/*
 * 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.
 */

/**
 * @author Vitaly A. Provodin
 */

/**
 * Created on 31.01.2005
 */
package org.apache.harmony.jpda.tests.share;

import java.io.FileReader;
import java.io.StreamTokenizer;

/**
 * The class extends <code>Debuggee</code> and adds usage of the
 * synchronization channel implemented by <code>JPDADebuggeeSynchronizer</code>.
 */
public abstract class SyncDebuggee extends Debuggee {

    /**
     * An instance of JPDA debugger-debuggee synchronizer.
     */
    public JPDADebuggeeSynchronizer synchronizer;

    public String getPid() {
        try {
          StreamTokenizer toks = new StreamTokenizer(new FileReader("/proc/self/stat"));
          toks.parseNumbers();
          if (toks.nextToken() != StreamTokenizer.TT_NUMBER) {
            System.out.println("Failed to tokenize /proc/self/stat correctly. " +
                               "First token isn't a number");
            return "-1";
          }
          return Integer.toString((int)toks.nval);
        } catch (Exception e) {
            System.out.println("Failed to get pid! " + e);
            e.printStackTrace(System.out);
            return "-1";
        }
    }

    /**
     * Initializes the synchronization channel.
     */
    @Override
    public void onStart() {
        super.onStart();
        synchronizer = createSynchronizer();
        synchronizer.startClient();
        synchronizer.sendMessage(getPid());
    }

    /**
     * Creates wrapper for synchronization channel.
     */
    protected JPDADebuggeeSynchronizer createSynchronizer() {
        return new JPDADebuggeeSynchronizer(logWriter, settings);
    }

    /**
     * Terminates the synchronization channel.
     */
    @Override
    public void onFinish() {
        if (synchronizer != null) {
            synchronizer.stop();
        }
        super.onFinish();
    }
}