com.gemstone.gemfire.internal.MigrationClient Maven / Gradle / Ivy
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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal;
import com.gemstone.gemfire.cache.Cache;
import com.gemstone.gemfire.cache.CacheFactory;
import com.gemstone.gemfire.cache.Region;
import com.gemstone.gemfire.distributed.DistributedSystem;
import com.gemstone.gemfire.distributed.internal.DistributionConfig;
import com.gemstone.gemfire.distributed.internal.InternalDistributedSystem;
import com.gemstone.gemfire.internal.cache.GemFireCacheImpl;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.Properties;
/**
* MigrationClient is used to retrieve all of the data for a region from
* a MigrationServer. First start a MigrationServer using one version of
* GemFire, then connect to it using a MigrationClient with another version
* of GemFire.
*
* Command line arguments are
* region name (required)
* cache-xml-file-name (required)
* server port (defaults to 10553)
* server address (defaults to local host)
*
* The region should be defined in the cache-xml file, and must also be
* defined in the server's cache-xml file.
*
*
* Typically, the cache-xml file will be exactly the same as the one used
* by the MigrationServer with different disk-dirs settings. When Region
* entries are transfered from the server to the client, they are then
* stored in new files in these directories.
*
* @author bruce
* @since 6.0.1
*
*/
public class MigrationClient {
final static boolean VERBOSE = MigrationServer.VERBOSE;
final static int VERSION = 551; // version for backward communications compatibility
protected static final int CODE_ERROR = MigrationServer.CODE_ERROR;
protected static final int CODE_ENTRY = MigrationServer.CODE_ENTRY; /* serialized key, serialized value */
protected static final int CODE_COMPLETED = MigrationServer.CODE_COMPLETED;
public static void main(String[] args) throws Exception {
int argIdx = 0;
String cacheXmlFileName = null;
String regionName = null;
String bindAddressName = null;
int serverPort = 10533;
if (args.length > argIdx+1) {
regionName = args[argIdx++];
cacheXmlFileName = args[argIdx++];
} else {
System.err.println("MigrationClient regionName [cache-xml-file] [server-port] [server-address]");
return;
}
if (args.length > argIdx) {
serverPort = Integer.parseInt(args[argIdx++]);
}
if (args.length > argIdx) {
bindAddressName = args[argIdx++];
}
MigrationClient instance = null;
try {
instance = new MigrationClient(cacheXmlFileName, bindAddressName, serverPort);
} catch (IllegalArgumentException e) {
System.err.println(e.getMessage());
System.exit(1);
}
instance.createDistributedSystem();
instance.createCache();
instance.getRegion(regionName);
}
private InetAddress serverAddress;
private int port;
private DistributedSystem distributedSystem;
private File cacheXmlFile;
private Cache cache;
private Socket server;
private int serverVersion;
private DataInputStream dis;
private DataOutputStream dos;
/**
* Create a MigrationClient to be used with a DistributedSystem and Cache
* that are created using GemFire APIs
* @param bindAddressName the server's address
* @param serverPort the server's port
*/
public MigrationClient(String bindAddressName, int serverPort) {
this.port = serverPort;
try {
this.serverAddress = InetAddress.getByName(bindAddressName);
} catch (IOException e) {
throw new IllegalArgumentException("Error - bind address cannot be resolved: '" + bindAddressName + "'");
}
}
/**
* this is for use by main()
*
* @param cacheXmlFileName the name of the xml file describing the cache, or null
* @param bindAddressName the name of the NIC to bind to, or null
* @param serverPort the port to connect to (must not be zero)
*/
private MigrationClient(String cacheXmlFileName, String bindAddressName, int serverPort) {
this(bindAddressName, serverPort);
this.cacheXmlFile = new File(cacheXmlFileName);
if (!this.cacheXmlFile.exists()) {
// in 6.x this should be localizable
System.err.println("Warning - file not found in local directory: '" + cacheXmlFileName + "'");
}
}
/**
* Create a distributed system. If this method is not invoked before running
* the MigrationServer, an existing distributed system must exist for the
* server to use.
*
* @throws Exception if there are any problems
*/
private void createDistributedSystem() throws Exception {
Properties dsProps = new Properties();
// if no discovery information has been explicitly given, use a loner ds
if (System.getProperty("gemfire." + DistributionConfig.MCAST_PORT_NAME) == null
&& System.getProperty("gemfire." + DistributionConfig.LOCATORS_NAME) == null) {
dsProps.put(DistributionConfig.MCAST_PORT_NAME, "0");
}
dsProps.put(DistributionConfig.LOG_FILE_NAME, "migrationClient.log");
if (this.cacheXmlFile != null) {
dsProps.put(DistributionConfig.CACHE_XML_FILE_NAME, this.cacheXmlFile.getName());
}
this.distributedSystem = DistributedSystem.connect(dsProps);
}
/**
* create the cache to be used by this migration server
* @throws Exception if there are any problems
*/
private void createCache() throws Exception {
if (this.distributedSystem == null) {
this.distributedSystem = InternalDistributedSystem.getConnectedInstance();
}
this.cache = CacheFactory.create(this.distributedSystem);
}
private void initDSAndCache() {
if (this.distributedSystem == null) {
this.distributedSystem = InternalDistributedSystem.getConnectedInstance();
}
if (this.cache == null) {
this.cache = GemFireCacheImpl.getInstance();
}
}
public Region getRegion(String regionName) throws IOException, ClassNotFoundException {
initDSAndCache();
Region region = null;
region = this.cache.getRegion(regionName);
try {
connectToServer();
if (this.serverVersion != VERSION) {
System.out.println("Don't know how to deal with version " + this.serverVersion);
throw new IOException("Server has incompatible version of MigrationServer");
}
this.dos.writeShort(MigrationServer.ClientRequest.REGION_REQUEST);
this.dos.writeUTF(regionName);
this.dos.flush();
boolean done = false;
while (!done) {
int responseCode = -1;
try {
responseCode = this.dis.readShort();
} catch (EOFException e) {
}
switch (responseCode) {
case -1:
throw new IOException("Server socket was closed while receiving entries");
case CODE_COMPLETED:
done = true;
break;
case CODE_ERROR:
String errorString = this.dis.readUTF();
System.err.println("Server responded with error: '" + errorString + "'");
throw new IOException(errorString);
case CODE_ENTRY:
Object key = (new ObjectInputStream(server.getInputStream())).readObject();
Object value = (new ObjectInputStream(server.getInputStream())).readObject();
if (VERBOSE) {
System.out.println("received " + key);
}
region.put(key, value);
break;
}
}
} finally {
if (server != null && !server.isClosed()) {
server.close();
}
}
return region;
}
private void connectToServer() throws IOException {
this.server = new Socket();
SocketAddress addr;
if (this.serverAddress != null) {
addr = new InetSocketAddress(this.serverAddress, this.port);
} else {
addr = new InetSocketAddress(SocketCreator.getLocalHost(), this.port);
}
if (VERBOSE) {
System.out.println("connecting to " + addr);
}
this.server.connect(addr);
this.dos = new DataOutputStream(this.server.getOutputStream());
this.dos.writeShort(VERSION);
this.dis = new DataInputStream(this.server.getInputStream());
this.serverVersion = this.dis.readShort();
}
}