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package com.orbekk.util;
public class DelayedOperation<T> {
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;
}
@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 T argument;
private Status status;
private boolean isDone;
private int identifier;
public DelayedOperation(T argument) {
this.argument = argument;
}
public Status getStatus() {
waitFor();
return status;
}
public synchronized void waitFor() {
while (!isDone) {
try {
wait();
} catch (InterruptedException e) {
complete(new Status(Status.ERROR, "Thread interrupted."));
}
}
}
public synchronized boolean isDone() {
return isDone;
}
public synchronized void complete(Status status) {
if (!isDone) {
isDone = true;
this.status = status;
notifyAll();
}
}
public synchronized int getIdentifier() {
return identifier;
}
public synchronized void setIdentifier(int identifier) {
this.identifier = identifier;
}
}
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