/*
* 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
*
* 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.streams.monitoring.persist.impl;
import org.apache.streams.monitoring.persist.MessagePersister;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
public class BroadcastMessagePersister implements MessagePersister {
private static final Logger LOGGER = LoggerFactory.getLogger(BroadcastMessagePersister.class);
private String broadcastUri;
public BroadcastMessagePersister(String broadcastUri) {
this.broadcastUri = broadcastUri;
}
@Override
/*
* Given a list of messages as Strings, broadcast them to the broadcastUri
* (if one is defined)
* @param messages
* @return int status code from POST response
*/
public int persistMessages(List<String> messages) {
int responseCode = -1;
if (broadcastUri != null) {
try {
HttpClient client = HttpClients.createDefault();
HttpPost post = new HttpPost(broadcastUri);
post.setHeader("User-Agent", "Streams");
List<NameValuePair> urlParameters = new ArrayList<>();
urlParameters.add(new BasicNameValuePair("messages", serializeMessages(messages)));
post.setEntity(new UrlEncodedFormEntity(urlParameters, "UTF-8"));
HttpResponse response = client.execute(post);
responseCode = response.getStatusLine().getStatusCode();
LOGGER.debug("Broadcast {} messages to URI: {}", messages.size(), broadcastUri);
} catch (Exception ex) {
LOGGER.error("Failed to broadcast message to URI: {}, exception: {}", broadcastUri, ex);
}
}
return responseCode;
}
/**
* Given a List of String messages, convert them to a JSON array.
* @param messages List of String messages
* @return Serialized version of this JSON array
*/
private String serializeMessages(List<String> messages) {
String ser = "{\"messages\":[";
for (String message : messages) {
if (messages.get(messages.size() - 1).equals(message)) {
ser += message + "]}";
} else {
ser += message + ",";
}
}
return ser;
}
}