org.apache.streams.monitoring.persist.impl.BroadcastMessagePersister.java Source code

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Here is the source code for org.apache.streams.monitoring.persist.impl.BroadcastMessagePersister.java

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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
 *
 *   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;
    }
}