/*
* Copyright (C) 2009 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 javax.annotation.Nullable;
/**
* A {@link ListenableFuture} whose result may be set by a {@link #set(Object)}
* or {@link #setException(Throwable)} call. It may also be cancelled.
*
* @author Sven Mawson
* @since 9.0 (in 1.0 as {@code ValueFuture})
*/
public final class SettableFuture<V> extends AbstractFuture<V> {
/**
* Creates a new {@code SettableFuture} in the default state.
*/
public static <V> SettableFuture<V> create() {
return new SettableFuture<V>();
}
/**
* Explicit private constructor, use the {@link #create} factory method to
* create instances of {@code SettableFuture}.
*/
private SettableFuture() {}
/**
* Sets the value of this future. This method will return {@code true} if
* the value was successfully set, or {@code false} if the future has already
* been set or cancelled.
*
* @param value the value the future should hold.
* @return true if the value was successfully set.
*/
@Override
public boolean set(@Nullable V value) {
return super.set(value);
}
/**
* Sets the future to having failed with the given exception. This exception
* will be wrapped in an {@code ExecutionException} and thrown from the {@code
* get} methods. This method will return {@code true} if the exception was
* successfully set, or {@code false} if the future has already been set or
* cancelled.
*
* @param throwable the exception the future should hold.
* @return true if the exception was successfully set.
*/
@Override
public boolean setException(Throwable throwable) {
return super.setException(throwable);
}
}
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