OneMeasurement.java

/**                                                                                                                                                                                
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.                                                                                                                             
 *                                                                                                                                                                                 
 * 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                                                                                                                                             
 *                                                                                                                                                                                 
 * 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. See accompanying                                                                                                                 
 * LICENSE file.                                                                                                                                                                   
 */

package com.couchbase.loadgen.measurements;

import java.io.IOException;
import java.io.Serializable;

import org.codehaus.jackson.JsonParser;

import com.couchbase.loadgen.JsonStringBuilder;
import com.couchbase.loadgen.measurements.exporter.MeasurementsExporter;

/**
 * A single measured metric (such as READ LATENCY)
 */
public abstract class OneMeasurement implements Serializable {
	private static final long serialVersionUID = 7807865821392650553L;
	
	String _name;
	
	public String getName() {
		return _name;
	}

	/**
	 * @param _name
	 */
	public OneMeasurement(String _name) {
		this._name = _name;
	}

	public abstract void reportReturnCode(int code);

	public abstract void measure(int latency);
			
	public abstract String getSummary();
	
	public abstract void encodeJson(JsonStringBuilder builder);
	
	public abstract void decodeJson(JsonParser p);

	/**
	 * Export the current measurements to a suitable format.
	 * 
	 * @param exporter
	 *            Exporter representing the type of format to write to.
	 * @throws IOException
	 *             Thrown if the export failed.
	 */
	public abstract void exportMeasurements(MeasurementsExporter exporter)
			throws IOException;
	
	public String computeTime(double time) {
		int i;
		for (i = 0; time >= 1000 && i < 2; i++)
			time = time / 1000;
		
		time = Math.round(time * 100) / 100.0;
		if (i == 0)
			return String.format("%-6s", (Double.toString(time) + "us"));
		else if (i == 1)
			return String.format("%-6s", (Double.toString(time) + "ms"));
		else
			return String.format("%-6s", (Double.toString(time) + "s"));
		
	}
	
	public String computeTime(int time) {
		int i;
		for (i = 0; time >= 1000 && i < 2; i++)
			time = time / 1000;
		
		if (i == 0)
			return String.format("%-6s", (Integer.toString(time) + "us"));
		else if (i == 1)
			return String.format("%-6s", (Integer.toString(time) + "ms"));
		else
			return String.format("%-6s", (Integer.toString(time) + "s"));
		
	}
}