PausedPVsReport.java

package org.epics.archiverappliance.mgmt.bpl.reports;

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

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

import org.apache.log4j.Logger;
import org.epics.archiverappliance.common.BPLAction;
import org.epics.archiverappliance.common.TimeUtils;
import org.epics.archiverappliance.config.ApplianceInfo;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.config.PVTypeInfo;
import org.epics.archiverappliance.utils.ui.GetUrlContent;
import org.epics.archiverappliance.utils.ui.MimeTypeConstants;
import org.json.simple.JSONArray;

/**
 * Generate a report of PVs that are currently paused.
 * 
 * 
 * @epics.BPLAction - Return a list of PVs that are currently paused. 
 * @epics.BPLActionParam limit - Limit this report to this many PVs per appliance in the cluster. Optional, if unspecified, there are no limits enforced.
 * @epics.BPLActionEnd
 * 
 * @author mshankar
 *
 */
public class PausedPVsReport implements BPLAction {
	private static Logger logger = Logger.getLogger(PausedPVsReport.class.getName());
	@Override
	public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService) throws IOException {
		String limit = req.getParameter("limit");
		logger.info("Paused PVs report for " + (limit == null ? "default limit " : ("limit " + limit)));
		LinkedList<String> pausedPVForThisApplianceURLs = new LinkedList<String>();
		for(ApplianceInfo info : configService.getAppliancesInCluster()) {
			String mgmtURL = info.getMgmtURL();
			String pausedPVForThisApplianceURL = mgmtURL + "/getPausedPVsForThisAppliance" + (limit == null ? "" : ("?limit=" + limit));
			if(limit != null) {
				pausedPVForThisApplianceURL = pausedPVForThisApplianceURL + "?limit=" + limit;
			}
			pausedPVForThisApplianceURLs.add(pausedPVForThisApplianceURL);
		}
		
		JSONArray pausedPVs = GetUrlContent.combineJSONArrays(pausedPVForThisApplianceURLs);
		LinkedList<HashMap<String, String>> retVal = new LinkedList<HashMap<String, String>>();
		for(Object pausedPVObj : pausedPVs) { 
			String pvName = (String) pausedPVObj;
			HashMap<String, String> pvDetails = new HashMap<String, String>();
			pvDetails.put("pvName", pvName);
			PVTypeInfo typeInfo = configService.getTypeInfoForPV(pvName);
			pvDetails.put("instance", typeInfo.getApplianceIdentity());
			pvDetails.put("modificationTime", TimeUtils.convertToHumanReadableString(typeInfo.getModificationTime()));
			retVal.add(pvDetails);
		}
		
		resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
		try(PrintWriter out = resp.getWriter()) {
			out.println(JSONArray.toJSONString(retVal));
		}
	}
}