ConnectedPVCountForAppliance.java

/*******************************************************************************
 * Copyright (c) 2011 The Board of Trustees of the Leland Stanford Junior University
 * as Operator of the SLAC National Accelerator Laboratory.
 * Copyright (c) 2011 Brookhaven National Laboratory.
 * EPICS archiver appliance is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 *******************************************************************************/
package org.epics.archiverappliance.engine.bpl.reports;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.epics.archiverappliance.common.BPLAction;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.engine.epics.EngineMetrics;
import org.epics.archiverappliance.utils.ui.MimeTypeConstants;
import org.json.simple.JSONObject;

/**
 * Return connected/disconnected/paused PV counts as a JSON object.
 * Used for internal purposes
 * @author mshankar
 *
 */
public class ConnectedPVCountForAppliance implements BPLAction {

	@Override
	public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService) throws IOException {
		resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
		try (PrintWriter out = resp.getWriter()) {
			EngineMetrics engineMetrics = EngineMetrics.computeEngineMetrics(configService.getEngineContext(), configService);
			HashMap<String, String> ret = new HashMap<String, String>();
			ret.put("total", Integer.toString(engineMetrics.getPvCount()));
			ret.put("connected", Integer.toString(engineMetrics.getConnectedPVCount()));
			ret.put("disconnected", Integer.toString(engineMetrics.getDisconnectedPVCount()));
			ret.put("paused", Integer.toString(engineMetrics.getPausedPVCount()));
			out.println(JSONObject.toJSONString(ret));
		}
	}

}