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(Java) Async SFTP Progress Info

Demonstrates checking for progress info updates when running a task asynchronously. This example demonstrates an SFTP download.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  All Chilkat classes can be unlocked at once at the beginning of a program
    //  by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        System.out.println(chilkatGlob.lastErrorText());
        return;
        }

    CkSFtp sftp = new CkSFtp();

    //  Set some timeouts, in milliseconds:
    sftp.put_ConnectTimeoutMs(15000);
    sftp.put_IdleTimeoutMs(15000);

    //  Connect to the SSH server.
    //  The standard SSH port = 22
    //  The hostname may be a hostname or IP address.
    String hostname = "www.my-ssh-server.com";
    int port = 22;
    success = sftp.Connect(hostname,port);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    //  Authenticate with the SSH server.  Chilkat SFTP supports
    //  both password-based authenication as well as public-key
    //  authentication.  This example uses password authenication.
    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    //  After authenticating, the SFTP subsystem must be initialized:
    success = sftp.InitializeSftp();
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    //  --------------------
    //  Download a file
    //  --------------------
    String localFilePath = "c:/temp/hamlet.xml";
    String remoteFilePath = "subdir1/subdir2/hamlet.xml";

    //  Call the async version of the DownloadFileByName method to return a task object.
    //  The task object is loaded, but is in the Inert state -- meaning it is
    //  not yet scheduled to run on Chilkat's background thread pool.
    CkTask task = sftp.DownloadFileByNameAsync(remoteFilePath,localFilePath);
    if (task == null ) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    //  Before starting the task, tell it to keep an in-memory log of what would've been
    //  ProgressInfo callbacks.
    task.put_KeepProgressLog(true);

    //  Schedule the task for running on the thread pool.  This changes the task's state
    //  from Inert to Live.
    success = task.Run();
    if (success != true) {
        System.out.println(task.lastErrorText());

        return;
        }

    //  The application is now free to do anything else
    //  while the file is being downloaded.

    //  For this example, we'll simply sleep and periodically
    //  check to see if the download is finished, and report the progress
    //  along the way.
    int curPctDone = 0;
    String name;
    String value;

    while (task.get_Finished() != true) {

        if (task.get_PercentDone() != curPctDone) {
            curPctDone = task.get_PercentDone();
            System.out.println(curPctDone + " percent done");
            }

        //  Check the progress info log.
        //  Emit any log entries..
        while ((task.get_ProgressLogSize() > 0)) {
            //  Get the 1st entry, emit it, and then remove it..
            name = task.progressInfoName(0);
            value = task.progressInfoValue(0);

            //  Entries reporting the received byte count will have the name "RcvByteCount"
            //  Entries reporting the current bytes-per-second will have the name "RcvBytesPerSec"

            System.out.println(name + ": " + value);
            task.RemoveProgressInfo(0);
            }

        //  Sleep 100 ms.
        task.SleepMs(100);

        }

    //  Just in case there are any remaining entries...
    while ((task.get_ProgressLogSize() > 0)) {
        //  Get the 1st entry, emit it, and then remove it..
        name = task.progressInfoName(0);
        value = task.progressInfoValue(0);
        System.out.println(name + ": " + value);
        task.RemoveProgressInfo(0);
        }

    //  A finished task could be one that was canceled, aborted, or truly finished.

    //  If the task was "canceled", it was canceled prior to actually starting.  This could
    //  happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
    //  background thread pool scheduler.

    //  If the task was "aborted", it indicates that it was canceled while running in a background thread.
    //  The ResultErrorText will likely indicate that the task was aborted.

    //  If the task "completed", then it ran to completion, but the actual success/failure of the method
    //  is determined by the result obtained via a GetResult* method.  (A "completed" task will
    //  have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
    //  been aborted or canceled:
    if (task.get_StatusInt() != 7) {
        System.out.println("Task did not complete.");
        System.out.println("task status: " + task.status());

        return;
        }

    //  The DownloadFileByName method returns a boolean.  Therefore, after the task is finished,
    //  we can get the boolean result by calling GetResultBool.  This is the return value had
    //  we called DownloadFileByName synchronously.
    success = task.GetResultBool();
    if (success != true) {
        //  The task's ResultErrorText contains what would have been in the LastErrorText property had
        //  the DownloadFileByName method been called synchronously.
        System.out.println(task.resultErrorText());
        }
    else {
        System.out.println("File downloaded asynchronously.");
        }
  }
}

 

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