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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.ibm.mqlight.api.impl;
import com.ibm.mqlight.api.CompletionListener;
import com.ibm.mqlight.api.Promise;
import com.ibm.mqlight.api.StateException;
import com.ibm.mqlight.api.callback.CallbackService;
import com.ibm.mqlight.api.impl.callback.CallbackPromiseImpl;
import com.ibm.mqlight.api.logging.Logger;
import com.ibm.mqlight.api.logging.LoggerFactory;
public class CompletionFuture implements Promise {
private static final Logger logger = LoggerFactory.getLogger(CompletionFuture.class);
private boolean complete = false;
private final NonBlockingClientImpl client;
private CompletionListener listener;
private T context;
private Exception cause = null;
public CompletionFuture(NonBlockingClientImpl client) {
final String methodName = "";
logger.entry(this, methodName, client);
this.client = client;
logger.exit(this, methodName);
}
public void setSuccess(T result) throws IllegalStateException {
final String methodName = "postSuccess";
logger.entry(this, methodName, result);
final CompletionListener l;
final T c;
synchronized(this) {
if (complete) {
final IllegalStateException ex = new IllegalStateException("Promise already completed");
logger.throwing(this, methodName, ex);
throw ex;
}
complete = true;
l = listener;
c = context;
}
if (l != null) {
client.run(new Runnable() {
public void run() {
l.onSuccess(client, c);
}
}, client, new CallbackPromiseImpl(client, true));
}
logger.exit(this, methodName);
}
public void setFailure(final Exception exception) throws IllegalStateException {
final String methodName = "postFailure";
logger.entry(this, methodName, exception);
this.cause = exception;
final CompletionListener l;
final T c;
synchronized(this) {
if (complete) {
final IllegalStateException ex = new IllegalStateException("Promise already completed");
logger.throwing(this, methodName, ex);
throw ex;
}
complete = true;
l = listener;
c = context;
}
if (l != null) {
client.run(new Runnable() {
public void run() {
l.onError(client, c, cause);
}
}, client, new CallbackPromiseImpl(client, true));
}
logger.exit(this, methodName);
}
public void setListener(CallbackService callbackService, final CompletionListener listener, final T context) throws StateException {
final String methodName = "setListener";
logger.entry(this, methodName, callbackService, listener, context);
boolean callCallback = false;
synchronized(this) {
if (!complete) {
this.listener = listener;
this.context = context;
} else {
callCallback = true;
}
}
if (callCallback) {
if ( cause != null) {
if (cause instanceof StateException) throw (StateException)cause;
else if (listener != null) {
callbackService.run(new Runnable() {
public void run() {
listener.onError(client, context, cause);
}
}, client, new CallbackPromiseImpl(client, true));
}
} else if (listener != null) {
callbackService.run(new Runnable() {
public void run() {
listener.onSuccess(client, context);
}
}, client, new CallbackPromiseImpl(client, true));
}
}
logger.exit(this, methodName);
}
@Override
public synchronized boolean isComplete() {
return complete;
}
}
