com.oracle.tools.deferred.DeferredCallable Maven / Gradle / Ivy
/*
* File: DeferredCallable.java
*
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*
* The contents of this file are subject to the terms and conditions of
* the Common Development and Distribution License 1.0 (the "License").
*
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the License by consulting the LICENSE.txt file
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*
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* file and include the License file LICENSE.txt.
*
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*/
package com.oracle.tools.deferred;
import java.util.concurrent.Callable;
/**
* A {@link Deferred} representation of the {@link Callable}.
*
* Copyright (c) 2014. All Rights Reserved. Oracle Corporation.
* Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
*
* @author Brian Oliver
*/
public class DeferredCallable implements Deferred
{
/**
* The {@link Callable} to be called.
*/
private Callable callable;
/**
* The type of value produced by the {@link Callable}.
*/
private Class deferredClass;
/**
* Constructs a {@link DeferredCallable}.
*
* @param callable the {@link Callable}
* @param deferredClass the type of the value produced by the {@link Callable}
*/
public DeferredCallable(Callable callable,
Class deferredClass)
{
this.callable = callable;
this.deferredClass = deferredClass;
}
@Override
public T get() throws TemporarilyUnavailableException, PermanentlyUnavailableException
{
try
{
return callable.call();
}
catch (Exception e)
{
// any exception means the callable can't produce a value
throw new PermanentlyUnavailableException(this, e);
}
}
@Override
public Class getDeferredClass()
{
return deferredClass;
}
}