ElasticSearch2.3.5源碼包結構截圖：

先看下node 這個類，sonar是調用node start 方法啟動的

/** Licensed to Elasticsearch under one or more contributor* license agreements. See the NOTICE file distributed with* this work for additional information regarding copyright* ownership. Elasticsearch 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 org.elasticsearch.node;import org.elasticsearch.Build; import org.elasticsearch.Version; import org.elasticsearch.action.ActionModule; import org.elasticsearch.cache.recycler.PageCacheRecycler; import org.elasticsearch.client.Client; import org.elasticsearch.client.node.NodeClientModule; import org.elasticsearch.cluster.ClusterModule; import org.elasticsearch.cluster.ClusterNameModule; import org.elasticsearch.cluster.ClusterService; import org.elasticsearch.cluster.action.index.MappingUpdatedAction; import org.elasticsearch.cluster.routing.RoutingService; import org.elasticsearch.common.StopWatch; import org.elasticsearch.common.component.Lifecycle; import org.elasticsearch.common.component.LifecycleComponent; import org.elasticsearch.common.inject.Injector; import org.elasticsearch.common.inject.Module; import org.elasticsearch.common.inject.ModulesBuilder; import org.elasticsearch.common.io.stream.NamedWriteableRegistry; import org.elasticsearch.common.lease.Releasable; import org.elasticsearch.common.lease.Releasables; import org.elasticsearch.common.logging.ESLogger; import org.elasticsearch.common.logging.Loggers; import org.elasticsearch.common.network.NetworkAddress; import org.elasticsearch.common.network.NetworkModule; import org.elasticsearch.common.settings.Settings; import org.elasticsearch.common.settings.SettingsModule; import org.elasticsearch.common.transport.BoundTransportAddress; import org.elasticsearch.common.transport.TransportAddress; import org.elasticsearch.discovery.Discovery; import org.elasticsearch.discovery.DiscoveryModule; import org.elasticsearch.discovery.DiscoveryService; import org.elasticsearch.env.Environment; import org.elasticsearch.env.EnvironmentModule; import org.elasticsearch.env.NodeEnvironment; import org.elasticsearch.env.NodeEnvironmentModule; import org.elasticsearch.gateway.GatewayAllocator; import org.elasticsearch.gateway.GatewayModule; import org.elasticsearch.gateway.GatewayService; import org.elasticsearch.http.HttpServer; import org.elasticsearch.http.HttpServerModule; import org.elasticsearch.http.HttpServerTransport; import org.elasticsearch.index.search.shape.ShapeModule; import org.elasticsearch.indices.IndicesModule; import org.elasticsearch.indices.IndicesService; import org.elasticsearch.indices.breaker.CircuitBreakerModule; import org.elasticsearch.indices.cache.query.IndicesQueryCache; import org.elasticsearch.indices.cluster.IndicesClusterStateService; import org.elasticsearch.indices.fielddata.cache.IndicesFieldDataCache; import org.elasticsearch.indices.memory.IndexingMemoryController; import org.elasticsearch.indices.store.IndicesStore; import org.elasticsearch.indices.ttl.IndicesTTLService; import org.elasticsearch.monitor.MonitorModule; import org.elasticsearch.monitor.MonitorService; import org.elasticsearch.monitor.jvm.JvmInfo; import org.elasticsearch.node.internal.InternalSettingsPreparer; import org.elasticsearch.node.settings.NodeSettingsService; import org.elasticsearch.percolator.PercolatorModule; import org.elasticsearch.percolator.PercolatorService; import org.elasticsearch.plugins.Plugin; import org.elasticsearch.plugins.PluginsModule; import org.elasticsearch.plugins.PluginsService; import org.elasticsearch.repositories.RepositoriesModule; import org.elasticsearch.rest.RestController; import org.elasticsearch.rest.RestModule; import org.elasticsearch.script.ScriptModule; import org.elasticsearch.script.ScriptService; import org.elasticsearch.search.SearchModule; import org.elasticsearch.search.SearchService; import org.elasticsearch.snapshots.SnapshotShardsService; import org.elasticsearch.snapshots.SnapshotsService; import org.elasticsearch.threadpool.ThreadPool; import org.elasticsearch.threadpool.ThreadPoolModule; import org.elasticsearch.transport.TransportModule; import org.elasticsearch.transport.TransportService; import org.elasticsearch.tribe.TribeModule; import org.elasticsearch.tribe.TribeService; import org.elasticsearch.watcher.ResourceWatcherModule; import org.elasticsearch.watcher.ResourceWatcherService;import java.io.BufferedWriter; import java.io.IOException; import java.net.Inet6Address; import java.net.InetAddress; import java.net.InetSocketAddress; import java.nio.charset.Charset; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.StandardCopyOption; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.concurrent.TimeUnit;import static org.elasticsearch.common.settings.Settings.settingsBuilder;/*** A node represent a node within a cluster (<tt>cluster.name</tt>). The {@link #client()} can be used* in order to use a {@link Client} to perform actions/operations against the cluster.* <p>In order to create a node, the {@link NodeBuilder} can be used. When done with it, make sure to* call {@link #close()} on it.*/ public class Node implements Releasable {private static final String CLIENT_TYPE = "node";public static final String HTTP_ENABLED = "http.enabled";private final Lifecycle lifecycle = new Lifecycle();private final Injector injector;private final Settings settings;private final Environment environment;private final PluginsService pluginsService;private final Client client;/*** Constructs a node with the given settings.** @param preparedSettings Base settings to configure the node with*/public Node(Settings preparedSettings) {this(InternalSettingsPreparer.prepareEnvironment(preparedSettings, null), Version.CURRENT, Collections.<Class<? extends Plugin>>emptyList());}protected Node(Environment tmpEnv, Version version, Collection<Class<? extends Plugin>> classpathPlugins) {Settings tmpSettings = settingsBuilder().put(tmpEnv.settings()).put(Client.CLIENT_TYPE_SETTING, CLIENT_TYPE).build();tmpSettings = TribeService.processSettings(tmpSettings);ESLogger logger = Loggers.getLogger(Node.class, tmpSettings.get("name"));logger.info("version[{}], pid[{}], build[{}/{}]", version, JvmInfo.jvmInfo().pid(), Build.CURRENT.hashShort(), Build.CURRENT.timestamp());logger.info("initializing ...");if (logger.isDebugEnabled()) {logger.debug("using config [{}], data [{}], logs [{}], plugins [{}]",tmpEnv.configFile(), Arrays.toString(tmpEnv.dataFiles()), tmpEnv.logsFile(), tmpEnv.pluginsFile());}this.pluginsService = new PluginsService(tmpSettings, tmpEnv.modulesFile(), tmpEnv.pluginsFile(), classpathPlugins);this.settings = pluginsService.updatedSettings();// create the environment based on the finalized (processed) view of the settingsthis.environment = new Environment(this.settings());final NodeEnvironment nodeEnvironment;try {nodeEnvironment = new NodeEnvironment(this.settings, this.environment);} catch (IOException ex) {throw new IllegalStateException("Failed to created node environment", ex);}final ThreadPool threadPool = new ThreadPool(settings);NamedWriteableRegistry namedWriteableRegistry = new NamedWriteableRegistry();boolean success = false;try {ModulesBuilder modules = new ModulesBuilder();modules.add(new Version.Module(version));modules.add(new CircuitBreakerModule(settings));// plugin modules must be added here, before others or we can get crazy injection errors...for (Module pluginModule : pluginsService.nodeModules()) {modules.add(pluginModule);}modules.add(new PluginsModule(pluginsService));modules.add(new SettingsModule(this.settings));modules.add(new NodeModule(this));modules.add(new NetworkModule(namedWriteableRegistry));modules.add(new ScriptModule(this.settings));modules.add(new EnvironmentModule(environment));modules.add(new NodeEnvironmentModule(nodeEnvironment));modules.add(new ClusterNameModule(this.settings));modules.add(new ThreadPoolModule(threadPool));modules.add(new DiscoveryModule(this.settings));modules.add(new ClusterModule(this.settings));modules.add(new RestModule(this.settings));modules.add(new TransportModule(settings, namedWriteableRegistry));if (settings.getAsBoolean(HTTP_ENABLED, true)) {modules.add(new HttpServerModule(settings));}modules.add(new IndicesModule());modules.add(new SearchModule());modules.add(new ActionModule(false));modules.add(new MonitorModule(settings));modules.add(new GatewayModule(settings));modules.add(new NodeClientModule());modules.add(new ShapeModule());modules.add(new PercolatorModule());modules.add(new ResourceWatcherModule());modules.add(new RepositoriesModule());modules.add(new TribeModule());pluginsService.processModules(modules);injector = modules.createInjector();client = injector.getInstance(Client.class);threadPool.setNodeSettingsService(injector.getInstance(NodeSettingsService.class));success = true;} finally {if (!success) {nodeEnvironment.close();ThreadPool.terminate(threadPool, 10, TimeUnit.SECONDS);}}logger.info("initialized");}/*** The settings that were used to create the node.*/public Settings settings() {return this.settings;}/*** A client that can be used to execute actions (operations) against the cluster.*/public Client client() {return client;}/*** Start the node. If the node is already started, this method is no-op.*/public Node start() {if (!lifecycle.moveToStarted()) {return this;}ESLogger logger = Loggers.getLogger(Node.class, settings.get("name"));logger.info("starting ...");// hack around dependency injection problem (for now...)injector.getInstance(Discovery.class).setRoutingService(injector.getInstance(RoutingService.class));for (Class<? extends LifecycleComponent> plugin : pluginsService.nodeServices()) {injector.getInstance(plugin).start();}injector.getInstance(MappingUpdatedAction.class).setClient(client);injector.getInstance(IndicesService.class).start();injector.getInstance(IndexingMemoryController.class).start();injector.getInstance(IndicesClusterStateService.class).start();injector.getInstance(IndicesTTLService.class).start();injector.getInstance(SnapshotsService.class).start();injector.getInstance(SnapshotShardsService.class).start();injector.getInstance(RoutingService.class).start();injector.getInstance(SearchService.class).start();injector.getInstance(MonitorService.class).start();injector.getInstance(RestController.class).start();// TODO hack around circular dependencies problemsinjector.getInstance(GatewayAllocator.class).setReallocation(injector.getInstance(ClusterService.class), injector.getInstance(RoutingService.class));injector.getInstance(ResourceWatcherService.class).start();injector.getInstance(GatewayService.class).start();// Start the transport service now so the publish address will be added to the local disco node in ClusterServiceTransportService transportService = injector.getInstance(TransportService.class);transportService.start();injector.getInstance(ClusterService.class).start();// start after cluster service so the local disco is knownDiscoveryService discoService = injector.getInstance(DiscoveryService.class).start();transportService.acceptIncomingRequests();discoService.joinClusterAndWaitForInitialState();if (settings.getAsBoolean("http.enabled", true)) {injector.getInstance(HttpServer.class).start();}injector.getInstance(TribeService.class).start();if (settings.getAsBoolean("node.portsfile", false)) {if (settings.getAsBoolean("http.enabled", true)) {HttpServerTransport http = injector.getInstance(HttpServerTransport.class);writePortsFile("http", http.boundAddress());}TransportService transport = injector.getInstance(TransportService.class);writePortsFile("transport", transport.boundAddress());}logger.info("started");return this;}private Node stop() {if (!lifecycle.moveToStopped()) {return this;}ESLogger logger = Loggers.getLogger(Node.class, settings.get("name"));logger.info("stopping ...");injector.getInstance(TribeService.class).stop();injector.getInstance(ResourceWatcherService.class).stop();if (settings.getAsBoolean("http.enabled", true)) {injector.getInstance(HttpServer.class).stop();}injector.getInstance(SnapshotsService.class).stop();injector.getInstance(SnapshotShardsService.class).stop();// stop any changes happening as a result of cluster state changesinjector.getInstance(IndicesClusterStateService.class).stop();// we close indices first, so operations won't be allowed on itinjector.getInstance(IndexingMemoryController.class).stop();injector.getInstance(IndicesTTLService.class).stop();injector.getInstance(RoutingService.class).stop();injector.getInstance(ClusterService.class).stop();injector.getInstance(DiscoveryService.class).stop();injector.getInstance(MonitorService.class).stop();injector.getInstance(GatewayService.class).stop();injector.getInstance(SearchService.class).stop();injector.getInstance(RestController.class).stop();injector.getInstance(TransportService.class).stop();for (Class<? extends LifecycleComponent> plugin : pluginsService.nodeServices()) {injector.getInstance(plugin).stop();}// we should stop this last since it waits for resources to get released// if we had scroll searchers etc or recovery going on we wait for to finish.injector.getInstance(IndicesService.class).stop();logger.info("stopped");return this;}// During concurrent close() calls we want to make sure that all of them return after the node has completed it's shutdown cycle.// If not, the hook that is added in Bootstrap#setup() will be useless: close() might not be executed, in case another (for example api) call// to close() has already set some lifecycles to stopped. In this case the process will be terminated even if the first call to close() has not finished yet.@Overridepublic synchronized void close() {if (lifecycle.started()) {stop();}if (!lifecycle.moveToClosed()) {return;}ESLogger logger = Loggers.getLogger(Node.class, settings.get("name"));logger.info("closing ...");StopWatch stopWatch = new StopWatch("node_close");stopWatch.start("tribe");injector.getInstance(TribeService.class).close();stopWatch.stop().start("http");if (settings.getAsBoolean("http.enabled", true)) {injector.getInstance(HttpServer.class).close();}stopWatch.stop().start("snapshot_service");injector.getInstance(SnapshotsService.class).close();injector.getInstance(SnapshotShardsService.class).close();stopWatch.stop().start("client");Releasables.close(injector.getInstance(Client.class));stopWatch.stop().start("indices_cluster");injector.getInstance(IndicesClusterStateService.class).close();stopWatch.stop().start("indices");injector.getInstance(IndexingMemoryController.class).close();injector.getInstance(IndicesTTLService.class).close();injector.getInstance(IndicesService.class).close();// close filter/fielddata caches after indicesinjector.getInstance(IndicesQueryCache.class).close();injector.getInstance(IndicesFieldDataCache.class).close();injector.getInstance(IndicesStore.class).close();stopWatch.stop().start("routing");injector.getInstance(RoutingService.class).close();stopWatch.stop().start("cluster");injector.getInstance(ClusterService.class).close();stopWatch.stop().start("discovery");injector.getInstance(DiscoveryService.class).close();stopWatch.stop().start("monitor");injector.getInstance(MonitorService.class).close();stopWatch.stop().start("gateway");injector.getInstance(GatewayService.class).close();stopWatch.stop().start("search");injector.getInstance(SearchService.class).close();stopWatch.stop().start("rest");injector.getInstance(RestController.class).close();stopWatch.stop().start("transport");injector.getInstance(TransportService.class).close();stopWatch.stop().start("percolator_service");injector.getInstance(PercolatorService.class).close();for (Class<? extends LifecycleComponent> plugin : pluginsService.nodeServices()) {stopWatch.stop().start("plugin(" + plugin.getName() + ")");injector.getInstance(plugin).close();}stopWatch.stop().start("script");try {injector.getInstance(ScriptService.class).close();} catch (IOException e) {logger.warn("ScriptService close failed", e);}stopWatch.stop().start("thread_pool");// TODO this should really use ThreadPool.terminate()injector.getInstance(ThreadPool.class).shutdown();try {injector.getInstance(ThreadPool.class).awaitTermination(10, TimeUnit.SECONDS);} catch (InterruptedException e) {// ignore}stopWatch.stop().start("thread_pool_force_shutdown");try {injector.getInstance(ThreadPool.class).shutdownNow();} catch (Exception e) {// ignore}stopWatch.stop();if (logger.isTraceEnabled()) {logger.trace("Close times for each service:\n{}", stopWatch.prettyPrint());}injector.getInstance(NodeEnvironment.class).close();injector.getInstance(PageCacheRecycler.class).close();logger.info("closed");}/*** Returns <tt>true</tt> if the node is closed.*/public boolean isClosed() {return lifecycle.closed();}public Injector injector() {return this.injector;}/** Writes a file to the logs dir containing the ports for the given transport type */private void writePortsFile(String type, BoundTransportAddress boundAddress) {Path tmpPortsFile = environment.logsFile().resolve(type + ".ports.tmp");try (BufferedWriter writer = Files.newBufferedWriter(tmpPortsFile, Charset.forName("UTF-8"))) {for (TransportAddress address : boundAddress.boundAddresses()) {InetAddress inetAddress = InetAddress.getByName(address.getAddress());if (inetAddress instanceof Inet6Address && inetAddress.isLinkLocalAddress()) {// no link local, just causes problemscontinue;}writer.write(NetworkAddress.formatAddress(new InetSocketAddress(inetAddress, address.getPort())) + "\n");}} catch (IOException e) {throw new RuntimeException("Failed to write ports file", e);}Path portsFile = environment.logsFile().resolve(type + ".ports");try {Files.move(tmpPortsFile, portsFile, StandardCopyOption.ATOMIC_MOVE);} catch (IOException e) {throw new RuntimeException("Failed to rename ports file", e);}} }

總結

以上是生活随笔為你收集整理的ElasticSearch2.3.5源码研究（一）的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。