org.h2.util

Class LazyFuture<T>

java.lang.Object

org.h2.util.LazyFuture<T>

Type Parameters:

T - the result type

All Implemented Interfaces:

java.util.concurrent.Future<T>

public abstract class LazyFuture<T>
extends java.lang.Object
implements java.util.concurrent.Future<T>

Single threaded lazy future.

Constructor Summary

Constructors

Constructor and Description
LazyFuture()

Method Summary

Modifier and Type	Method and Description
boolean	cancel(boolean mayInterruptIfRunning)
T	get()
T	get(long timeout, java.util.concurrent.TimeUnit unit)
boolean	isCancelled()
boolean	isDone()
boolean	reset() Reset this future to the initial state.
protected abstract T	run() Run computation and produce the result.

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyFuture

public LazyFuture()

Method Detail

reset

public boolean reset()

Reset this future to the initial state.

Returns:

false if it was already in initial state

run

protected abstract T run()
                  throws java.lang.Exception

Run computation and produce the result.

Returns:

the result of computation

Throws:

java.lang.Exception

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

Specified by:

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

Throws:

java.lang.InterruptedException

java.util.concurrent.ExecutionException

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>