io.prestosql.memory

Class MemoryPool

java.lang.Object

io.prestosql.memory.MemoryPool

public class MemoryPool
extends Object

Constructor Summary

Constructors

Constructor and Description
MemoryPool(MemoryPoolId id, io.airlift.units.DataSize size)

Method Summary

Modifier and Type	Method and Description
void	addListener(MemoryPoolListener listener)
void	free(QueryId queryId, String allocationTag, long bytes)
void	freeRevocable(QueryId queryId, long bytes)
long	getFreeBytes() Returns the number of free bytes.
MemoryPoolId	getId()
MemoryPoolInfo	getInfo()
long	getMaxBytes()
long	getReservedBytes()
long	getReservedRevocableBytes()
void	removeListener(MemoryPoolListener listener)
com.google.common.util.concurrent.ListenableFuture<?>	reserve(QueryId queryId, String allocationTag, long bytes) Reserves the given number of bytes.
com.google.common.util.concurrent.ListenableFuture<?>	reserveRevocable(QueryId queryId, long bytes)
String	toString()
boolean	tryReserve(QueryId queryId, String allocationTag, long bytes) Try to reserve the given number of bytes.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryPool

public MemoryPool(MemoryPoolId id,
                  io.airlift.units.DataSize size)

Method Detail

getId

public MemoryPoolId getId()

getInfo

public MemoryPoolInfo getInfo()

addListener

public void addListener(MemoryPoolListener listener)

removeListener

public void removeListener(MemoryPoolListener listener)

reserve

public com.google.common.util.concurrent.ListenableFuture<?> reserve(QueryId queryId,
                                                                     String allocationTag,
                                                                     long bytes)

Reserves the given number of bytes. Caller should wait on the returned future, before allocating more memory.

reserveRevocable

public com.google.common.util.concurrent.ListenableFuture<?> reserveRevocable(QueryId queryId,
                                                                              long bytes)

tryReserve

public boolean tryReserve(QueryId queryId,
                          String allocationTag,
                          long bytes)

Try to reserve the given number of bytes. Return value indicates whether the caller may use the requested memory.

free

public void free(QueryId queryId,
                 String allocationTag,
                 long bytes)

freeRevocable

public void freeRevocable(QueryId queryId,
                          long bytes)

getFreeBytes

public long getFreeBytes()

Returns the number of free bytes. This value may be negative, which indicates that the pool is over-committed.

getMaxBytes

public long getMaxBytes()

getReservedBytes

public long getReservedBytes()

getReservedRevocableBytes

public long getReservedRevocableBytes()

toString

public String toString()

Overrides:

toString in class Object