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/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 calculator;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.oasisopen.sca.annotation.Reference;
/**
* An implementation of the Calculator service which just proxies
* to sync and asyn versions of the calculator service. This proxy
* exercises the various async interface alternatives
*/
public class CalculatorServiceProxyImpl implements CalculatorService {
@Reference
protected CalculateViaAsyncRef calculatorServiceRefSync;
@Reference
protected CalculateViaAsyncRef calculatorServiceRefAsync;
@Override
public String calculate(Integer n1) {
String result = null;
// calculate using a sync service
System.out.println("Calling sync service");
result = calculate(calculatorServiceRefSync, n1);
// calculate using an aycn service
System.out.println("Calling async service");
result += calculate(calculatorServiceRefAsync, n1);
return result;
}
// exercise sync and async versions of a service interface method
private String calculate(CalculateViaAsyncRef calculatorRef, Integer n1) {
// sync
String result = calculatorRef.calculate(1);
System.out.println("Sync client patern: result = " + result);
// async poll
Future<String> future = calculatorRef.calculateAsync(20);
while (!future.isDone()){
System.out.println("Waiting for poll");
}
try {
result = future.get();
System.out.println("Async client poll patern: result = " + result);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// async callback
CalculatorAsyncHandler handler = new CalculatorAsyncHandler();
future = calculatorRef.calculateAsync(3, handler);
while (!future.isDone()){
System.out.println("Waiting for callback");
}
return result;
}
}
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