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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 org.apache.tuscany.sca.binding.notification;
import java.io.OutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.axiom.om.OMElement;
import org.apache.tuscany.sca.binding.notification.encoding.BrokerID;
import org.apache.tuscany.sca.binding.notification.encoding.Constants;
import org.apache.tuscany.sca.binding.notification.encoding.EncodingUtils;
import org.apache.tuscany.sca.binding.notification.encoding.EndpointReference;
import org.apache.tuscany.sca.binding.notification.util.IOUtils;
import org.apache.tuscany.sca.binding.notification.util.IOUtils.IOUtilsException;
import org.apache.tuscany.sca.binding.notification.util.IOUtils.Writeable;
import org.apache.tuscany.sca.implementation.notification.ImmutableMessage;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
/**
* Turns invoke into remote message fan-out
*
* @version $Rev$ $Date$
*/
public class NotificationReferenceBindingInvoker implements Invoker {
private static final Message RESPONSE = new ImmutableMessage();
private Operation operation;
private List<SubscriberInfo> subscribers;
private String brokerID;
public NotificationReferenceBindingInvoker(Operation operation) {
this.operation = operation;
this.subscribers = new ArrayList<SubscriberInfo>();
this.brokerID = null;
}
public void setBrokerID(String brokerID) {
this.brokerID = brokerID;
}
public String getBrokerID() {
return brokerID;
}
public Message invoke(Message msg) {
Object payload = msg.getBody();
if (payload == null) {
throw new RuntimeException("Message body is null");
}
Writeable writeable = null;
String incomingBrokerID = null;
if (payload.getClass().isArray()) {
Object[] bodyArray = (Object[])payload;
if (bodyArray.length == 3) {
writeable = getWriteableFromByteArray((byte[])bodyArray[1]);
incomingBrokerID = (String)bodyArray[2];
}
else if (bodyArray.length == 1) {
writeable = getWriteableFromPayload(bodyArray[0]);
}
else {
throw new RuntimeException("Invalid body array size");
}
}
else {
writeable = getWriteableFromPayload(payload);
}
try {
synchronized(this) {
for (SubscriberInfo subscriber : subscribers) {
// check for each subscriber's broker id and skip if equal
if (incomingBrokerID != null && subscriber.brokerID != null && incomingBrokerID.equals(subscriber.brokerID)) {
continue;
}
HashMap<String, String> headers = new HashMap<String, String>();
headers.put(IOUtils.Notification_Operation, operation.getName());
if (brokerID != null) {
headers.put(Constants.Broker_ID, brokerID);
}
IOUtils.sendHttpRequest(subscriber.address, headers, writeable, null);
}
}
} catch(Exception e) {
e.printStackTrace();
throw new RuntimeException("Sender caught exception", e);
}
return RESPONSE;
}
private Writeable getWriteableFromPayload(Object payload) throws RuntimeException {
if (!(payload instanceof OMElement)) {
throw new RuntimeException("payload not OMElement");
}
final OMElement element = (OMElement)payload;
Writeable writeable = new Writeable() {
public void write(OutputStream os) throws IOUtilsException {
try {
element.serialize(os);
os.flush();
}
catch(Exception e) {
throw new IOUtilsException(e);
}
}
};
return writeable;
}
private Writeable getWriteableFromByteArray(final byte[] payload) {
Writeable writeable = new Writeable() {
public void write(OutputStream os) throws IOUtilsException {
try {
os.write(payload);
os.flush();
}
catch(Exception e) {
throw new IOUtilsException(e);
}
}
};
return writeable;
}
public void addSubscriberUrl(URL subscriberUrl) {
addSubscriber(subscriberUrl, null);
}
public void addSubscriber(EndpointReference subscriberEPR) {
BrokerID brokerID = null;
if (subscriberEPR.getReferenceProperties() != null) {
brokerID = subscriberEPR.getReferenceProperties().getProperty(BrokerID.class);
}
addSubscriber(subscriberEPR.getEndpointAddress().getAddress(), (brokerID != null ? brokerID.getID() : null));
}
public void addSubscriber(URL address, String brokerID) {
synchronized(this) {
SubscriberInfo si = new SubscriberInfo(address);
si.brokerID = brokerID;
if (subscribers == null) {
subscribers = new ArrayList<SubscriberInfo>();
}
subscribers.add(si);
}
}
public void replaceSubscribers(EndpointReference brokerConsumerEPR) {
synchronized(this) {
subscribers = null;
}
addSubscriber(brokerConsumerEPR);
}
public void replaceBrokerSubscriber(URL removedBrokerConsumerUrl, EndpointReference chosenBrokerConsumerEpr) {
synchronized(this) {
if (subscribers == null) {
throw new RuntimeException("No subscribers");
}
SubscriberInfo siToRemove = null;
for (SubscriberInfo si : subscribers) {
if (si.address.equals(removedBrokerConsumerUrl)) {
siToRemove = si;
}
}
if (siToRemove == null) {
throw new RuntimeException("Can't find info for broker to remove [" + removedBrokerConsumerUrl + "]");
}
if (!subscribers.remove(siToRemove)) {
throw new RuntimeException("Can't remove info for [" + siToRemove.address + "]");
}
}
if (chosenBrokerConsumerEpr != null) {
addSubscriber(chosenBrokerConsumerEpr);
}
}
public List<EndpointReference> getNeighborBrokerConsumerEprs() {
synchronized(this) {
if (subscribers == null) {
throw new RuntimeException("No subscribers");
}
List<EndpointReference> neighborBrokerConsumerEprs = new ArrayList<EndpointReference>();
for(SubscriberInfo si : subscribers) {
if (si.brokerID != null) {
neighborBrokerConsumerEprs.add(EncodingUtils.createEndpointReference(si.address, si.brokerID));
}
}
return neighborBrokerConsumerEprs;
}
}
public void removeBrokerSubscribers() {
synchronized(this) {
if (subscribers == null) {
throw new RuntimeException("No subscribers");
}
List<SubscriberInfo> sisToRemove = new ArrayList<SubscriberInfo>();
for (SubscriberInfo si : subscribers) {
if (si.brokerID != null) {
sisToRemove.add(si);
}
}
for(SubscriberInfo si : sisToRemove) {
if (!subscribers.remove(si)) {
throw new RuntimeException("Can't remove broker subscriber [" + si.address + "]");
}
}
}
}
class SubscriberInfo {
public URL address;
public String brokerID;
public SubscriberInfo(URL address) {
this.address = address;
this.brokerID = null;
}
}
}
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