com.iorga.webappwatcher.analyzer.ws.statistics.DailyStatisticsWS.java Source code

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Here is the source code for com.iorga.webappwatcher.analyzer.ws.statistics.DailyStatisticsWS.java

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/*
 * Copyright (C) 2013 Iorga Group
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/].
 */
package com.iorga.webappwatcher.analyzer.ws.statistics;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.StreamingOutput;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;

import com.iorga.webappwatcher.analyzer.model.session.DurationPerPrincipalStats;
import com.iorga.webappwatcher.analyzer.model.session.DurationPerPrincipalStats.DayStatistic;

@Path("/statistics/dailyStatistics")
public class DailyStatisticsWS {
    private static ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    @Inject
    private DurationPerPrincipalStats durationPerPrincipalStats;

    @GET
    @Path("/compute")
    public StreamingOutput compute() throws ClassNotFoundException, IOException {
        final List<DayStatistic> computeDayStatistics = durationPerPrincipalStats.computeDayStatistics();
        return new StreamingOutput() {
            @Override
            public void write(final OutputStream output) throws IOException, WebApplicationException {
                final JsonGenerator generator = OBJECT_MAPPER.getJsonFactory().createJsonGenerator(output,
                        JsonEncoding.UTF8);
                generator.writeStartArray();
                for (final DayStatistic dayStatistic : computeDayStatistics) {
                    generator.writeStartObject();
                    generator.writeFieldName("startDate");
                    OBJECT_MAPPER.writeValue(generator, dayStatistic.getStartDate());
                    generator.writeFieldName("endDate");
                    OBJECT_MAPPER.writeValue(generator, dayStatistic.getEndDate());
                    generator.writeArrayFieldStart("statistics");
                    // write each statistic
                    for (final String statisticType : new String[] { "distinctUsers", "numberOfRequests",
                            "durationsFor1clickSum", "durationsFor1clickMean", "durationsFor1clickMedian",
                            "durationsFor1click90c", "durationsFor1clickMin", "durationsFor1clickMax" }) {
                        //                  generator.writeFieldName(statisticType);
                        generator.writeStartObject();
                        generator.writeStringField("type", statisticType);
                        // get the statistics from the dayStatistic
                        DescriptiveStatistics descriptiveStatistics;
                        try {
                            descriptiveStatistics = (DescriptiveStatistics) dayStatistic.getClass()
                                    .getMethod("get" + StringUtils.capitalize(statisticType)).invoke(dayStatistic);
                        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
                                | NoSuchMethodException | SecurityException e) {
                            throw new IOException(
                                    "Problem while invoking getter for statisticType " + statisticType, e);
                        }
                        generator.writeNumberField("min", descriptiveStatistics.getMin());
                        generator.writeNumberField("max", descriptiveStatistics.getMax());
                        generator.writeNumberField("mean", descriptiveStatistics.getMean());
                        generator.writeNumberField("median", descriptiveStatistics.getPercentile(50));
                        generator.writeEndObject();
                    }
                    generator.writeEndArray();
                    generator.writeFieldName("distinctPrincipalsSize");
                    OBJECT_MAPPER.writeValue(generator, dayStatistic.getPrincipals().size());
                    generator.writeEndObject();
                }
                generator.writeEndArray();

                generator.flush(); // required else all the stream is not sent
            }
        };
    }
}