/*
 * 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 org.oasisopen.sca.annotation.Reference;
import org.oasisopen.sca.annotation.Scope;

import sample.SampleClient;

/**
 * This client program shows how to create an SCA runtime, start it,
 * and locate and invoke a SCA component
 */
@Scope("COMPOSITE") 
public class CalculatorClientImpl implements SampleClient {
    
    private CalculatorService calculatorService;

    @Reference
    public void setCalculatorService(CalculatorService calculatorService) {
        this.calculatorService = calculatorService;
    }
    
    /**
     * This code used to be in an @Init method which removed the need for a JSE client
     * to prod the compoite. However OASIS is debating whether to allow references to be used
     * inside @Init methods and it can cause deadlocks in our runtime. So rather than make
     * changes in the runtime we are falling backon the JSE drive mechanism until we know
     * which way the specs are going
     */
    public void runSample() {
        System.out.println("SCA API ClassLoader: " + print(Reference.class.getClassLoader()));
        System.out.println("3 + 2=" + calculatorService.add(3, 2));
        System.out.println("3 - 2=" + calculatorService.subtract(3, 2));
        System.out.println("3 * 2=" + calculatorService.multiply(3, 2));
        System.out.println("3 / 2=" + calculatorService.divide(3, 2));
    }
    
    private static String print(ClassLoader cl) {
        StringBuffer buf = new StringBuffer();
        for (; cl != null;) {
            buf.append(cl.toString());
            buf.append(' ');
            cl = cl.getParent();
        }
        return buf.toString();
    }

}