Package org.apache.cassandra.io.util

Class LimitingRebufferer

java.lang.Object

org.apache.cassandra.io.util.WrappingRebufferer

org.apache.cassandra.io.util.LimitingRebufferer

All Implemented Interfaces:

AutoCloseable, ReaderFileProxy, Rebufferer, Rebufferer.BufferHolder

@NotThreadSafe
public class LimitingRebufferer
extends WrappingRebufferer

Rebufferer wrapper that applies rate limiting.

Instantiated once per RandomAccessReader, thread-unsafe. The instances reuse themselves as the BufferHolder to avoid having to return a new object for each rebuffer call. Only one BufferHolder can be active at a time. Calling rebuffer(long) before the previously obtained buffer holder is released will throw AssertionError.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.Rebufferer

Rebufferer.BufferHolder

Field Summary

Fields inherited from class org.apache.cassandra.io.util.WrappingRebufferer

buffer, bufferHolder, offset, wrapped

Fields inherited from interface org.apache.cassandra.io.util.Rebufferer

EMPTY

Constructor Summary

Constructors

Constructor	Description
LimitingRebufferer(Rebufferer wrapped, com.google.common.util.concurrent.RateLimiter limiter, int limitQuant)

Method Summary

Modifier and Type	Method	Description
Rebufferer.BufferHolder	rebuffer(long position)	Rebuffer (move on or seek to) a given position, and return a buffer that can be used there.
String	toString()

Methods inherited from class org.apache.cassandra.io.util.WrappingRebufferer

buffer, channel, close, closeReader, fileLength, getCrcCheckChance, offset, release

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.io.util.Rebufferer.BufferHolder

floatBuffer, intBuffer

Constructor Details

LimitingRebufferer

public LimitingRebufferer(Rebufferer wrapped,
 com.google.common.util.concurrent.RateLimiter limiter,
 int limitQuant)

Method Details

rebuffer

public Rebufferer.BufferHolder rebuffer(long position)

Description copied from interface: Rebufferer

Rebuffer (move on or seek to) a given position, and return a buffer that can be used there. The only guarantee about the size of the returned data is that unless rebuffering at the end of the file, the buffer will not be empty and will contain the requested position, i.e. offset <= position < offset + bh.buffer().limit(), but the buffer will not be positioned there.

Specified by:

rebuffer in interface Rebufferer

Overrides:

rebuffer in class WrappingRebufferer

toString

public String toString()

Overrides:

toString in class WrappingRebufferer