionally(ctx.getException());
+            } else {
+                promise.complete(null);
+            }
+        });
+        return promise;
+    }
+
+}

futur-api/src/main/java/dev/tommyjs/futur/promise/Promise.java

@@ -7,35 +7,16 @@ import dev.tommyjs.futur.function.ExceptionalSupplier;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.concurrent.CancellationException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
 
 public interface Promise<T> {
 
-    static <T> @NotNull Promise<T> resolve(T value, PromiseFactory factory) {
-        return factory.resolve(value);
-    }
-
-    static <T> @NotNull Promise<T> error(Throwable error, PromiseFactory factory) {
-        return factory.error(error);
-    }
-
-    static <T> @NotNull Promise<T> unresolved(PromiseFactory factory) {
-        return factory.unresolved();
-    }
-
-    static @NotNull Promise<Void> start(PromiseFactory factory) {
-        return factory.resolve(null);
-    }
-
     PromiseFactory getFactory();
 
-    @Deprecated
-    T join(long interval, long timeout) throws TimeoutException;
-
-    T join(long timeout) throws TimeoutException;
-
     @NotNull Promise<Void> thenRunSync(@NotNull ExceptionalRunnable task);
 
     @NotNull Promise<Void> thenRunDelayedSync(@NotNull ExceptionalRunnable task, long delay, @NotNull TimeUnit unit);
@@ -74,22 +55,56 @@ public interface Promise<T> {
 
     <V> @NotNull Promise<V> thenComposeAsync(@NotNull ExceptionalFunction<T, Promise<V>> task);
 
-    @NotNull Promise<T> logExceptions();
-
     @NotNull Promise<T> logExceptions(@NotNull String message);
 
+    default @NotNull Promise<T> logExceptions() {
+        return logExceptions("Exception caught in promise chain");
+    }
+
     @NotNull Promise<T> addListener(@NotNull PromiseListener<T> listener);
 
+    @NotNull Promise<T> addListener(@Nullable Consumer<T> successHandler, @Nullable Consumer<Throwable> errorHandler);
+
+    @NotNull Promise<T> onSuccess(@NotNull Consumer<T> listener);
+
+    @NotNull Promise<T> onError(@NotNull Consumer<Throwable> listener);
+
+    <E extends Throwable> @NotNull Promise<T> onError(@NotNull Class<E> clazz, @NotNull Consumer<E> listener);
+
+    @NotNull Promise<T> onCancel(@NotNull Consumer<CancellationException> listener);
+
+    @Deprecated
     @NotNull Promise<T> timeout(long time, @NotNull TimeUnit unit);
 
-    @NotNull Promise<T> timeout(long ms);
+    @Deprecated
+    default @NotNull Promise<T> timeout(long ms) {
+        return timeout(ms, TimeUnit.MILLISECONDS);
+    }
+
+    @NotNull Promise<T> maxWaitTime(long time, @NotNull TimeUnit unit);
+
+    default @NotNull Promise<T> maxWaitTime(long ms) {
+        return maxWaitTime(ms, TimeUnit.MILLISECONDS);
+    }
+
+    void addChild(@NotNull Promise<?> child);
+
+    void propagateResult(@NotNull Promise<T> target);
+
+    void cancel(@Nullable String reason);
+
+    default void cancel() {
+        cancel(null);
+    }
 
     void complete(@Nullable T result);
 
     void completeExceptionally(@NotNull Throwable result);
 
-    boolean isCompleted();
+    T join(long timeout) throws TimeoutException;
 
     @Nullable PromiseCompletion<T> getCompletion();
 
+    boolean isCompleted();
+
 }

futur-api/src/main/java/dev/tommyjs/futur/promise/PromiseCompletion.java

@@ -3,6 +3,8 @@ package dev.tommyjs.futur.promise;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.concurrent.CancellationException;
+
 public class PromiseCompletion<T> {
 
     private @Nullable T result;
@@ -36,6 +38,10 @@ public class PromiseCompletion<T> {
         return getException() != null;
     }
 
+    public boolean wasCanceled() {
+        return getException() instanceof CancellationException;
+    }
+
     public @Nullable T getResult() {
         return result;
     }

futur-api/src/main/java/dev/tommyjs/futur/promise/PromiseFactory.java

@@ -1,36 +1,61 @@
 package dev.tommyjs.futur.promise;
 
-import dev.tommyjs.futur.executor.PromiseExecutor;
-import dev.tommyjs.futur.executor.SinglePoolExecutor;
-import dev.tommyjs.futur.impl.SimplePromiseFactory;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Mono;
 
-import java.util.concurrent.Executors;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
 
 public interface PromiseFactory {
 
-    <T> @NotNull Promise<T> resolve(T value);
+    @NotNull Logger getLogger();
 
     <T> @NotNull Promise<T> unresolved();
 
-    <T> @NotNull Promise<T> error(Throwable error);
+    <K, V> @NotNull Promise<Map.Entry<K, V>> combine(@NotNull Promise<K> p1, @NotNull Promise<V> p2);
 
-    static PromiseFactory create(PromiseExecutor executor, Logger logger) {
+    <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises, @Nullable BiConsumer<K, Throwable> exceptionHandler);
-        return new SimplePromiseFactory(executor, logger);
+
+    default <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises) {
+        return combine(promises, null);
     }
 
-    static PromiseFactory create(PromiseExecutor executor) {
+    <V> @NotNull Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises, @Nullable Consumer<Throwable> exceptionHandler);
-        return create(executor, LoggerFactory.getLogger(SimplePromiseFactory.class));
+
+    default <V> @NotNull Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises) {
+        return combine(promises, null);
     }
 
-    static PromiseFactory create(int threadPoolSize) {
+    @NotNull Promise<List<PromiseCompletion<?>>> allSettled(@NotNull Iterable<Promise<?>> promiseIterable);
-        return create(SinglePoolExecutor.create(threadPoolSize));
+
+    default @NotNull Promise<List<PromiseCompletion<?>>> allSettled(@NotNull Promise<?>... promiseArray) {
+        return allSettled(Arrays.asList(promiseArray));
     }
 
-    static PromiseFactory create() {
+    @NotNull Promise<Void> all(@NotNull Iterable<Promise<?>> promiseIterable);
-        return create(Runtime.getRuntime().availableProcessors());
+
+    default @NotNull Promise<Void> all(@NotNull Promise<?>... promiseArray) {
+        return all(Arrays.asList(promiseArray));
     }
 
+    <T> @NotNull Promise<T> wrap(@NotNull CompletableFuture<T> future);
+
+    <T> @NotNull Promise<T> wrap(@NotNull Mono<T> mono);
+
+    <T> @NotNull Promise<T> resolve(T value);
+
+    default @NotNull Promise<Void> start() {
+        return resolve(null);
+    }
+
+    <T> @NotNull Promise<T> error(@NotNull Throwable error);
+
+    @NotNull Promise<Void> erase(@NotNull Promise<?> p);
+
 }

futur-api/src/main/java/dev/tommyjs/futur/promise/Promises.java

@@ -4,37 +4,21 @@ import dev.tommyjs.futur.function.ExceptionalFunction;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.*;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.locks.ReentrantLock;
 import java.util.function.BiConsumer;
-import java.util.stream.Collectors;
 
+/**
+ * @deprecated Use PromiseFactory instance methods instead.
+ */
+@Deprecated
 public class Promises {
 
     public static <K, V> @NotNull Promise<Map.Entry<K, V>> combine(@NotNull Promise<K> p1, @NotNull Promise<V> p2, PromiseFactory factory) {
-        Promise<Map.Entry<K, V>> promise = factory.unresolved();
+        return factory.combine(p1, p2);
-        p1.addListener(ctx -> {
-            if (ctx.isError()) {
-                //noinspection ConstantConditions
-                promise.completeExceptionally(ctx.getException());
-                return;
-            }
-
-            p2.addListener(ctx1 -> {
-                if (ctx1.isError()) {
-                    //noinspection ConstantConditions
-                    promise.completeExceptionally(ctx1.getException());
-                    return;
-                }
-
-                Map.Entry<K, V> result = new AbstractMap.SimpleEntry<>(ctx.getResult(), ctx1.getResult());
-                promise.complete(result);
-            });
-        });
-
-        return promise;
     }
 
     public static <K, V> @NotNull Promise<Map.Entry<K, V>> combine(@NotNull Promise<K> p1, @NotNull Promise<V> p2) {
@@ -42,29 +26,7 @@ public class Promises {
     }
 
     public static <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises, long timeout, @Nullable BiConsumer<K, Throwable> exceptionHandler, PromiseFactory factory) {
-        if (promises.isEmpty()) return factory.resolve(Collections.emptyMap());
+        return factory.combine(promises, exceptionHandler).timeout(timeout);
-
-        Map<K, V> map = new HashMap<>();
-        Promise<Map<K, V>> promise = factory.unresolved();
-        for (Map.Entry<K, Promise<V>> entry : promises.entrySet()) {
-            entry.getValue().addListener((ctx) -> {
-                synchronized (map) {
-                    if (ctx.isError()) {
-                        if (exceptionHandler == null) {
-                            //noinspection ConstantConditions
-                            promise.completeExceptionally(ctx.getException());
-                        } else {
-                            exceptionHandler.accept(entry.getKey(), ctx.getException());
-                            map.put(entry.getKey(), null);
-                        }
-                    } else {
-                        map.put(entry.getKey(), ctx.getResult());
-                    }
-                    if (map.size() == promises.size()) promise.complete(map);
-                }
-            });
-        }
-        return promise.timeout(timeout);
     }
 
     public static <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises, long timeout, boolean strict, PromiseFactory factory) {
@@ -80,16 +42,7 @@ public class Promises {
     }
 
     public static <V> @NotNull Promise<List<V>> combine(@NotNull List<Promise<V>> promises, long timeout, boolean strict, PromiseFactory factory) {
-        AtomicInteger index = new AtomicInteger();
+        return factory.combine(promises, strict ? null : (_v) -> {}).timeout(timeout);
-        return combine(
-            promises.stream().collect(Collectors.toMap(s -> index.getAndIncrement(), v -> v)),
-            timeout, strict, factory
-        ).thenApplySync(v ->
-            v.entrySet().stream()
-                .sorted(Map.Entry.comparingByKey())
-                .map(Map.Entry::getValue)
-                .collect(Collectors.toList())
-        );
     }
 
     public static <V> @NotNull Promise<List<V>> combine(@NotNull List<Promise<V>> promises, long timeout, PromiseFactory factory) {
@@ -101,20 +54,7 @@ public class Promises {
     }
 
     public static @NotNull Promise<Void> all(@NotNull List<Promise<?>> promises, PromiseFactory factory) {
-        if (promises.isEmpty()) return factory.resolve(null);
+        return factory.all(promises);
-
-        Promise<Void> promise = factory.unresolved();
-        for (Promise<?> p : promises) {
-            p.addListener((ctx) -> {
-                if (ctx.isError()) {
-                    //noinspection ConstantConditions
-                    promise.completeExceptionally(ctx.getException());
-                } else if (promises.stream().allMatch(Promise::isCompleted)) {
-                    promise.complete(null);
-                }
-            });
-        }
-        return promise;
     }
 
     public static <K, V> @NotNull Promise<Map<K, V>> combine(@NotNull Collection<K> keys, @NotNull ExceptionalFunction<K, V> mapper, long timeout, boolean strict, PromiseFactory factory) {
@@ -136,17 +76,7 @@ public class Promises {
     }
 
     public static @NotNull Promise<Void> erase(@NotNull Promise<?> p, PromiseFactory factory) {
-        Promise<Void> promise = factory.unresolved();
+        return factory.erase(p);
-        p.addListener(ctx -> {
-            if (ctx.isError()) {
-                //noinspection ConstantConditions
-                promise.completeExceptionally(ctx.getException());
-            } else {
-                promise.complete(null);
-            }
-        });
-
-        return promise;
     }
 
     public static @NotNull Promise<Void> erase(@NotNull Promise<?> p) {
@@ -154,16 +84,7 @@ public class Promises {
     }
 
     public static <T> @NotNull Promise<T> wrap(@NotNull CompletableFuture<T> future, PromiseFactory factory) {
-        Promise<T> promise = factory.unresolved();
+        return factory.wrap(future);
-        future.whenComplete((result, e) -> {
-            if (e != null) {
-                promise.completeExceptionally(e);
-            } else {
-                promise.complete(result);
-            }
-        });
-
-        return promise;
     }
 
 }

futur-api/src/test/java/dev/tommyjs/futur/PromiseTests.java

@@ -0,0 +1,48 @@
+package dev.tommyjs.futur;
+
+import dev.tommyjs.futur.executor.PromiseExecutor;
+import dev.tommyjs.futur.executor.SinglePoolExecutor;
+import dev.tommyjs.futur.impl.SimplePromiseFactory;
+import dev.tommyjs.futur.promise.PromiseFactory;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Mono;
+
+import java.util.Objects;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public final class PromiseTests {
+
+    private final Logger logger = LoggerFactory.getLogger(PromiseTests.class);
+    private final PromiseExecutor<ScheduledFuture<?>> executor = SinglePoolExecutor.create(1);
+    private final PromiseFactory pfac = new SimplePromiseFactory<>(executor, logger);
+
+    @Test
+    void testMono() {
+        Exception value = new Exception("Test Error");
+
+        var error = pfac.wrap(Mono.error(value));
+        assert Objects.requireNonNull(error.getCompletion()).isError();
+        assert error.getCompletion().getException() == value;
+
+        var resolved = pfac.wrap(Mono.just(value));
+        assert !Objects.requireNonNull(resolved.getCompletion()).isError();
+        assert resolved.getCompletion().getResult() == value;
+    }
+
+    @Test
+    void testErrorCancellation() throws InterruptedException {
+        var finish = new AtomicBoolean();
+        pfac.start()
+            .thenRunDelayedAsync(() -> finish.set(true), 50, TimeUnit.MILLISECONDS)
+            .thenRunAsync(() -> {})
+            .cancel();
+
+        Thread.sleep(100L);
+        assert !finish.get();
+    }
+
+}

futur-reactor/.gitignore

@@ -1,42 +0,0 @@
-.gradle
-build/
-!gradle/wrapper/gradle-wrapper.jar
-!**/src/main/**/build/
-!**/src/test/**/build/
-
-### IntelliJ IDEA ###
-.idea/modules.xml
-.idea/jarRepositories.xml
-.idea/compiler.xml
-.idea/libraries/
-*.iws
-*.iml
-*.ipr
-out/
-!**/src/main/**/out/
-!**/src/test/**/out/
-
-### Eclipse ###
-.apt_generated
-.classpath
-.factorypath
-.project
-.settings
-.springBeans
-.sts4-cache
-bin/
-!**/src/main/**/bin/
-!**/src/test/**/bin/
-
-### NetBeans ###
-/nbproject/private/
-/nbbuild/
-/dist/
-/nbdist/
-/.nb-gradle/
-
-### VS Code ###
-.vscode/
-
-### Mac OS ###
-.DS_Store

futur-reactor/build.gradle

@@ -1,5 +0,0 @@
-dependencies {
-    compileOnly(project(":futur-api"))
-    implementation("org.jetbrains:annotations:24.1.0")
-    implementation("io.projectreactor:reactor-core:3.6.4")
-}

futur-reactor/src/main/java/dev/tommyjs/futur/reactor/ReactorTransformer.java

@@ -1,16 +0,0 @@
-package dev.tommyjs.futur.reactor;
-
-import dev.tommyjs.futur.promise.Promise;
-import dev.tommyjs.futur.promise.PromiseFactory;
-import org.jetbrains.annotations.NotNull;
-import reactor.core.publisher.Mono;
-
-public class ReactorTransformer {
-
-    public static <T> @NotNull Promise<T> wrapMono(@NotNull Mono<T> mono, PromiseFactory factory) {
-        Promise<T> promise = factory.unresolved();
-        mono.subscribe(promise::complete, promise::completeExceptionally);
-        return promise;
-    }
-
-}

futur-static/build.gradle

@@ -0,0 +1,6 @@
+apply plugin: 'java-library'
+
+dependencies {
+    api project(':futur-api')
+    testImplementation project(':futur-api')
+}

futur-static/src/main/java/dev/tommyjs/futur/lazy/PromiseUtil.java

@@ -0,0 +1,93 @@
+package dev.tommyjs.futur.lazy;
+
+import dev.tommyjs.futur.promise.Promise;
+import dev.tommyjs.futur.promise.PromiseCompletion;
+import dev.tommyjs.futur.promise.PromiseFactory;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.slf4j.Logger;
+import reactor.core.publisher.Mono;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+
+public final class PromiseUtil {
+
+    private static PromiseFactory pfac = StaticPromiseFactory.INSTANCE;
+
+    public static @NotNull Logger getLogger() {
+        return pfac.getLogger();
+    }
+
+    public static void setPromiseFactory(PromiseFactory pfac) {
+        PromiseUtil.pfac = pfac;
+    }
+
+    public static @NotNull <T> Promise<T> unresolved() {
+        return pfac.unresolved();
+    }
+
+    public static @NotNull <K, V> Promise<Map.Entry<K, V>> combine(@NotNull Promise<K> p1, @NotNull Promise<V> p2) {
+        return pfac.combine(p1, p2);
+    }
+
+    public static @NotNull <K, V> Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises, @Nullable BiConsumer<K, Throwable> exceptionHandler) {
+        return pfac.combine(promises, exceptionHandler);
+    }
+
+    public static @NotNull <K, V> Promise<Map<K, V>> combine(@NotNull Map<K, Promise<V>> promises) {
+        return pfac.combine(promises);
+    }
+
+    public static @NotNull <V> Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises, @Nullable Consumer<Throwable> exceptionHandler) {
+        return pfac.combine(promises, exceptionHandler);
+    }
+
+    public static @NotNull <V> Promise<List<V>> combine(@NotNull Iterable<Promise<V>> promises) {
+        return pfac.combine(promises);
+    }
+
+    public static @NotNull Promise<List<PromiseCompletion<?>>> allSettled(@NotNull Iterable<Promise<?>> promiseIterable) {
+        return pfac.allSettled(promiseIterable);
+    }
+
+    public static @NotNull Promise<List<PromiseCompletion<?>>> allSettled(@NotNull Promise<?>... promiseArray) {
+        return pfac.allSettled(promiseArray);
+    }
+
+    public static @NotNull Promise<Void> all(@NotNull Iterable<Promise<?>> promiseIterable) {
+        return pfac.all(promiseIterable);
+    }
+
+    public static @NotNull Promise<Void> all(@NotNull Promise<?>... promiseArray) {
+        return pfac.all(promiseArray);
+    }
+
+    public static @NotNull <T> Promise<T> wrap(@NotNull CompletableFuture<T> future) {
+        return pfac.wrap(future);
+    }
+
+    public static @NotNull <T> Promise<T> wrap(@NotNull Mono<T> mono) {
+        return pfac.wrap(mono);
+    }
+
+    public static @NotNull <T> Promise<T> resolve(T value) {
+        return pfac.resolve(value);
+    }
+
+    public static @NotNull <T> Promise<T> error(@NotNull Throwable error) {
+        return pfac.error(error);
+    }
+
+    public static @NotNull Promise<Void> erase(@NotNull Promise<?> p) {
+        return pfac.erase(p);
+    }
+
+    public static @NotNull Promise<Void> start() {
+        return pfac.start();
+    }
+
+}

futur-static/src/main/java/dev/tommyjs/futur/lazy/StaticPromiseFactory.java

@@ -0,0 +1,39 @@
+package dev.tommyjs.futur.lazy;
+
+import dev.tommyjs.futur.executor.PromiseExecutor;
+import dev.tommyjs.futur.executor.SinglePoolExecutor;
+import dev.tommyjs.futur.impl.SimplePromise;
+import dev.tommyjs.futur.promise.AbstractPromiseFactory;
+import dev.tommyjs.futur.promise.Promise;
+import org.jetbrains.annotations.NotNull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.ScheduledFuture;
+
+public final class StaticPromiseFactory extends AbstractPromiseFactory<ScheduledFuture<?>> {
+
+    public final static StaticPromiseFactory INSTANCE = new StaticPromiseFactory();
+    private final static @NotNull SinglePoolExecutor EXECUTOR = SinglePoolExecutor.create(1);
+    private final static @NotNull Logger LOGGER = LoggerFactory.getLogger(StaticPromiseFactory.class);
+
+    private StaticPromiseFactory() {
+
+    }
+
+    @Override
+    public @NotNull <T> Promise<T> unresolved() {
+        return new SimplePromise<>(this);
+    }
+
+    @Override
+    public @NotNull Logger getLogger() {
+        return LOGGER;
+    }
+
+    @Override
+    public @NotNull PromiseExecutor<ScheduledFuture<?>> getExecutor() {
+        return EXECUTOR;
+    }
+
+}

settings.gradle

@@ -1,4 +1,4 @@
 rootProject.name = 'futur'
 
 include 'futur-api'
-include 'futur-reactor'
+include 'futur-static'