org.apache.jackrabbit.oak.segment

Class SegmentBufferMonitor

java.lang.Object

org.apache.jackrabbit.oak.segment.SegmentBufferMonitor

public class SegmentBufferMonitor
extends Object

This class exposes CounterStats for allocations and de-allocations of Buffer instances:

• DIRECT_BUFFER_COUNT: number of allocated direct byte buffers.
• DIRECT_BUFFER_CAPACITY: total capacity of the allocated direct byte buffers.
• HEAP_BUFFER_COUNT: number of allocated heap byte buffers.
• HEAP_BUFFER_CAPACITY: total capacity of the allocated heap byte buffers.

Users of this class call trackAllocation(Buffer) to update above statistics.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DIRECT_BUFFER_CAPACITY Total capacity of the allocated direct byte buffers.
static String	DIRECT_BUFFER_COUNT Number of allocated direct byte buffers
static String	HEAP_BUFFER_CAPACITY Total capacity of the allocated heap byte buffers.
static String	HEAP_BUFFER_COUNT Number of allocated heap byte buffers

Constructor Summary

Constructors

Constructor and Description
SegmentBufferMonitor(@NotNull StatisticsProvider statisticsProvider) Create a new instance using the passed statisticsProvider to expose buffer allocations.

Method Summary

Modifier and Type	Method and Description
void	trackAllocation(@NotNull Buffer buffer) Track the allocation of a buffer and update the exposed statistics.

Methods inherited from class java.lang.Object

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

Field Detail

DIRECT_BUFFER_COUNT

public static final String DIRECT_BUFFER_COUNT

Number of allocated direct byte buffers

See Also:

Constant Field Values

DIRECT_BUFFER_CAPACITY

public static final String DIRECT_BUFFER_CAPACITY

Total capacity of the allocated direct byte buffers.

See Also:

Constant Field Values

HEAP_BUFFER_COUNT

public static final String HEAP_BUFFER_COUNT

Number of allocated heap byte buffers

See Also:

Constant Field Values

HEAP_BUFFER_CAPACITY

public static final String HEAP_BUFFER_CAPACITY

Total capacity of the allocated heap byte buffers.

See Also:

Constant Field Values

Constructor Detail

SegmentBufferMonitor

public SegmentBufferMonitor(@NotNull
                            @NotNull StatisticsProvider statisticsProvider)

Create a new instance using the passed statisticsProvider to expose buffer allocations.

Parameters:

statisticsProvider -

Method Detail

trackAllocation

public void trackAllocation(@NotNull
                            @NotNull Buffer buffer)

Track the allocation of a buffer and update the exposed statistics.

Parameters:

buffer -