Package org.apache.tomcat.jdbc.pool

Class FairBlockingQueue.ItemFuture<T>

java.lang.Object

org.apache.tomcat.jdbc.pool.FairBlockingQueue.ItemFuture<T>

Type Parameters:

T - the type of the item

All Implemented Interfaces:

java.util.concurrent.Future<T>

Enclosing class:

FairBlockingQueue<E>

protected class FairBlockingQueue.ItemFuture<T>
extends java.lang.Object
implements java.util.concurrent.Future<T>

A non-cancellable future used to check if a connection has been made available.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	canceled	Whether this future has been cancelled.
protected T	item	The item directly available in the future.
protected FairBlockingQueue.ExchangeCountDownLatch<T>	latch	The latch used to wait for an item.

Constructor Summary

Constructors

Constructor	Description
ItemFuture(FairBlockingQueue.ExchangeCountDownLatch<T> latch)	Creates an ItemFuture that waits on the given latch.
ItemFuture(T item)	Creates an ItemFuture with the given item already available.

Method Summary

Modifier and Type	Method	Description
boolean	cancel(boolean mayInterruptIfRunning)
T	get()
T	get(long timeout, java.util.concurrent.TimeUnit unit)
boolean	isCancelled()
boolean	isDone()

Methods inherited from class java.lang.Object

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

Field Detail

item

protected volatile T item

The item directly available in the future.

latch

protected volatile FairBlockingQueue.ExchangeCountDownLatch<T> latch

The latch used to wait for an item.

canceled

protected volatile boolean canceled

Whether this future has been cancelled.

Constructor Detail

ItemFuture

public ItemFuture(T item)

Creates an ItemFuture with the given item already available.

Parameters:

item - the item

ItemFuture

public ItemFuture(FairBlockingQueue.ExchangeCountDownLatch<T> latch)

Creates an ItemFuture that waits on the given latch.

Parameters:

latch - the latch to wait on

Method Detail

cancel

public boolean cancel(boolean mayInterruptIfRunning)

Specified by:

cancel in interface java.util.concurrent.Future<T>

get

public T get()
      throws java.lang.InterruptedException,
             java.util.concurrent.ExecutionException

Specified by:

get in interface java.util.concurrent.Future<T>

Throws:

java.lang.InterruptedException

java.util.concurrent.ExecutionException

get

public T get(long timeout,
             java.util.concurrent.TimeUnit unit)
      throws java.lang.InterruptedException,
             java.util.concurrent.ExecutionException,
             java.util.concurrent.TimeoutException

Specified by:

get in interface java.util.concurrent.Future<T>

Throws:

java.lang.InterruptedException

java.util.concurrent.ExecutionException

java.util.concurrent.TimeoutException

isCancelled

public boolean isCancelled()

Specified by:

isCancelled in interface java.util.concurrent.Future<T>

isDone

public boolean isDone()

Specified by:

isDone in interface java.util.concurrent.Future<T>