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LogGraph is an application for viewing and filtering zookeeper logs. It can handle transaction logs and message logs.

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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.zookeeper.graph.servlets;

import com.fasterxml.jackson.core.util.MinimalPrettyPrinter;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.apache.zookeeper.graph.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NumEvents extends JsonServlet
{
    private static final Logger LOG = LoggerFactory.getLogger(NumEvents.class);
    private static final int DEFAULT_PERIOD = 1000;

    private LogSource source = null;

    public NumEvents(LogSource src) throws Exception {
		this.source = src;
    }

    String handleRequest(JsonRequest request) throws Exception {
		String output = "";

		long starttime = 0;
		long endtime = 0;
		long period = 0;

		starttime = request.getNumber("start", 0);
		endtime = request.getNumber("end", 0);
		period = request.getNumber("period", 0);

		if (starttime == 0) { starttime = source.getStartTime(); }
		if (endtime == 0) {
	 	   if (period > 0) {
				endtime = starttime + period;
	 	   }
	 	   else {
				endtime = source.getEndTime();
	 	   }
		}

		long size = 0;
		LogIterator iter = source.iterator(starttime, endtime);
		size = iter.size();

		ObjectMapper mapper = new ObjectMapper();
		JsonNode data = mapper.createObjectNode();
		((ObjectNode) data).put("startTime", starttime);
		((ObjectNode) data).put("endTime", endtime);
		((ObjectNode) data).put("numEntries",  iter.size());

		if (LOG.isDebugEnabled()) {
		    LOG.debug("handle(start= " + starttime + ", end=" + endtime + ", numEntries=" + size +")");
		}
		iter.close();

		String jsonString = mapper.writer(new MinimalPrettyPrinter()).writeValueAsString(data);
		return jsonString;
    }
}