| /* |
| * Copyright (C) 2006 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| * in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| |
| package com.google.common.util.concurrent; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import com.google.common.annotations.GwtIncompatible; |
| import com.google.common.util.concurrent.AbstractFuture.TrustedFuture; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.TimeUnit; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import org.checkerframework.checker.nullness.compatqual.NullableDecl; |
| |
| /** Implementations of {@code Futures.immediate*}. */ |
| @GwtCompatible(emulated = true) |
| abstract class ImmediateFuture<V> implements ListenableFuture<V> { |
| private static final Logger log = Logger.getLogger(ImmediateFuture.class.getName()); |
| |
| @Override |
| public void addListener(Runnable listener, Executor executor) { |
| checkNotNull(listener, "Runnable was null."); |
| checkNotNull(executor, "Executor was null."); |
| try { |
| executor.execute(listener); |
| } catch (RuntimeException e) { |
| // ListenableFuture's contract is that it will not throw unchecked exceptions, so log the bad |
| // runnable and/or executor and swallow it. |
| log.log( |
| Level.SEVERE, |
| "RuntimeException while executing runnable " + listener + " with executor " + executor, |
| e); |
| } |
| } |
| |
| @Override |
| public boolean cancel(boolean mayInterruptIfRunning) { |
| return false; |
| } |
| |
| @Override |
| public abstract V get() throws ExecutionException; |
| |
| @Override |
| public V get(long timeout, TimeUnit unit) throws ExecutionException { |
| checkNotNull(unit); |
| return get(); |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| return false; |
| } |
| |
| @Override |
| public boolean isDone() { |
| return true; |
| } |
| |
| static class ImmediateSuccessfulFuture<V> extends ImmediateFuture<V> { |
| static final ImmediateSuccessfulFuture<Object> NULL = new ImmediateSuccessfulFuture<>(null); |
| @NullableDecl private final V value; |
| |
| ImmediateSuccessfulFuture(@NullableDecl V value) { |
| this.value = value; |
| } |
| |
| // TODO(lukes): Consider throwing InterruptedException when appropriate. |
| @Override |
| public V get() { |
| return value; |
| } |
| |
| @Override |
| public String toString() { |
| // Behaviour analogous to AbstractFuture#toString(). |
| return super.toString() + "[status=SUCCESS, result=[" + value + "]]"; |
| } |
| } |
| |
| @GwtIncompatible // TODO |
| static class ImmediateSuccessfulCheckedFuture<V, X extends Exception> extends ImmediateFuture<V> |
| implements CheckedFuture<V, X> { |
| @NullableDecl private final V value; |
| |
| ImmediateSuccessfulCheckedFuture(@NullableDecl V value) { |
| this.value = value; |
| } |
| |
| @Override |
| public V get() { |
| return value; |
| } |
| |
| @Override |
| public V checkedGet() { |
| return value; |
| } |
| |
| @Override |
| public V checkedGet(long timeout, TimeUnit unit) { |
| checkNotNull(unit); |
| return value; |
| } |
| |
| @Override |
| public String toString() { |
| // Behaviour analogous to AbstractFuture#toString(). |
| return super.toString() + "[status=SUCCESS, result=[" + value + "]]"; |
| } |
| } |
| |
| static final class ImmediateFailedFuture<V> extends TrustedFuture<V> { |
| ImmediateFailedFuture(Throwable thrown) { |
| setException(thrown); |
| } |
| } |
| |
| static final class ImmediateCancelledFuture<V> extends TrustedFuture<V> { |
| ImmediateCancelledFuture() { |
| cancel(false); |
| } |
| } |
| |
| @GwtIncompatible // TODO |
| static class ImmediateFailedCheckedFuture<V, X extends Exception> extends ImmediateFuture<V> |
| implements CheckedFuture<V, X> { |
| private final X thrown; |
| |
| ImmediateFailedCheckedFuture(X thrown) { |
| this.thrown = thrown; |
| } |
| |
| @Override |
| public V get() throws ExecutionException { |
| throw new ExecutionException(thrown); |
| } |
| |
| @Override |
| public V checkedGet() throws X { |
| throw thrown; |
| } |
| |
| @Override |
| public V checkedGet(long timeout, TimeUnit unit) throws X { |
| checkNotNull(unit); |
| throw thrown; |
| } |
| |
| @Override |
| public String toString() { |
| // Behaviour analogous to AbstractFuture#toString(). |
| return super.toString() + "[status=FAILURE, cause=[" + thrown + "]]"; |
| } |
| } |
| } |