org.webpda.server.core.servermessage.PingMessage.java Source code

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Here is the source code for org.webpda.server.core.servermessage.PingMessage.java

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/*******************************************************************************
 * Copyright (c) 2013 Oak Ridge National Laboratory.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/
package org.webpda.server.core.servermessage;

import java.io.ByteArrayOutputStream;
import java.util.logging.Level;

import org.webpda.server.core.Constants;
import org.webpda.server.core.util.LoggerUtil;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;

/**
 * A server message that pings the client.
 * 
 * @author Xihui Chen
 * 
 */
public class PingMessage extends NonPVEventMessage {

    private long count;

    public PingMessage(long pingCount) {
        this.count = pingCount;
    }

    @Override
    public String createJson() throws JsonProcessingException {
        try {
            JsonGenerator jg = createJsonGenerator();
            jg.writeNumberField("Count", count);

            jg.writeEndObject();
            jg.close();
            ByteArrayOutputStream outputStream = (ByteArrayOutputStream) jg.getOutputTarget();
            String s = outputStream.toString(Constants.CHARSET);
            outputStream.close();
            return s;
        } catch (Exception e) {
            LoggerUtil.getLogger().log(Level.SEVERE, "Failed to create json.", e);
        }

        return null;
    }

}