com.google.common.util.concurrent
Class FakeTimeLimiter

java.lang.Object
  com.google.common.util.concurrent.FakeTimeLimiter

All Implemented Interfaces:

TimeLimiter

public class FakeTimeLimiter
extends Object
implements TimeLimiter

A TimeLimiter implementation which actually does not attempt to limit time at all. This may be desirable to use in some unit tests. More importantly, attempting to debug a call which is time-limited would be extremely annoying, so this gives you a time-limiter you can easily swap in for your real time-limiter while you're debugging.

Since:

2009.09.15 tentative

Author:

Kevin Bourrillion

Constructor Summary

FakeTimeLimiter()

Method Summary

<T> T	callWithTimeout(Callable<T> callable, long timeoutDuration, TimeUnit timeoutUnit, boolean amInterruptible) Invokes a specified Callable, timing out after the specified time limit.
<T> T	newProxy(T target, Class<T> interfaceType, long timeoutDuration, TimeUnit timeoutUnit) Returns an instance of interfaceType that delegates all method calls to the target object, enforcing the specified time limit on each call.

Methods inherited from class java.lang.Object

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

Constructor Detail

FakeTimeLimiter

public FakeTimeLimiter()

Method Detail

newProxy

public <T> T newProxy(T target,
                      Class<T> interfaceType,
                      long timeoutDuration,
                      TimeUnit timeoutUnit)

Description copied from interface: TimeLimiter

Returns an instance of interfaceType that delegates all method calls to the target object, enforcing the specified time limit on each call. This time-limited delegation is also performed for calls to Object.equals(java.lang.Object), Object.hashCode(), and Object.toString().

If the target method call finishes before the limit is reached, the return value or exception is propagated to the caller exactly as-is. If, on the other hand, the time limit is reached, the proxy will attempt to abort the call to the target, and will throw an UncheckedTimeoutException to the caller.

It is important to note that the primary purpose of the proxy object is to return control to the caller when the timeout elapses; aborting the target method call is of secondary concern. The particular nature and strength of the guarantees made by the proxy is implementation-dependent. However, it is important that each of the methods on the target object behaves appropriately when its thread is interrupted.

Specified by:

newProxy in interface TimeLimiter

Parameters:

target - the object to proxy

interfaceType - the interface you wish the returned proxy to implement

timeoutDuration - with timeoutUnit, the maximum length of time that callers are willing to wait on each method call to the proxy

timeoutUnit - with timeoutDuration, the maximum length of time that callers are willing to wait on each method call to the proxy

Returns:

a time-limiting proxy

callWithTimeout

public <T> T callWithTimeout(Callable<T> callable,
                             long timeoutDuration,
                             TimeUnit timeoutUnit,
                             boolean amInterruptible)
                  throws Exception

Description copied from interface: TimeLimiter

Invokes a specified Callable, timing out after the specified time limit. If the target method call finished before the limit is reached, the return value or exception is propagated to the caller exactly as-is. If, on the other hand, the time limit is reached, we attempt to abort the call to the target, and throw an UncheckedTimeoutException to the caller.

Warning: The future of this method is in doubt. It may be nuked, or changed significantly.

Specified by:

callWithTimeout in interface TimeLimiter

Parameters:

callable - the Callable to execute

timeoutDuration - with timeoutUnit, the maximum length of time to wait

timeoutUnit - with timeoutDuration, the maximum length of time to wait

amInterruptible - whether to respond to thread interruption by aborting the operation and throwing InterruptedException; if false, the operation is allowed to complete or time out, and the current thread's interrupt status is re-asserted.

Returns:

the result returned by the Callable

Throws:

InterruptedException - if interruptible is true and our thread is interrupted during execution

UncheckedTimeoutException - if the time limit is reached

Exception