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Ant example source code file (AbstractSshMessage.java)

This example Ant source code file (AbstractSshMessage.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

abstractsshmessage, abstractsshmessage, buildexception, buildexception, channelexec, channelsftp, io, ioexception, ioexception, jschexception, jschexception, loglistener, progressmonitor, string, stringbuffer, text

The AbstractSshMessage.java source code

/*
 *  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.tools.ant.taskdefs.optional.ssh;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.SftpProgressMonitor;

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

import org.apache.tools.ant.BuildException;

/**
 * Abstract class for ssh upload and download
 */
public abstract class AbstractSshMessage {

    private Session session;
    private boolean verbose;
    private LogListener listener = new LogListener() {
        public void log(String message) {
            // do nothing;
        }
    };

    /**
     * Constructor for AbstractSshMessage
     * @param session the ssh session to use
     */
    public AbstractSshMessage(Session session) {
        this(false, session);
    }

    /**
     * Constructor for AbstractSshMessage
     * @param verbose if true do verbose logging
     * @param session the ssh session to use
     * @since Ant 1.6.2
     */
    public AbstractSshMessage(boolean verbose, Session session) {
        this.verbose = verbose;
        this.session = session;
    }

    /**
     * Open an ssh channel.
     * @param command the command to use
     * @return the channel
     * @throws JSchException on error
     */
    protected Channel openExecChannel(String command) throws JSchException {
        ChannelExec channel = (ChannelExec) session.openChannel("exec");
        channel.setCommand(command);

        return channel;
    }

    /**
     * Open an ssh sftp channel.
     * @return the channel
     * @throws JSchException on error
     */
    protected ChannelSftp openSftpChannel() throws JSchException {
        ChannelSftp channel = (ChannelSftp) session.openChannel("sftp");

        return channel;
    }

    /**
     * Send an ack.
     * @param out the output stream to use
     * @throws IOException on error
     */
    protected void sendAck(OutputStream out) throws IOException {
        byte[] buf = new byte[1];
        buf[0] = 0;
        out.write(buf);
        out.flush();
    }

    /**
     * Reads the response, throws a BuildException if the response
     * indicates an error.
     * @param in the input stream to use
     * @throws IOException on I/O error
     * @throws BuildException on other errors
     */
    protected void waitForAck(InputStream in)
        throws IOException, BuildException {
        int b = in.read();

        // b may be 0 for success,
        //          1 for error,
        //          2 for fatal error,

        if (b == -1) {
            // didn't receive any response
            throw new BuildException("No response from server");
        } else if (b != 0) {
            StringBuffer sb = new StringBuffer();

            int c = in.read();
            while (c > 0 && c != '\n') {
                sb.append((char) c);
                c = in.read();
            }

            if (b == 1) {
                throw new BuildException("server indicated an error: "
                                         + sb.toString());
            } else if (b == 2) {
                throw new BuildException("server indicated a fatal error: "
                                         + sb.toString());
            } else {
                throw new BuildException("unknown response, code " + b
                                         + " message: " + sb.toString());
            }
        }
    }

    /**
     * Carry out the transfer.
     * @throws IOException on I/O errors
     * @throws JSchException on ssh errors
     */
    public abstract void execute() throws IOException, JSchException;

    /**
     * Set a log listener.
     * @param aListener the log listener
     */
    public void setLogListener(LogListener aListener) {
        listener = aListener;
    }

    /**
     * Log a message to the log listener.
     * @param message the message to log
     */
    protected void log(String message) {
        listener.log(message);
    }

    /**
     * Log transfer stats to the log listener.
     * @param timeStarted the time started
     * @param timeEnded   the finishing time
     * @param totalLength the total length
     */
    protected void logStats(long timeStarted,
                             long timeEnded,
                             long totalLength) {
        double duration = (timeEnded - timeStarted) / 1000.0;
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
        format.setMinimumFractionDigits(1);
        listener.log("File transfer time: " + format.format(duration)
            + " Average Rate: " + format.format(totalLength / duration)
            + " B/s");
    }

    /**
     * Is the verbose attribute set.
     * @return true if the verbose attribute is set
     * @since Ant 1.6.2
     */
    protected final boolean getVerbose() {
        return verbose;
    }

    /**
     * Track progress every 10% if 100kb < filesize < 1mb. For larger
     * files track progress for every percent transmitted.
     * @param filesize the size of the file been transmitted
     * @param totalLength the total transmission size
     * @param percentTransmitted the current percent transmitted
     * @return the percent that the file is of the total
     */
    protected final int trackProgress(long filesize, long totalLength,
                                      int percentTransmitted) {

        int percent = (int) Math.round(Math.floor((totalLength
                                                   / (double) filesize) * 100));

        if (percent > percentTransmitted) {
            if (filesize < 1048576) {
                if (percent % 10 == 0) {
                    if (percent == 100) {
                        System.out.println(" 100%");
                    } else {
                        System.out.print("*");
                    }
                }
            } else {
                if (percent == 50) {
                    System.out.println(" 50%");
                } else if (percent == 100) {
                    System.out.println(" 100%");
                } else {
                    System.out.print(".");
                }
            }
        }

        return percent;
    }

    private ProgressMonitor monitor = null;

    /**
     * Get the progress monitor.
     * @return the progress monitor.
     */
    protected SftpProgressMonitor getProgressMonitor() {
        if (monitor == null) {
            monitor = new ProgressMonitor();
        }
        return monitor;
    }

    private class ProgressMonitor implements SftpProgressMonitor {
        private long initFileSize = 0;
        private long totalLength = 0;
        private int percentTransmitted = 0;

        public void init(int op, String src, String dest, long max) {
            initFileSize = max;
            totalLength = 0;
            percentTransmitted = 0;
        }

        public boolean count(long len) {
            totalLength += len;
            percentTransmitted = trackProgress(initFileSize,
                                               totalLength,
                                               percentTransmitted);
            return true;
        }

        public void end() {
        }

        public long getTotalLength() {
            return totalLength;
        }
    }
}

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