001: /**
002: * EasyBeans
003: * Copyright (C) 2006 Bull S.A.S.
004: * Contact: easybeans@ow2.org
005: *
006: * This library is free software; you can redistribute it and/or
007: * modify it under the terms of the GNU Lesser General Public
008: * License as published by the Free Software Foundation; either
009: * version 2.1 of the License, or any later version.
010: *
011: * This library is distributed in the hope that it will be useful,
012: * but WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * Lesser General Public License for more details.
015: *
016: * You should have received a copy of the GNU Lesser General Public
017: * License along with this library; if not, write to the Free Software
018: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
019: * USA
020: *
021: * --------------------------------------------------------------------------
022: * $Id: StatelessBean.java 1970 2007-10-16 11:49:25Z benoitf $
023: * --------------------------------------------------------------------------
024: */package org.ow2.easybeans.examples.statelessbean;
025:
026: import javax.ejb.Local;
027: import javax.ejb.Remote;
028: import javax.ejb.Stateless;
029: import javax.interceptor.AroundInvoke;
030: import javax.interceptor.ExcludeClassInterceptors;
031: import javax.interceptor.Interceptors;
032: import javax.interceptor.InvocationContext;
033:
034: /**
035: * Simple stateless bean.
036: * @author Florent Benoit
037: */
038: @Stateless
039: @Local(StatelessLocal.class)
040: @Remote(StatelessRemote.class)
041: @Interceptors({StatelessInterceptor.class})
042: public class StatelessBean implements StatelessRemote {
043:
044: /**
045: * Hello world.
046: */
047: public void helloWorld() {
048: System.out.println("Hello world !");
049: }
050:
051: /**
052: * Compute a + b.
053: * @param a first int
054: * @param b second int
055: * @return a + b
056: */
057: @Interceptors({StatelessOnlyAddMethodInterceptor.class})
058: public int add(final int a, final int b) {
059: return a + b;
060: }
061:
062: /**
063: * Divide a by b.
064: * @param a first int
065: * @param b second int
066: * @return a / b
067: */
068: public int div(final int a, final int b) {
069: if (b == 0) {
070: throw new IllegalArgumentException("cannot divide by 0");
071: }
072: return a / b;
073: }
074:
075: /**
076: * Methods without interceptors.
077: */
078: @ExcludeClassInterceptors
079: public void notInterceptedMethod() {
080:
081: }
082:
083: /**
084: * Trace method's time.
085: * @param invocationContext contains attributes of invocation
086: * @return method's invocation result
087: * @throws Exception if invocation fails
088: */
089: @AroundInvoke
090: public Object trace(final InvocationContext invocationContext)
091: throws Exception {
092: System.out.println("TraceInterceptor : method '"
093: + invocationContext.getMethod().getName() + "'.");
094: long startPeriod = System.nanoTime();
095: try {
096: return invocationContext.proceed();
097: } finally {
098: long elapsed = System.nanoTime() - startPeriod;
099: System.out.println("TraceInterceptor : Elapsed time = "
100: + elapsed + " ns");
101: }
102: }
103:
104: }
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