ExtConnection.java :  » IDE-Eclipse » team » org » eclipse » team » internal » ccvs » core » connection » Java Open Source

/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.ccvs.core.connection;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.internal.ccvs.core.ICVSRepositoryLocation;
import org.eclipse.team.internal.ccvs.core.IServerConnection;
import org.eclipse.team.internal.ccvs.core.util.Util;
import org.eclipse.team.internal.core.streams.PollingInputStream;
import org.eclipse.team.internal.core.streams.PollingOutputStream;
import org.eclipse.team.internal.core.streams.TimeoutInputStream;
import org.eclipse.team.internal.core.streams.TimeoutOutputStream;

/**
 * Implements a connection method which invokes an external tool to 
 * establish the connection to the cvs server. Authentication and starting
 * of the cvs server are the responsibility of the external connection
 * tool.
 */
public class ExtConnection implements IServerConnection {

  // cvs format for the repository (e.g. :extssh:user@host:/home/cvs/repo)
  private ICVSRepositoryLocation location;
  private String password;

  // incoming from remote host
  InputStream inputStream;

  // outgoing to remote host
  OutputStream outputStream;
  
  // Process spawn to run the command
  Process process;
  
  protected ExtConnection(ICVSRepositoryLocation location, String password) {
    this.location = location;
    this.password = password;
  }
  
  /**
   * Closes the connection.
   */
  public void close() throws IOException {
    try {
      if (inputStream != null) inputStream.close();
    } finally {
      inputStream = null;
      try {
        if (outputStream != null) outputStream.close();
      } finally {
        outputStream = null;
        if (process != null) process.destroy();
      }
    }
  }
  
  /**
   * Returns the <code>InputStream</code> used to read data from the
   * server.
   */
  public InputStream getInputStream() {
    return inputStream;
  }
  
  /**
   * Returns the <code>OutputStream</code> used to send data to the
   * server.
   */
  public OutputStream getOutputStream() {
    return outputStream;
  }
  
  /**
   * Opens the connection and invokes cvs in server mode.
   *
   * @see Connection.open()
   */
  public void open(IProgressMonitor monitor) throws IOException {
    String[] command = ((CVSRepositoryLocation)location).getExtCommand(password);
    boolean connected = false;
    try {
      process = Util.createProcess(command, monitor);

      inputStream = new PollingInputStream(new TimeoutInputStream(process.getInputStream(),
        8192 /*bufferSize*/, 1000 /*readTimeout*/, -1 /*closeTimeout*/), location.getTimeout(), monitor);
      outputStream = new PollingOutputStream(new TimeoutOutputStream(process.getOutputStream(),
        8192 /*buffersize*/, 1000 /*writeTimeout*/, 1000 /*closeTimeout*/), location.getTimeout(), monitor);

      // XXX need to do something more useful with stderr
      connected = true;
    } finally {
      if (! connected) {
        try {
          close();
        } finally {
          // Ignore any exceptions during close
        }
      }
    }
  }
}