org.apache.blur.metrics.MetricInfo.java Source code

Introduction

Here is the source code for org.apache.blur.metrics.MetricInfo.java

Source

package org.apache.blur.metrics;

/**
 * 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.
 */
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import java.util.Map.Entry;

import org.jboss.netty.util.internal.ConcurrentHashMap;
import org.json.JSONException;
import org.json.JSONObject;

public class MetricInfo {

    public static void main(String[] args) throws IOException {
        MetricInfo info = new MetricInfo("name", "type", 10);
        info.addNumber("test1", 0.1);
        info.addNumber("test1", 0.2);
        info.addNumber("test1", 0.3);
        info.addNumber("test1", 0.4);
        info.addNumber("test1", 0.5);
        info.addNumber("test1", 0.6);
        info.addNumber("test1", 0.7);
        info.addNumber("test1", 0.9);
        info.addNumber("test1", 1.0);
        info.addNumber("test1", 1.1);
        info.addNumber("test1", 1.2);

        StringWriter writer = new StringWriter();
        info.write(writer);
        System.out.println(writer);
    }

    static interface ArrayWriter {
        void writeArray(Writer writer) throws IOException;
    }

    static class PrimitiveLongQueue implements ArrayWriter {
        int head = -1;
        int length = 0;
        final long[] data;
        final int numberOfElements;

        PrimitiveLongQueue(int numberOfElements) {
            this.data = new long[numberOfElements];
            this.numberOfElements = numberOfElements;
        }

        void add(long d) {
            head++;
            if (head >= numberOfElements) {
                head = 0;
            }
            data[head] = d;
            if (length < numberOfElements) {
                length++;
            }
        }

        public void writeArray(Writer writer) throws IOException {
            writer.append("[");
            int position = head;
            for (int i = 0; i < length; i++) {
                if (i != 0) {
                    writer.append(',');
                }
                writer.append(Long.toString(data[position]));
                position--;
                if (position < 0) {
                    position = numberOfElements - 1;
                }
            }
            writer.append("]");
        }
    }

    static class PrimitiveDoubleQueue implements ArrayWriter {
        int head = -1;
        int length = 0;
        final double[] data;
        final int numberOfElements;

        PrimitiveDoubleQueue(int numberOfElements) {
            this.data = new double[numberOfElements];
            this.numberOfElements = numberOfElements;
        }

        void add(double d) {
            head++;
            if (head >= numberOfElements) {
                head = 0;
            }
            data[head] = d;
            if (length < numberOfElements) {
                length++;
            }
        }

        public void writeArray(Writer writer) throws IOException {
            writer.append("[");
            int position = head;
            for (int i = 0; i < length; i++) {
                if (i != 0) {
                    writer.append(',');
                }
                double d = data[position];
                try {
                    writer.append(JSONObject.numberToString(d));
                } catch (JSONException e) {
                    throw new IOException(e);
                }
                position--;
                if (position < 0) {
                    position = numberOfElements - 1;
                }
            }
            writer.append("]");
        }
    }

    private final String name;
    private final String type;
    private final Map<String, ArrayWriter> metricMap = new ConcurrentHashMap<String, ArrayWriter>();
    private int numberOfEntries;

    public MetricInfo(String name, String type, int numberOfEntries) {
        this.name = name;
        this.type = type;
        this.numberOfEntries = numberOfEntries;
    }

    public void addNumber(String name, long l) {
        PrimitiveLongQueue queue = (PrimitiveLongQueue) metricMap.get(name);
        if (queue == null) {
            queue = new PrimitiveLongQueue(numberOfEntries);
            metricMap.put(name, queue);
        }
        queue.add(l);
    }

    public void addNumber(String name, double d) {
        PrimitiveDoubleQueue queue = (PrimitiveDoubleQueue) metricMap.get(name);
        if (queue == null) {
            queue = new PrimitiveDoubleQueue(numberOfEntries);
            metricMap.put(name, queue);
        }
        queue.add(d);
    }

    public void write(Writer writer) throws IOException {
        writer.append("{\"name\":\"");
        writer.append(name);
        writer.append("\",\"type\":\"");
        writer.append(type);
        writer.append("\",\"data\":{");
        writeMetricMap(writer);
        writer.append("}}");
    }

    private void writeMetricMap(Writer writer) throws IOException {
        boolean flag = false;
        for (Entry<String, ArrayWriter> entry : metricMap.entrySet()) {
            if (flag) {
                writer.append(',');
            }
            writer.append("\"");
            writer.append(entry.getKey());
            writer.append("\":");
            entry.getValue().writeArray(writer);
            flag = true;
        }
    }

    public void setMetaData(String key, String value) {

    }
}