_br-ode-1.X.svn/jacob/src/main/java/org/apache/ode/jacob/examples/synch/SynchPrinter.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
 *
 *    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 org.apache.ode.jacob.examples.synch;

import org.apache.ode.jacob.JacobRunnable;
import org.apache.ode.jacob.SynchChannel;
import org.apache.ode.jacob.SynchChannelListener;
import org.apache.ode.jacob.vpu.ExecutionQueueImpl;
import org.apache.ode.jacob.vpu.JacobVPU;

/**
 * Example JACOB process illustrating the use of {@link SynchPrint} 
 * 
 * @author Maciej Szefler <a href="mailto:mbs@fivesight.com">mbs</a>
 */
public class SynchPrinter {

    public static final class SystemPrinter extends JacobRunnable {
        private static final long serialVersionUID = -8516348116865575605L;

        private SynchPrintChannel _self;

        public SystemPrinter(SynchPrintChannel self) {
            _self = self;
        }

        public void run() {
            object(true, new SynchPrintChannelListener(_self) {
                private static final long serialVersionUID = -1990741944766989782L;

                public SynchChannel print(String msg) {
                    System.out.println(msg);
                    return null; // SynchChannel automatically created by JacobVPU
                }
            });
        }
    }

    public static final class Tester extends JacobRunnable {
        private static final long serialVersionUID = 7899682832271627464L;

        public void run() {
            final SynchPrintChannel p = newChannel(SynchPrintChannel.class);
            instance(new SystemPrinter(p));
            object(new SynchChannelListener(p.print("1")) {
                public void ret() {
                    object(new SynchChannelListener(p.print("2")) {
                        public void ret() {
                            object(new SynchChannelListener(p.print("3")) {
                                public void ret() {
                                }
                            });
                        }
                    });
                }
            });
        }
    }

    public static void main(String args[]) {
        JacobVPU vpu = new JacobVPU();
        vpu.setContext(new ExecutionQueueImpl(null));
        vpu.inject(new Tester());
        while (vpu.execute()) {
            // run
        }
    }

}