Java tutorial
/* * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 edu.nwpu.gemfire.monitor.service; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.List; import javax.servlet.http.HttpServletRequest; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import edu.nwpu.gemfire.monitor.data.Cluster; import edu.nwpu.gemfire.monitor.data.Cluster.RegionOnMember; import edu.nwpu.gemfire.monitor.data.Repository; import edu.nwpu.gemfire.monitor.log.PulseLogWriter; /** * Class ClusterSelectedRegionsMemberService * * This class contains implementations of getting Cluster's selected region's member specific details * for all members in that region * * @author Riya Bhandekar * @since version 7.5 cedar 2014-03-01 */ @Component @Service("ClusterSelectedRegionsMember") @Scope("singleton") public class ClusterSelectedRegionsMemberService implements PulseService { private final ObjectMapper mapper = new ObjectMapper(); //Comparator based upon regions entry count private static Comparator<Cluster.RegionOnMember> romEntryCountComparator = (m1, m2) -> { long m1EntryCount = m1.getEntryCount(); long m2EntryCount = m2.getEntryCount(); if (m1EntryCount < m2EntryCount) { return -1; } else if (m1EntryCount > m2EntryCount) { return 1; } else { return 0; } }; @Override public ObjectNode execute(final HttpServletRequest request) throws Exception { PulseLogWriter LOGGER = PulseLogWriter.getLogger(); String userName = request.getUserPrincipal().getName(); String pulseData = request.getParameter("pulseData"); JsonNode parameterMap = mapper.readTree(pulseData); String selectedRegionFullPath = parameterMap.get("ClusterSelectedRegionsMember").get("regionFullPath") .textValue(); LOGGER.finest("ClusterSelectedRegionsMemberService selectedRegionFullPath = " + selectedRegionFullPath); // get cluster object Cluster cluster = Repository.get().getCluster(); // json object to be sent as response ObjectNode responseJSON = mapper.createObjectNode(); // getting cluster's Regions responseJSON.put("clusterName", cluster.getServerName()); responseJSON.put("userName", userName); responseJSON.put("selectedRegionsMembers", getSelectedRegionsMembersJson(cluster, selectedRegionFullPath)); // Send json response return responseJSON; } /** * Create JSON for selected cluster region's all members */ private ObjectNode getSelectedRegionsMembersJson(Cluster cluster, String selectedRegionFullPath) { PulseLogWriter LOGGER = PulseLogWriter.getLogger(); Cluster.Region reg = cluster.getClusterRegion(selectedRegionFullPath); if (reg != null) { ObjectNode regionMemberJSON = mapper.createObjectNode(); RegionOnMember[] regionOnMembers = reg.getRegionOnMembers(); //sort on entry count List<RegionOnMember> romList = Arrays.asList(regionOnMembers); Collections.sort(romList, romEntryCountComparator); for (RegionOnMember rom : romList) { ObjectNode memberJSON = mapper.createObjectNode(); memberJSON.put("memberName", rom.getMemberName()); memberJSON.put("regionFullPath", rom.getRegionFullPath()); memberJSON.put("entryCount", rom.getEntryCount()); memberJSON.put("entrySize", rom.getEntrySize()); memberJSON.put("accessor", ((rom.getLocalMaxMemory() == 0) ? "True" : "False")); LOGGER.finest("calling getSelectedRegionsMembersJson :: rom.getLocalMaxMemory() = " + rom.getLocalMaxMemory()); memberJSON.put("memoryReadsTrend", mapper.<JsonNode>valueToTree(rom .getRegionOnMemberStatisticTrend(RegionOnMember.REGION_ON_MEMBER_STAT_GETS_PER_SEC_TREND))); LOGGER.finest("memoryReadsTrend = " + rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_GETS_PER_SEC_TREND).length); memberJSON.put("memoryWritesTrend", mapper.<JsonNode>valueToTree(rom .getRegionOnMemberStatisticTrend(RegionOnMember.REGION_ON_MEMBER_STAT_PUTS_PER_SEC_TREND))); LOGGER.finest("memoryWritesTrend = " + rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_PUTS_PER_SEC_TREND).length); memberJSON.put("diskReadsTrend", mapper.<JsonNode>valueToTree(rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_DISK_READS_PER_SEC_TREND))); LOGGER.finest("diskReadsTrend = " + rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_DISK_READS_PER_SEC_TREND).length); memberJSON.put("diskWritesTrend", mapper.<JsonNode>valueToTree(rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_DISK_WRITES_PER_SEC_TREND))); LOGGER.finest("diskWritesTrend = " + rom.getRegionOnMemberStatisticTrend( RegionOnMember.REGION_ON_MEMBER_STAT_DISK_WRITES_PER_SEC_TREND).length); regionMemberJSON.put(rom.getMemberName(), memberJSON); } LOGGER.fine("calling getSelectedRegionsMembersJson :: regionJSON = " + regionMemberJSON); return regionMemberJSON; } else { ObjectNode responseJSON = mapper.createObjectNode(); responseJSON.put("errorOnRegion", "Region [" + selectedRegionFullPath + "] is not available"); return responseJSON; } } }