Package org.mapsforge.map.layer.hills

Class LatchedLazyFuture<X>

java.lang.Object

org.mapsforge.map.layer.hills.LatchedLazyFuture<X>

Type Parameters:

X - result type

All Implemented Interfaces:

java.util.concurrent.Future<X>

Direct Known Subclasses:

LazyFuture

public abstract class LatchedLazyFuture<X>
extends java.lang.Object
implements java.util.concurrent.Future<X>

A simple calculation future for cross-thread result sharing and optional eager parallelism via withRunningThread().

Constructor Summary

Constructors

Constructor	Description
LatchedLazyFuture()

Method Summary

Modifier and Type	Method	Description
protected abstract X	calculate()
boolean	cancel(boolean mayInterruptIfRunning)
X	get()
X	get(long timeout, java.util.concurrent.TimeUnit unit)
boolean	isCancelled()
boolean	isDone()
LatchedLazyFuture<X>	withRunningThread()	spawns a new thread if not already started or done (otherwise, calculation happens in the first get call)

Methods inherited from class java.lang.Object

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

Constructor Detail

LatchedLazyFuture

public LatchedLazyFuture()

Method Detail

cancel

public boolean cancel(boolean mayInterruptIfRunning)

Specified by:

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

isCancelled

public boolean isCancelled()

Specified by:

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

isDone

public boolean isDone()

Specified by:

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

get

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

Specified by:

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

Throws:

java.lang.InterruptedException

java.util.concurrent.ExecutionException

get

public X 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<X>

Throws:

java.lang.InterruptedException

java.util.concurrent.ExecutionException

java.util.concurrent.TimeoutException

calculate

protected abstract X calculate()
                        throws java.util.concurrent.ExecutionException,
                               java.lang.InterruptedException

Throws:

java.util.concurrent.ExecutionException

java.lang.InterruptedException

withRunningThread

public LatchedLazyFuture<X> withRunningThread()

spawns a new thread if not already started or done (otherwise, calculation happens in the first get call)

Returns:

this for chaining