GetAppliancesInCluster.java

package org.epics.archiverappliance.mgmt.bpl;

import java.io.IOException;
import java.io.PrintWriter;

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.config.ApplianceInfo;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.utils.ui.JSONEncoder;
import org.epics.archiverappliance.utils.ui.MimeTypeConstants;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

/**
 * 
 * @epics.BPLAction - Get the appliance information for all the appliances in the cluster that are active. 
 * @epics.BPLActionEnd
 * 
 * @author mshankar
 *
 */
public class GetAppliancesInCluster implements BPLAction {
	private static Logger logger = Logger.getLogger(GetAppliancesInCluster.class.getName());
	@SuppressWarnings("unchecked")
	@Override
	public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService) throws IOException {

		resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
		try (PrintWriter out = resp.getWriter()) {
			JSONArray retVal = new JSONArray();
			JSONEncoder<ApplianceInfo> jsonEncoder = JSONEncoder.getEncoder(ApplianceInfo.class);
			for(ApplianceInfo applianceInfo : configService.getAppliancesInCluster()) { 
				JSONObject output = jsonEncoder.encode(applianceInfo);
				retVal.add(output);
			}
			
			out.println(retVal.toJSONString());
		} catch(Exception ex) {
			logger.error("Exception returning appliances in cluster", ex);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
		}
	}
}