org.apache.hadoop.hbase.monitoring

Class MemoryBoundedLogMessageBuffer

java.lang.Object

org.apache.hadoop.hbase.monitoring.MemoryBoundedLogMessageBuffer

@InterfaceAudience.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 and Description
private static class	MemoryBoundedLogMessageBuffer.LogMessage

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
MemoryBoundedLogMessageBuffer(long maxSizeBytes)

Method Summary

Modifier and Type	Method and 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 Detail

maxSizeBytes

private final long maxSizeBytes

usage

private long usage

messages

private LinkedList<MemoryBoundedLogMessageBuffer.LogMessage> messages

Constructor Detail

MemoryBoundedLogMessageBuffer

public MemoryBoundedLogMessageBuffer(long maxSizeBytes)

Method Detail

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.