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JSONMeasurementsExporter.java
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Fri, Jul 26, 12:15

JSONMeasurementsExporter.java
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/**
* Copyright (c) 2010-2016 Yahoo! Inc., 2017 YCSB contributors All rights reserved.
* <p>
* Licensed 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.measurements.exporter;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.util.DefaultPrettyPrinter;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
/**
* Export measurements into a machine readable JSON file.
*/
public class JSONMeasurementsExporter implements MeasurementsExporter {
private final JsonFactory factory = new JsonFactory();
private JsonGenerator g;
public JSONMeasurementsExporter(OutputStream os) throws IOException {
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os));
g = factory.createJsonGenerator(bw);
g.setPrettyPrinter(new DefaultPrettyPrinter());
}
public void write(String metric, String measurement, int i) throws IOException {
g.writeStartObject();
g.writeStringField("metric", metric);
g.writeStringField("measurement", measurement);
g.writeNumberField("value", i);
g.writeEndObject();
}
public void write(String metric, String measurement, long i) throws IOException {
g.writeStartObject();
g.writeStringField("metric", metric);
g.writeStringField("measurement", measurement);
g.writeNumberField("value", i);
g.writeEndObject();
}
public void write(String metric, String measurement, double d) throws IOException {
g.writeStartObject();
g.writeStringField("metric", metric);
g.writeStringField("measurement", measurement);
g.writeNumberField("value", d);
g.writeEndObject();
}
public void close() throws IOException {
if (g != null) {
g.close();
}
}
}

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