Source Code Cross Referenced for ConcurrentTaskExecutor.java in  » J2EE » spring-framework-2.0.6 » org » springframework » scheduling » backportconcurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.scheduling.backportconcurrent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.scheduling.backportconcurrent;
018:
019:        import edu.emory.mathcs.backport.java.util.concurrent.Executor;
020:        import edu.emory.mathcs.backport.java.util.concurrent.Executors;
021:        import edu.emory.mathcs.backport.java.util.concurrent.RejectedExecutionException;
022:
023:        import org.springframework.core.task.TaskRejectedException;
024:        import org.springframework.scheduling.SchedulingTaskExecutor;
025:
026:        /**
027:         * Adapter that takes a JSR-166 backport
028:         * <code>edu.emory.mathcs.backport.java.util.concurrent.Executor</code> and
029:         * exposes a Spring {@link org.springframework.core.task.TaskExecutor} for it.
030:         *
031:         * <p><b>NOTE:</b> This class implements Spring's
032:         * {@link org.springframework.core.task.TaskExecutor} interface as well as
033:         * the JSR-166 {@link edu.emory.mathcs.backport.java.util.concurrent.Executor}
034:         * interface, with the former being the primary interface, the other just
035:         * serving as secondary convenience. For this reason, the exception handling
036:         * follows the TaskExecutor contract rather than the Executor contract, in
037:         * particular regarding the {@link org.springframework.core.task.TaskRejectedException}.
038:         *
039:         * <p>Note that there is a pre-built {@link ThreadPoolTaskExecutor} that allows for
040:         * defining a JSR-166 backport
041:         * {@link edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor} in bean
042:         * style, exposing it as a Spring {@link org.springframework.core.task.TaskExecutor}
043:         * directly. This is a convenient alternative to a raw ThreadPoolExecutor
044:         * definition with a separate definition of the present adapter class.
045:         *
046:         * @author Juergen Hoeller
047:         * @since 2.0.3
048:         * @see edu.emory.mathcs.backport.java.util.concurrent.Executor
049:         * @see edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor
050:         * @see edu.emory.mathcs.backport.java.util.concurrent.Executors
051:         * @see ThreadPoolTaskExecutor
052:         */
053:        public class ConcurrentTaskExecutor implements  SchedulingTaskExecutor,
054:                Executor {
055:
056:            private Executor concurrentExecutor;
057:
058:            /**
059:             * Create a new ConcurrentTaskExecutor,
060:             * using a single thread executor as default.
061:             * @see edu.emory.mathcs.backport.java.util.concurrent.Executors#newSingleThreadExecutor()
062:             */
063:            public ConcurrentTaskExecutor() {
064:                setConcurrentExecutor(null);
065:            }
066:
067:            /**
068:             * Create a new ConcurrentTaskExecutor,
069:             * using the given JSR-166 backport concurrent executor.
070:             * @param concurrentExecutor the JSR-166 backport concurrent executor to delegate to
071:             */
072:            public ConcurrentTaskExecutor(Executor concurrentExecutor) {
073:                setConcurrentExecutor(concurrentExecutor);
074:            }
075:
076:            /**
077:             * Specify the JSR-166 backport concurrent executor to delegate to.
078:             */
079:            public void setConcurrentExecutor(Executor concurrentExecutor) {
080:                this .concurrentExecutor = (concurrentExecutor != null ? concurrentExecutor
081:                        : Executors.newSingleThreadExecutor());
082:            }
083:
084:            /**
085:             * Return the JSR-166 backport concurrent executor that this adapter
086:             * delegates to.
087:             */
088:            public Executor getConcurrentExecutor() {
089:                return this .concurrentExecutor;
090:            }
091:
092:            /**
093:             * Delegates to the specified JSR-166 backport concurrent executor.
094:             * @see edu.emory.mathcs.backport.java.util.concurrent.Executor#execute(Runnable)
095:             */
096:            public void execute(Runnable task) {
097:                try {
098:                    this .concurrentExecutor.execute(task);
099:                } catch (RejectedExecutionException ex) {
100:                    throw new TaskRejectedException("Executor ["
101:                            + this .concurrentExecutor
102:                            + "] did not accept task: " + task, ex);
103:                }
104:            }
105:
106:            /**
107:             * This task executor prefers short-lived work units.
108:             */
109:            public boolean prefersShortLivedTasks() {
110:                return true;
111:            }
112:
113:        }
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