Source Code Cross Referenced for CustomizableThreadCreator.java in  » J2EE » spring-framework-2.5 » org » springframework » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util 
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.util;
018:
019:        /**
020:         * Simple customizable helper class for creating threads. Provides various
021:         * bean properties, such as thread name prefix, thread priority, etc.
022:         *
023:         * <p>Serves as base class for thread factories such as
024:         * {@link org.springframework.scheduling.concurrent.CustomizableThreadFactory}.
025:         *
026:         * @author Juergen Hoeller
027:         * @since 2.0.3
028:         * @see org.springframework.scheduling.concurrent.CustomizableThreadFactory
029:         */
030:        public class CustomizableThreadCreator {
031:
032:            private final Object monitor = new Object();
033:
034:            private String threadNamePrefix;
035:
036:            private int threadPriority = Thread.NORM_PRIORITY;
037:
038:            private boolean daemon = false;
039:
040:            private ThreadGroup threadGroup;
041:
042:            private int threadCount = 0;
043:
044:            /**
045:             * Create a new CustomizableThreadCreator with default thread name prefix.
046:             */
047:            public CustomizableThreadCreator() {
048:                this (null);
049:            }
050:
051:            /**
052:             * Create a new CustomizableThreadCreator with the given thread name prefix.
053:             * @param threadNamePrefix the prefix to use for the names of newly created threads
054:             */
055:            public CustomizableThreadCreator(String threadNamePrefix) {
056:                setThreadNamePrefix(threadNamePrefix);
057:            }
058:
059:            /**
060:             * Specify the prefix to use for the names of newly created threads.
061:             * Default is "SimpleAsyncTaskExecutor-".
062:             */
063:            public void setThreadNamePrefix(String threadNamePrefix) {
064:                this .threadNamePrefix = (threadNamePrefix != null ? threadNamePrefix
065:                        : getDefaultThreadNamePrefix());
066:            }
067:
068:            /**
069:             * Return the thread name prefix to use for the names of newly
070:             * created threads.
071:             */
072:            public String getThreadNamePrefix() {
073:                return this .threadNamePrefix;
074:            }
075:
076:            /**
077:             * Set the priority of the threads that this factory creates.
078:             * Default is 5.
079:             * @see java.lang.Thread#NORM_PRIORITY
080:             */
081:            public void setThreadPriority(int threadPriority) {
082:                this .threadPriority = threadPriority;
083:            }
084:
085:            /**
086:             * Return the priority of the threads that this factory creates.
087:             */
088:            public int getThreadPriority() {
089:                return this .threadPriority;
090:            }
091:
092:            /**
093:             * Set whether this factory is supposed to create daemon threads,
094:             * just executing as long as the application itself is running.
095:             * <p>Default is "false": Concrete factories usually support explicit
096:             * cancelling. Hence, if the application shuts down, Runnables will
097:             * by default finish their execution.
098:             * <p>Specify "true" for eager shutdown of threads which still
099:             * actively execute a Runnable.
100:             * @see java.lang.Thread#setDaemon
101:             */
102:            public void setDaemon(boolean daemon) {
103:                this .daemon = daemon;
104:            }
105:
106:            /**
107:             * Return whether this factory should create daemon threads.
108:             */
109:            public boolean isDaemon() {
110:                return this .daemon;
111:            }
112:
113:            /**
114:             * Specify the name of the thread group that threads should be created in.
115:             * @see #setThreadGroup
116:             */
117:            public void setThreadGroupName(String name) {
118:                this .threadGroup = new ThreadGroup(name);
119:            }
120:
121:            /**
122:             * Specify the thread group that threads should be created in.
123:             * @see #setThreadGroupName
124:             */
125:            public void setThreadGroup(ThreadGroup threadGroup) {
126:                this .threadGroup = threadGroup;
127:            }
128:
129:            /**
130:             * Return the thread group that threads should be created in
131:             * (or <code>null</code>) for the default group.
132:             */
133:            public ThreadGroup getThreadGroup() {
134:                return this .threadGroup;
135:            }
136:
137:            /**
138:             * Template method for the creation of a Thread.
139:             * <p>Default implementation creates a new Thread for the given
140:             * Runnable, applying an appropriate thread name.
141:             * @param runnable the Runnable to execute
142:             * @see #nextThreadName()
143:             */
144:            public Thread createThread(Runnable runnable) {
145:                Thread thread = new Thread(getThreadGroup(), runnable,
146:                        nextThreadName());
147:                thread.setPriority(getThreadPriority());
148:                thread.setDaemon(isDaemon());
149:                return thread;
150:            }
151:
152:            /**
153:             * Return the thread name to use for a newly created thread.
154:             * <p>Default implementation returns the specified thread name prefix
155:             * with an increasing thread count appended: for example,
156:             * "SimpleAsyncTaskExecutor-0".
157:             * @see #getThreadNamePrefix()
158:             */
159:            protected String nextThreadName() {
160:                int threadNumber = 0;
161:                synchronized (this .monitor) {
162:                    this .threadCount++;
163:                    threadNumber = this .threadCount;
164:                }
165:                return getThreadNamePrefix() + threadNumber;
166:            }
167:
168:            /**
169:             * Build the default thread name prefix for this factory.
170:             * @return the default thread name prefix (never <code>null</code>)
171:             */
172:            protected String getDefaultThreadNamePrefix() {
173:                return ClassUtils.getShortName(getClass()) + "-";
174:            }
175:
176:        }
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