io.druid.indexing.common.tasklogs

Class SwitchingTaskLogStreamer

java.lang.Object

io.druid.indexing.common.tasklogs.SwitchingTaskLogStreamer

All Implemented Interfaces:

TaskLogStreamer

public class SwitchingTaskLogStreamer
extends Object
implements TaskLogStreamer

Provides task logs based on a series of underlying task log providers.

Constructor Summary

Constructors

Constructor and Description
SwitchingTaskLogStreamer(List<TaskLogStreamer> providers)

Method Summary

Modifier and Type	Method and Description
com.google.common.base.Optional<com.google.common.io.ByteSource>	streamTaskLog(String taskid, long offset) Stream log for a task.

Methods inherited from class java.lang.Object

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

Constructor Detail

SwitchingTaskLogStreamer

@Inject
public SwitchingTaskLogStreamer(List<TaskLogStreamer> providers)

Method Detail

streamTaskLog

public com.google.common.base.Optional<com.google.common.io.ByteSource> streamTaskLog(String taskid,
                                                                                      long offset)
                                                                               throws IOException

Description copied from interface: TaskLogStreamer

Stream log for a task.

Specified by:

streamTaskLog in interface TaskLogStreamer

offset - If zero, stream the entire log. If positive, attempt to read from this position onwards. If negative, attempt to read this many bytes from the end of the file (like tail -n).

Returns:

input supplier for this log, if available from this provider

Throws:

IOException