com.facebook.concurrency.CallableSnapshot Maven / Gradle / Ivy
/*
* Copyright (C) 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.concurrency;
import java.util.concurrent.Callable;
import com.facebook.util.exceptions.ExceptionHandler;
public class CallableSnapshot {
private V value = null;
private E exception = null;
private CallableSnapshot(E exception) {
this.exception = exception;
}
public CallableSnapshot(
Callable callable, ExceptionHandler exceptionHandler
) {
try {
value = callable.call();
} catch (Exception e) {
exception = exceptionHandler.handle(e);
}
}
public static CallableSnapshot createWithException(E exception) {
return new CallableSnapshot<>(exception);
}
public V get() throws E {
if (exception != null) {
throw exception;
}
return value;
}
public E getException() {
return exception;
}
}