/*
* Copyright 2002-2009 the original author or 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 org.springframework.core.task;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
/**
* Extended interface for asynchronous {@link TaskExecutor} implementations,
* offering an overloaded {@link #execute(Runnable, long)} variant with a start
* timeout parameter as well support for {@link java.util.concurrent.Callable}.
*
* <p>Note: The {@link java.util.concurrent.Executors} class includes a set of
* methods that can convert some other common closure-like objects, for example,
* {@link java.security.PrivilegedAction} to {@link Callable} before executing them.
*
* <p>Implementing this interface also indicates that the {@link #execute(Runnable)}
* method will not execute its Runnable in the caller's thread but rather
* asynchronously in some other thread.
*
* @author Juergen Hoeller
* @since 2.0.3
* @see SimpleAsyncTaskExecutor
* @see org.springframework.scheduling.SchedulingTaskExecutor
* @see java.util.concurrent.Callable
* @see java.util.concurrent.Executors
*/
public interface AsyncTaskExecutor extends TaskExecutor {
/** Constant that indicates immediate execution */
long TIMEOUT_IMMEDIATE = 0;
/** Constant that indicates no time limit */
long TIMEOUT_INDEFINITE = Long.MAX_VALUE;
/**
* Execute the given <code>task</code>.
* @param task the <code>Runnable</code> to execute (never <code>null</code>)
* @param startTimeout the time duration (milliseconds) within which the task is
* supposed to start. This is intended as a hint to the executor, allowing for
* preferred handling of immediate tasks. Typical values are {@link #TIMEOUT_IMMEDIATE}
* or {@link #TIMEOUT_INDEFINITE} (the default as used by {@link #execute(Runnable)}).
* @throws TaskTimeoutException in case of the task being rejected because
* of the timeout (i.e. it cannot be started in time)
* @throws TaskRejectedException if the given task was not accepted
*/
void execute(Runnable task, long startTimeout);
/**
* Submit a Runnable task for execution, receiving a Future representing that task.
* The Future will return a <code>null</code> result upon completion.
* @param task the <code>Runnable</code> to execute (never <code>null</code>)
* @return a Future representing pending completion of the task
* @throws TaskRejectedException if the given task was not accepted
*/
Future<?> submit(Runnable task);
/**
* Submit a Callable task for execution, receiving a Future representing that task.
* The Future will return the Callable's result upon completion.
* @param task the <code>Callable</code> to execute (never <code>null</code>)
* @return a Future representing pending completion of the task
* @throws TaskRejectedException if the given task was not accepted
*/
<T> Future<T> submit(Callable<T> task);
}
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