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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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 org.apache.geode.internal.cache;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.apache.logging.log4j.Logger;

import org.apache.geode.UnmodifiableException;
import org.apache.geode.cache.Cache;
import org.apache.geode.distributed.internal.DistributionConfig;
import org.apache.geode.distributed.internal.ClusterConfigurationService;
import org.apache.geode.distributed.internal.tcpserver.TcpClient;
import org.apache.geode.internal.ConfigSource;
import org.apache.geode.internal.JarClassLoader;
import org.apache.geode.internal.JarDeployer;
import org.apache.geode.internal.admin.remote.DistributionLocatorId;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.lang.StringUtils;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.process.ClusterConfigurationNotAvailableException;
import org.apache.geode.management.internal.configuration.domain.Configuration;
import org.apache.geode.management.internal.configuration.messages.ConfigurationRequest;
import org.apache.geode.management.internal.configuration.messages.ConfigurationResponse;

public class ClusterConfigurationLoader {

  private static final Logger logger = LogService.getLogger();

  /**
   * Deploys the jars received from shared configuration, it undeploys any other jars that were not
   * part of shared configuration
   * 
   * @param cache Cache of this member
   * @param response {@link ConfigurationResponse} received from the locators
   * @throws IOException
   * @throws ClassNotFoundException
   */
  public static void deployJarsReceivedFromClusterConfiguration(Cache cache,
      ConfigurationResponse response) throws IOException, ClassNotFoundException {
    if (response == null)
      return;

    String[] jarFileNames = response.getJarNames();
    byte[][] jarBytes = response.getJars();

    final JarDeployer jarDeployer = new JarDeployer(
        ((GemFireCacheImpl) cache).getDistributedSystem().getConfig().getDeployWorkingDir());

    /******
     * Un-deploy the existing jars, deployed during cache creation, do not delete anything
     */

    if (jarFileNames != null && jarBytes != null) {
      JarClassLoader[] jarClassLoaders = jarDeployer.deploy(jarFileNames, jarBytes);
      for (int i = 0; i < jarFileNames.length; i++) {
        if (jarClassLoaders[i] != null) {
          logger.info("Deployed " + (jarClassLoaders[i].getFileCanonicalPath()));
        }
      }
    }
  }

  /***
   * Apply the cache-xml cluster configuration on this member
   * 
   * @param cache Cache created for this member
   * @param response {@link ConfigurationResponse} containing the requested {@link Configuration}
   * @param config this member's config.
   */
  public static void applyClusterXmlConfiguration(Cache cache, ConfigurationResponse response,
      DistributionConfig config) {
    if (response == null || response.getRequestedConfiguration().isEmpty())
      return;

    List groups = getGroups(config);
    Map requestedConfiguration = response.getRequestedConfiguration();

    List cacheXmlContentList = new LinkedList();

    // apply the cluster config first
    Configuration clusterConfiguration =
        requestedConfiguration.get(ClusterConfigurationService.CLUSTER_CONFIG);
    if (clusterConfiguration != null) {
      String cacheXmlContent = clusterConfiguration.getCacheXmlContent();
      if (!StringUtils.isBlank(cacheXmlContent)) {
        cacheXmlContentList.add(cacheXmlContent);
      }
    }

    // then apply the groups config
    for (String group : groups) {
      Configuration groupConfiguration = requestedConfiguration.get(group);
      if (groupConfiguration != null) {
        String cacheXmlContent = groupConfiguration.getCacheXmlContent();
        if (!StringUtils.isBlank(cacheXmlContent)) {
          cacheXmlContentList.add(cacheXmlContent);
        }
      }
    }

    // apply the requested cache xml
    for (String cacheXmlContent : cacheXmlContentList) {
      InputStream is = new ByteArrayInputStream(cacheXmlContent.getBytes());
      try {
        cache.loadCacheXml(is);
      } finally {
        try {
          is.close();
        } catch (IOException e) {
        }
      }
    }
  }

  /***
   * Apply the gemfire properties cluster configuration on this member
   * 
   * @param cache Cache created for this member
   * @param response {@link ConfigurationResponse} containing the requested {@link Configuration}
   * @param config this member's config
   */
  public static void applyClusterPropertiesConfiguration(Cache cache,
      ConfigurationResponse response, DistributionConfig config) {
    if (response == null || response.getRequestedConfiguration().isEmpty())
      return;

    List groups = getGroups(config);
    Map requestedConfiguration = response.getRequestedConfiguration();

    final Properties runtimeProps = new Properties();

    // apply the cluster config first
    Configuration clusterConfiguration =
        requestedConfiguration.get(ClusterConfigurationService.CLUSTER_CONFIG);
    if (clusterConfiguration != null) {
      runtimeProps.putAll(clusterConfiguration.getGemfireProperties());
    }

    // then apply the group config
    for (String group : groups) {
      Configuration groupConfiguration = requestedConfiguration.get(group);
      if (groupConfiguration != null) {
        runtimeProps.putAll(groupConfiguration.getGemfireProperties());
      }
    }

    Set attNames = runtimeProps.keySet();
    for (Object attNameObj : attNames) {
      String attName = (String) attNameObj;
      String attValue = runtimeProps.getProperty(attName);
      try {
        config.setAttribute(attName, attValue, ConfigSource.runtime());
      } catch (IllegalArgumentException e) {
        logger.info(e.getMessage());
      } catch (UnmodifiableException e) {
        logger.info(e.getMessage());
      }
    }
  }

  /**
   * Request the shared configuration for group(s) from locator(s) this member is bootstrapped with.
   *
   * This will request the group config this server belongs plus the "cluster" config
   * 
   * @param config this member's configuration.
   * @return {@link ConfigurationResponse}
   * @throws ClusterConfigurationNotAvailableException
   * @throws UnknownHostException
   */
  public static ConfigurationResponse requestConfigurationFromLocators(DistributionConfig config,
      List locatorList)
      throws ClusterConfigurationNotAvailableException, UnknownHostException {
    List groups = ClusterConfigurationLoader.getGroups(config);
    ConfigurationRequest request = new ConfigurationRequest();

    request.addGroups(ClusterConfigurationService.CLUSTER_CONFIG);
    for (String group : groups) {
      request.addGroups(group);
    }

    request.setNumAttempts(10);

    ConfigurationResponse response = null;
    // Try talking to all the locators in the list
    // to get the shared configuration.

    TcpClient client = new TcpClient();

    for (String locatorInfo : locatorList) {
      DistributionLocatorId dlId = new DistributionLocatorId(locatorInfo);
      String ipaddress = dlId.getBindAddress();
      InetAddress locatorInetAddress = null;

      if (!StringUtils.isBlank(ipaddress)) {
        locatorInetAddress = InetAddress.getByName(ipaddress);
      } else {
        locatorInetAddress = dlId.getHost();
      }

      int port = dlId.getPort();

      try {
        response = (ConfigurationResponse) client.requestToServer(locatorInetAddress, port, request,
            10000);
      } catch (UnknownHostException e) {
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Log
        e.printStackTrace();
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
      }
    }
    // if the response is null , that means Shared Configuration service is not installed on the
    // locator
    // and hence it returns null

    if (response == null || response.failedToGetSharedConfig()) {
      throw new ClusterConfigurationNotAvailableException(
          LocalizedStrings.Launcher_Command_FAILED_TO_GET_SHARED_CONFIGURATION.toLocalizedString());
    }

    return response;
  }

  private static List getGroups(DistributionConfig config) {
    String groupString = config.getGroups();
    List groups = new ArrayList();
    if (!StringUtils.isBlank(groupString)) {
      groups.addAll((Arrays.asList(groupString.split(","))));
    }
    return groups;
  }

}
 















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