hadoop ContextFactory 源码

  • 2022-10-20
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haddop ContextFactory 代码


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 * 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,
 * See the License for the specific language governing permissions and
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package org.apache.hadoop.yarn.server.applicationhistoryservice.webapp;

import org.apache.hadoop.yarn.api.records.timeline.TimelineEntity;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEntities;
import org.apache.hadoop.yarn.api.records.timeline.TimelineDomain;
import org.apache.hadoop.yarn.api.records.timeline.TimelineDomains;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEvents;
import org.apache.hadoop.yarn.api.records.timeline.TimelinePutResponse;
import org.apache.hadoop.yarn.server.webapp.dao.AppInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppsInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptsInfo;
import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
import org.apache.hadoop.yarn.server.webapp.dao.ContainersInfo;
import org.apache.hadoop.yarn.webapp.RemoteExceptionData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Set;
import java.util.HashSet;
import java.util.Arrays;
import java.util.Map;
import java.lang.reflect.Method;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

 * ContextFactory to reuse JAXBContextImpl for DAO Classes.
public final class ContextFactory {

  private static final Logger LOG =

  private static JAXBContext cacheContext;

  // All the dao classes from TimelineWebService and AHSWebService
  // added except TimelineEntity and TimelineEntities
  private static final Class[] CTYPES = {AppInfo.class, AppsInfo.class,
      AppAttemptInfo.class, AppAttemptsInfo.class, ContainerInfo.class,
      ContainersInfo.class, RemoteExceptionData.class, TimelineDomain.class,
      TimelineDomains.class, TimelineEvents.class, TimelinePutResponse.class};
  private static final Set<Class> CLASS_SET =
      new HashSet<>(Arrays.asList(CTYPES));

  // TimelineEntity has java.util.Set interface which JAXB
  // can't handle and throws IllegalAnnotationExceptions
  private static final Class[] IGNORE_TYPES = {TimelineEntity.class,
  private static final Set<Class> IGNORE_SET =
      new HashSet<>(Arrays.asList(IGNORE_TYPES));

  private static JAXBException je =
      new JAXBException("TimelineEntity and TimelineEntities has " +

  private static StackTraceElement[] stackTrace = new StackTraceElement[]{
      new StackTraceElement(ContextFactory.class.getName(),
      "createContext", "ContextFactory.java", -1)};

  private ContextFactory() {

  public static JAXBContext newContext(Class[] classes,
      Map<String, Object> properties) throws Exception {
    Class spFactory = Class.forName(
    Method m = spFactory.getMethod("createContext", Class[].class, Map.class);
    return (JAXBContext) m.invoke((Object) null, classes, properties);

  // Called from WebComponent.service
  public static JAXBContext createContext(Class[] classes,
      Map<String, Object> properties) throws Exception {
    for (Class c : classes) {
      if (IGNORE_SET.contains(c)) {
        throw je;
      if (!CLASS_SET.contains(c)) {
        try {
          return newContext(classes, properties);
        } catch (Exception e) {
          LOG.warn("Error while Creating JAXBContext", e);
          throw e;

    try {
      synchronized (ContextFactory.class) {
        if (cacheContext == null) {
          cacheContext = newContext(CTYPES, properties);
    } catch(Exception e) {
      LOG.warn("Error while Creating JAXBContext", e);
      throw e;
    return cacheContext;

  // Called from WebComponent.init
  public static JAXBContext createContext(String contextPath, ClassLoader
      classLoader, Map<String, Object> properties) throws Exception {
    Class spFactory = Class.forName(
    Method m = spFactory.getMethod("createContext", String.class,
        ClassLoader.class, Map.class);
    return (JAXBContext) m.invoke(null, contextPath, classLoader,



hadoop 源码目录


hadoop AHSController 源码

hadoop AHSErrorsAndWarningsPage 源码

hadoop AHSLogsPage 源码

hadoop AHSView 源码

hadoop AHSWebApp 源码

hadoop AHSWebServices 源码

hadoop AboutBlock 源码

hadoop AboutPage 源码

hadoop AppAttemptPage 源码

hadoop AppPage 源码

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