org.apache.hadoop.chukwa.datacollection.agent

Class NonBlockingMemLimitQueue

java.lang.Object

org.apache.hadoop.chukwa.datacollection.agent.NonBlockingMemLimitQueue

All Implemented Interfaces:

ChunkQueue, ChunkReceiver

public class NonBlockingMemLimitQueue
extends Object
implements ChunkQueue

An event queue that discards incoming chunks once a fixed upper limit of data is enqueued. The method calling add will not block. For now, uses the size of the data field. Should really use estimatedSerializedSize()?

Constructor Summary

Constructors

Constructor and Description
NonBlockingMemLimitQueue(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
void	add(Chunk chunk) Add a chunk to the queue, blocking if queue is full.
void	collect(List<Chunk> events, int maxSize) Return at least one, and no more than count, Chunks into chunks.
int	size() Return an approximation of the number of chunks in the queue currently.

Methods inherited from class java.lang.Object

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

Constructor Detail

NonBlockingMemLimitQueue

public NonBlockingMemLimitQueue(org.apache.hadoop.conf.Configuration conf)

Method Detail

add

public void add(Chunk chunk)
         throws InterruptedException

Description copied from interface: ChunkQueue

Add a chunk to the queue, blocking if queue is full.

Specified by:

add in interface ChunkQueue

Specified by:

add in interface ChunkReceiver

Parameters:

chunk - A binary blob

Throws:

InterruptedException - if thread is interrupted while blocking

See Also:

ChunkQueue.add(org.apache.hadoop.chukwa.Chunk)

collect

public void collect(List<Chunk> events,
                    int maxSize)
             throws InterruptedException

Description copied from interface: ChunkQueue

Return at least one, and no more than count, Chunks into chunks. Blocks if queue is empty.

Specified by:

collect in interface ChunkQueue

Parameters:

events - List of binary blobs

maxSize - maximum number of chunk to return

Throws:

InterruptedException - if thread is interrupted while collecting

See Also:

ChunkQueue.collect(java.util.List, int)

size

public int size()

Description copied from interface: ChunkQueue

Return an approximation of the number of chunks in the queue currently. No guarantees are made about the accuracy of this number.

Specified by:

size in interface ChunkQueue

Returns:

number of chunks in the queue currently