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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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.android.camera.gallery;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
/**
* The interface for all the tasks that could be canceled.
*/
public interface Cancelable<T> {
/*
* Requests this <code>Cancelable</code> to be canceled. This function will
* return <code>true</code> if and only if the task is originally running
* and now begin requested for cancel.
*
* If subclass need to do more things to cancel the task. It can override
* the code like this:
* <pre>
* @Override
* public boolean requestCancel() {
* if (super.requestCancel()) {
* // do necessary work to cancel the task
* return true;
* }
* return false;
* }
* </pre>
*/
public boolean requestCancel();
public void await() throws InterruptedException;
/**
* Gets the results of this <code>Cancelable</code> task.
*
* @throws CancellationException if the task has been cancelled
* @throws ExecutionException if exception is thrown during the execution of
* the task
*/
public T get() throws InterruptedException, ExecutionException;
}
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