DataReader.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.superbiz.injection;

import javax.ejb.EJB;
import javax.ejb.Stateless;

/**
 * This is an EJB 3.1 style pojo stateless session bean
 * Every stateless session bean implementation must be annotated
 * using the annotation @Stateless
 * This EJB has 2 business interfaces: DataReaderRemote, a remote business
 * interface, and DataReaderLocal, a local business interface
 * <p/>
 * The instance variables 'dataStoreRemote' is annotated with the @EJB annotation:
 * this means that the application server, at runtime, will inject in this instance
 * variable a reference to the EJB DataStoreRemote
 * <p/>
 * The instance variables 'dataStoreLocal' is annotated with the @EJB annotation:
 * this means that the application server, at runtime, will inject in this instance
 * variable a reference to the EJB DataStoreLocal
 */
//START SNIPPET: code
@Stateless
public class DataReader {

    @EJB
    private DataStoreRemote dataStoreRemote;
    @EJB
    private DataStoreLocal dataStoreLocal;
    @EJB
    private DataStore dataStore;

    public String readDataFromLocalStore() {
        return "LOCAL:" + dataStoreLocal.getData();
    }

    public String readDataFromLocalBeanStore() {
        return "LOCALBEAN:" + dataStore.getData();
    }

    public String readDataFromRemoteStore() {
        return "REMOTE:" + dataStoreRemote.getData();
    }
}
//END SNIPPET: code