GetStoresForPV.java

package org.epics.archiverappliance.mgmt.bpl;

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

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

import org.apache.log4j.Logger;
import org.epics.archiverappliance.StoragePlugin;
import org.epics.archiverappliance.common.BPLAction;
import org.epics.archiverappliance.config.ConfigService;
import org.epics.archiverappliance.config.PVTypeInfo;
import org.epics.archiverappliance.config.StoragePluginURLParser;
import org.epics.archiverappliance.utils.ui.MimeTypeConstants;
import org.json.simple.JSONValue;

/**
 * Gets the names of the data stores for this PV.
 * 
 * @epics.BPLAction - Gets the names of the data stores for this PV. Every store in a PV's typeinfo is expected to have a name - this is typically "name=STS" or something similar. This call returns the names of all the stores for a PV.
 * @epics.BPLActionParam pv - The name of the pv.
 * @epics.BPLActionEnd
 * @author mshankar
 *
 */
public class GetStoresForPV implements BPLAction {
	private static Logger logger = Logger.getLogger(GetStoresForPV.class.getName());

	@Override
	public void execute(HttpServletRequest req, HttpServletResponse resp, ConfigService configService) throws IOException {
		String pvName = req.getParameter("pv");
		logger.debug("Getting typeinfo for PV " + pvName);
		if(pvName == null || pvName.equals("")) {
			resp.sendError(HttpServletResponse.SC_NOT_FOUND);
			return;
		}
		
		// String pvNameFromRequest = pvName;
		String realName = configService.getRealNameForAlias(pvName);
		if(realName != null) pvName = realName;

		PVTypeInfo typeInfo = configService.getTypeInfoForPV(pvName);
		if(typeInfo == null) {
			logger.warn("Cannot find typeinfo for " + pvName);
			resp.sendError(HttpServletResponse.SC_NOT_FOUND);
			return;
		}
		resp.setContentType(MimeTypeConstants.APPLICATION_JSON);
		try (PrintWriter out = resp.getWriter()) {
			LinkedList<String> stores = new LinkedList<String>();
			for(String store : typeInfo.getDataStores()) {
				StoragePlugin plugin = StoragePluginURLParser.parseStoragePlugin(store, configService);
				stores.add(plugin.getName());
			}
			out.println(JSONValue.toJSONString(stores));
		} catch(Exception ex) {
			logger.error("Exception marshalling typeinfo for pv " + pvName, ex);
			resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
		}
	}
}