Source Code Cross Referenced for BackgroundProcess.java in  » J2EE » webwork-2.2.6 » com » opensymphony » webwork » interceptor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » webwork 2.2.6 » com.opensymphony.webwork.interceptor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2002-2007 by OpenSymphony
003:         * All rights reserved.
004:         */
005:        package com.opensymphony.webwork.interceptor;
006:
007:        import com.opensymphony.xwork.ActionInvocation;
008:
009:        import java.io.Serializable;
010:
011:        /**
012:         * Background thread to be executed by the ExecuteAndWaitInterceptor.
013:         *
014:         * @author <a href="plightbo@gmail.com">Pat Lightbody</a>
015:         * @author <a href="jim@jimvanfleet.com">Jim Van Fleet</a>
016:         */
017:        public class BackgroundProcess implements  Serializable {
018:
019:            private static final long serialVersionUID = 8146242696076042381L;
020:
021:            protected Object action;
022:            protected ActionInvocation invocation;
023:            protected String result;
024:            protected Exception exception;
025:            protected boolean done;
026:
027:            public BackgroundProcess(String threadName,
028:                    final ActionInvocation invocation, int threadPriority) {
029:                this .invocation = invocation;
030:                this .action = invocation.getAction();
031:                try {
032:                    final Thread t = new Thread(new Runnable() {
033:                        public void run() {
034:                            try {
035:                                beforeInvocation();
036:                                result = invocation.invokeActionOnly();
037:                                afterInvocation();
038:                            } catch (Exception e) {
039:                                exception = e;
040:                            }
041:
042:                            done = true;
043:                        }
044:                    });
045:                    t.setName(threadName);
046:                    t.setPriority(threadPriority);
047:                    t.start();
048:                } catch (Exception e) {
049:                    exception = e;
050:                }
051:            }
052:
053:            /**
054:             * called before the background thread determines the result code
055:             * from the ActionInvocation.
056:             *
057:             * @throws Exception any exception thrown will be thrown, in turn, by the ExecuteAndWaitInterceptor
058:             */
059:            protected void beforeInvocation() throws Exception {
060:            }
061:
062:            /**
063:             * called after the background thread determines the result code
064:             * from the ActionInvocation, but before the background thread is
065:             * marked as done.
066:             *
067:             * @throws Exception any exception thrown will be thrown, in turn, by the ExecuteAndWaitInterceptor
068:             */
069:            protected void afterInvocation() throws Exception {
070:            }
071:
072:            /**
073:             * Retrieves the action.
074:             *
075:             * @return  the action.
076:             */
077:            public Object getAction() {
078:                return action;
079:            }
080:
081:            /**
082:             * Retrieves the action invocation.
083:             * 
084:             * @return the action invocation
085:             */
086:            public ActionInvocation getInvocation() {
087:                return invocation;
088:            }
089:
090:            /**
091:             * Gets the result of the background process.
092:             * 
093:             * @return  the result; <tt>null</tt> if not done.
094:             */
095:            public String getResult() {
096:                return result;
097:            }
098:
099:            /**
100:             * Gets the exception if any was thrown during the execution of the background process.
101:             * 
102:             * @return the exception or <tt>null</tt> if no exception was thrown.
103:             */
104:            public Exception getException() {
105:                return exception;
106:            }
107:
108:            /**
109:             * Returns the status of the background process.
110:             * 
111:             * @return <tt>true</tt> if finished, <tt>false</tt> otherwise
112:             */
113:            public boolean isDone() {
114:                return done;
115:            }
116:        }
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