com.gpudb.filesystem.common

Class IoTask

java.lang.Object

com.gpudb.filesystem.common.IoTask

All Implemented Interfaces:

Callable<Result>

public class IoTask
extends Object
implements Callable<Result>

This is an internal class and not meant to be used by the end users of the filesystem API. The consequences of using this class directly in client code is not guaranteed and maybe undesirable. This class is only used for multi-part upload and download and an instance of this class is created only by FileUploader and FileDownloader classes. This class models a single background tasks running in a thread. It implements the Callable interface and the overridden call() method is the one that executes the main logic in this class. Depending on the value of the instance variable opMode it calls either the upload() or the download() method.

Constructor Summary

Constructors

Constructor and Description
IoTask(GPUdb db, String fileName, MultiPartDownloadInfo multiPartDownloadInfo, DownloadOptions options) Constructs a task for downloading a part of a multi-part download.
IoTask(GPUdb db, String fileName, MultiPartUploadInfo multiPartUploadInfo, UploadOptions options, long taskNumber, ByteBuffer dataBytes) Constructs a task for uploading a part of a multi-part upload.

Method Summary

Modifier and Type	Method and Description
Result	call() This method is called automatically the thread in which the current instance of this class runs.
MultiPartDownloadInfo	getMultiPartDownloadInfo()
MultiPartUploadInfo	getMultiPartUploadInfo()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IoTask

public IoTask(GPUdb db,
              String fileName,
              MultiPartUploadInfo multiPartUploadInfo,
              UploadOptions options,
              long taskNumber,
              ByteBuffer dataBytes)

Constructs a task for uploading a part of a multi-part upload.

Parameters:

db - The GPUdb instance used to access KiFS.

fileName - Name of the file to be uploaded.

multiPartUploadInfo - Configuration information about this part of the upload as well as the overall upload itself.

options - Options to use during the upload.

taskNumber - Sequence number of this part of the overall upload.

dataBytes - Data to upload for this part, in a binary format.

IoTask

public IoTask(GPUdb db,
              String fileName,
              MultiPartDownloadInfo multiPartDownloadInfo,
              DownloadOptions options)

Constructs a task for downloading a part of a multi-part download.

Parameters:

db - The GPUdb instance used to access KiFS.

fileName - Name of the file to be downloaded.

multiPartDownloadInfo - Configuration information about this part of the download as well as the overall download itself.

options - Options to use during the download (reserved for future use).

Method Detail

call

public Result call()

This method is called automatically the thread in which the current instance of this class runs.

Specified by:

call in interface Callable<Result>

Returns:

The Result of the upload/download operation.

getMultiPartUploadInfo

public MultiPartUploadInfo getMultiPartUploadInfo()

getMultiPartDownloadInfo

public MultiPartDownloadInfo getMultiPartDownloadInfo()