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/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.com>
*
* 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.orbekk.util;
import java.util.concurrent.CountDownLatch;
public class DelayedOperation {
public static class Status {
public final static int OK = 1;
public final static int CONFLICT = 2;
public final static int ERROR = 3;
private int status;
private String message;
public static Status createOk() {
return new Status(OK, "");
}
public static Status createConflict(String message) {
return new Status(CONFLICT, message);
}
public static Status createError(String message) {
return new Status(ERROR, message);
}
public Status(int status, String message) {
this.status = status;
this.message = message;
}
public boolean isOk() {
return status == OK;
}
public int getStatusCode() {
return status;
}
public String getMessage() {
return message;
}
@Override public String toString() {
switch(status) {
case OK:
return "OK";
case CONFLICT:
return "Conflicting update: " + message;
case ERROR:
return "Error: " + message;
}
throw new AssertionError("Unhandled case.");
}
@Override public boolean equals(Object other) {
if (!(other instanceof Status)) {
return false;
}
Status o = (Status)other;
if (o.status != this.status) {
return false;
}
if (message == null) {
return o.message == null;
}
return message.equals(o.message);
}
}
private volatile Status status;
private volatile int identifier;
private final CountDownLatch done = new CountDownLatch(1);
public DelayedOperation() {
}
public Status getStatus() {
waitFor();
return status;
}
public void waitFor() {
try {
done.await();
} catch (InterruptedException e) {
complete(new Status(Status.ERROR, "Thread interrupted."));
Thread.currentThread().interrupt();
}
}
public synchronized boolean isDone() {
return done.getCount() <= 0;
}
public synchronized void complete(Status status) {
this.status = status;
done.countDown();
}
public synchronized int getIdentifier() {
return identifier;
}
public synchronized void setIdentifier(int identifier) {
this.identifier = identifier;
}
}
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