Package org.apache.hadoop.hbase.monitoring

Class MemoryBoundedLogMessageBuffer

java.lang.Object

org.apache.hadoop.hbase.monitoring.MemoryBoundedLogMessageBuffer

@Private
public class MemoryBoundedLogMessageBuffer
extends Object

A size-bounded repository of alerts, which are kept in a linked list. Alerts can be added, and they will automatically be removed one by one when the specified heap usage is exhausted.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	MemoryBoundedLogMessageBuffer.LogMessage

Field Summary

Fields

Modifier and Type	Field	Description
private final long	maxSizeBytes
private LinkedList<MemoryBoundedLogMessageBuffer.LogMessage>	messages
private long	usage

Constructor Summary

Constructors

Constructor	Description
MemoryBoundedLogMessageBuffer(long maxSizeBytes)

Method Summary

Modifier and Type	Method	Description
void	add(String messageText)	Append the given message to this buffer, automatically evicting older messages until the desired memory limit is achieved.
void	dumpTo(PrintWriter out)	Dump the contents of the buffer to the given stream.
(package private) long	estimateHeapUsage()	Estimate the number of bytes this buffer is currently using.
(package private) List<MemoryBoundedLogMessageBuffer.LogMessage>	getMessages()

Methods inherited from class java.lang.Object

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

Field Details

maxSizeBytes

private final long maxSizeBytes

usage

private long usage

messages

private LinkedList<MemoryBoundedLogMessageBuffer.LogMessage> messages

Constructor Details

MemoryBoundedLogMessageBuffer

public MemoryBoundedLogMessageBuffer(long maxSizeBytes)

Method Details

add

public void add(String messageText)

Append the given message to this buffer, automatically evicting older messages until the desired memory limit is achieved.

dumpTo

public void dumpTo(PrintWriter out)

Dump the contents of the buffer to the given stream.

getMessages

List<MemoryBoundedLogMessageBuffer.LogMessage> getMessages()

estimateHeapUsage

long estimateHeapUsage()

Estimate the number of bytes this buffer is currently using.