Java tutorial
/** * Copyright 2013, Big Switch Networks, Inc. * * 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. **/ package net.floodlightcontroller.loadbalancer; import java.io.IOException; import java.util.Collection; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonToken; import com.fasterxml.jackson.databind.MappingJsonFactory; import org.restlet.resource.Delete; import org.restlet.resource.Get; import org.restlet.resource.Post; import org.restlet.resource.Put; import org.restlet.resource.ServerResource; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class MonitorsResource extends ServerResource { protected static Logger log = LoggerFactory.getLogger(MonitorsResource.class); @Get("json") public Collection<LBMonitor> retrieve() { ILoadBalancerService lbs = (ILoadBalancerService) getContext().getAttributes() .get(ILoadBalancerService.class.getCanonicalName()); String monitorId = (String) getRequestAttributes().get("monitor"); if (monitorId != null) return lbs.listMonitor(monitorId); else return lbs.listMonitors(); } @Put @Post public LBMonitor createMonitor(String postData) { LBMonitor monitor = null; try { monitor = jsonToMonitor(postData); } catch (IOException e) { log.error("Could not parse JSON {}", e.getMessage()); } ILoadBalancerService lbs = (ILoadBalancerService) getContext().getAttributes() .get(ILoadBalancerService.class.getCanonicalName()); String monitorId = (String) getRequestAttributes().get("monitor"); if (monitorId != null) return lbs.updateMonitor(monitor); else return lbs.createMonitor(monitor); } @Delete public int removeMonitor() { String monitorId = (String) getRequestAttributes().get("monitor"); ILoadBalancerService lbs = (ILoadBalancerService) getContext().getAttributes() .get(ILoadBalancerService.class.getCanonicalName()); return lbs.removeMonitor(monitorId); } protected LBMonitor jsonToMonitor(String json) throws IOException { MappingJsonFactory f = new MappingJsonFactory(); JsonParser jp; LBMonitor monitor = new LBMonitor(); try { jp = f.createJsonParser(json); } catch (JsonParseException e) { throw new IOException(e); } jp.nextToken(); if (jp.getCurrentToken() != JsonToken.START_OBJECT) { throw new IOException("Expected START_OBJECT"); } while (jp.nextToken() != JsonToken.END_OBJECT) { if (jp.getCurrentToken() != JsonToken.FIELD_NAME) { throw new IOException("Expected FIELD_NAME"); } String n = jp.getCurrentName(); jp.nextToken(); if (jp.getText().equals("")) continue; else if (n.equals("monitor")) { while (jp.nextToken() != JsonToken.END_OBJECT) { String field = jp.getCurrentName(); if (field.equals("id")) { monitor.id = jp.getText(); continue; } if (field.equals("name")) { monitor.name = jp.getText(); continue; } if (field.equals("type")) { monitor.type = Short.parseShort(jp.getText()); continue; } if (field.equals("delay")) { monitor.delay = Short.parseShort(jp.getText()); continue; } if (field.equals("timeout")) { monitor.timeout = Short.parseShort(jp.getText()); continue; } if (field.equals("attempts_before_deactivation")) { monitor.attemptsBeforeDeactivation = Short.parseShort(jp.getText()); continue; } if (field.equals("network_id")) { monitor.netId = jp.getText(); continue; } if (field.equals("address")) { monitor.address = Integer.parseInt(jp.getText()); continue; } if (field.equals("protocol")) { monitor.protocol = Byte.parseByte(jp.getText()); continue; } if (field.equals("port")) { monitor.port = Short.parseShort(jp.getText()); continue; } if (field.equals("admin_state")) { monitor.adminState = Short.parseShort(jp.getText()); continue; } if (field.equals("status")) { monitor.status = Short.parseShort(jp.getText()); continue; } log.warn("Unrecognized field {} in " + "parsing Vips", jp.getText()); } } } jp.close(); return monitor; } }