io.druid.collections

Class BlockingPool<T>

java.lang.Object

io.druid.collections.BlockingPool<T>

public class BlockingPool<T>
extends Object

Pool that pre-generates objects up to a limit, then permits possibly-blocking "take" operations.

Constructor Summary

Constructors

Constructor and Description
BlockingPool(com.google.common.base.Supplier<T> generator, int limit)

Method Summary

Modifier and Type	Method and Description
int	getPoolSize()
int	maxSize()
ReferenceCountingResourceHolder<T>	take() Take a resource from the pool, waiting if necessary until an element becomes available.
ReferenceCountingResourceHolder<T>	take(long timeoutMs) Take a resource from the pool, waiting up to the specified wait time if necessary for an element to become available.
ReferenceCountingResourceHolder<List<T>>	takeBatch(int elementNum) Take resources from the pool, waiting if necessary until the elements of the given number become available.
ReferenceCountingResourceHolder<List<T>>	takeBatch(int elementNum, long timeoutMs) Take resources from the pool, waiting up to the specified wait time if necessary for elements of the given number to become available.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockingPool

public BlockingPool(com.google.common.base.Supplier<T> generator,
                    int limit)

Method Detail

maxSize

public int maxSize()

getPoolSize

public int getPoolSize()

take

public ReferenceCountingResourceHolder<T> take(long timeoutMs)

Take a resource from the pool, waiting up to the specified wait time if necessary for an element to become available.

Parameters:

timeoutMs - maximum time to wait for a resource, in milliseconds.

Returns:

a resource, or null if the timeout was reached

take

public ReferenceCountingResourceHolder<T> take()

Take a resource from the pool, waiting if necessary until an element becomes available.

Returns:

a resource

takeBatch

public ReferenceCountingResourceHolder<List<T>> takeBatch(int elementNum,
                                                          long timeoutMs)

Take resources from the pool, waiting up to the specified wait time if necessary for elements of the given number to become available.

Parameters:

elementNum - number of resources to take

timeoutMs - maximum time to wait for resources, in milliseconds.

Returns:

a resource, or null if the timeout was reached

takeBatch

public ReferenceCountingResourceHolder<List<T>> takeBatch(int elementNum)

Take resources from the pool, waiting if necessary until the elements of the given number become available.

Parameters:

elementNum - number of resources to take

Returns:

a resource