statelesssessionbean.java

SUN的JAVA EE5源代码java_ee_sdk-5_03-preview-samples

/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License).  You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the license at
 * https://glassfish.dev.java.net/public/CDDLv1.0.html or
 * glassfish/bootstrap/legal/CDDLv1.0.txt.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at glassfish/bootstrap/legal/CDDLv1.0.txt.
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 */
package enterprise.annotation_override_interceptor_ejb;

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;

import javax.ejb.Stateless;
import javax.interceptor.Interceptors;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

// This bean uses two interceptors to validate
// the input to its (only) business method.
// Note that a single interceptor would suffice
// but to demonstrate the use of interceptor
// chaining, we use two interceptors

@Stateless
@Interceptors({ArgumentsChecker.class})
public class StatelessSessionBean
    implements StatelessSession {

    private static final String KEY = "interceptorNameList";

    private static Map<String, List<String>> interceptorNamesForMethod
            = new HashMap<String, List<String>>();

    //The bean interceptor method just caches the interceptor names
    //  in a map which is queried in the getInterceptorNamesFor() method
    @AroundInvoke
    private Object intercept(InvocationContext invCtx)
    	throws Exception {
	System.out.println("Entered aroundInvoke for Bean");
        Map<String, Object> ctxData = invCtx.getContextData();
        List<String> interceptorNameList = (List<String>) ctxData.get(KEY);
        if (interceptorNameList == null) {
            interceptorNameList = new ArrayList<String>();
            ctxData.put(KEY, interceptorNameList);
        }

        //Add this interceptor also to the list of interceptors invoked!!
        interceptorNameList.add("StatelessSessionBean");
        
        //Cache the interceptor name list in a map that can be queried later
        String methodName = invCtx.getMethod().getName();
	synchronized (interceptorNamesForMethod) {
            interceptorNamesForMethod.put(methodName, interceptorNameList);
	}

	return invCtx.proceed();
    }

    // This business method is called after the interceptor methods.
    // Hence it is guaranteed that the argument to this method is not null
    // and it starts with a letter
    public String initUpperCase(String val) {
        String first = val.substring(0, 1);
        return first.toUpperCase() + val.substring(1);
    }

    // This business method is called after the interceptor methods.
    // Hence it is guaranteed that the argument to this method is not null
    // and it starts with a letter
    public String initLowerCase(String val) {
        String first = val.substring(0, 1);
        return first.toLowerCase() + val.substring(1);
    }

    //Note:-
    //  Since this method takes a int as a parameter, the ArgumentChecker
    //  inteceptor is disabled in the ejb-jar.xml for this method.
    public boolean isOddNumber(int val) {
        return ((val % 2) != 0);
    }

    /**
     * Only the default interceptor is used to intercept this method
     */
    public List<String> getInterceptorNamesFor(String methodName) {
        return interceptorNamesForMethod.get(methodName);
    }

}