quickstart.Transactions 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 quickstart;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Set;
import java.util.TreeSet;
import com.gemstone.gemfire.cache.Cache;
import com.gemstone.gemfire.cache.CacheFactory;
import com.gemstone.gemfire.cache.CacheTransactionManager;
import com.gemstone.gemfire.cache.Region;
/**
* You can execute transactions against the data in the distributed cache as
* you would in a database. GemFire transactions are compatible with Java
* Transaction API (JTA) transactions. Please refer to the quickstart guide
* for instructions on how to run this example.
*
*
* @author GemStone Systems, Inc.
* @since 4.1.1
*/
public class Transactions {
public static void main(String[] args) throws Exception {
System.out.println("\nThis example demonstrates transactions on a GemFire cache.");
System.out.println("\nConnecting to the distributed system and creating the cache.");
// Create the cache which causes the cache-xml-file to be parsed
Cache cache = new CacheFactory()
.set("name", "Transactions")
.set("cache-xml-file", "xml/Transactions.xml")
.create();
// Get the exampleRegion
Region exampleRegion = cache.getRegion("exampleRegion");
System.out.println("Example region, " + exampleRegion.getFullPath() + ", created in cache. ");
// Get JNDI(Java Naming and Directory interface) context
CacheTransactionManager tx = cache.getCacheTransactionManager();
// Print the data initial data in the region.
printRegionData(exampleRegion);
// Begin transaction that I will commit...
System.out.println("\nBefore the first transaction, the cache is empty.\n");
tx.begin();
for (int count = 0; count < 3; count++) {
String key = "key" + count;
String value = "CommitValue" + count;
System.out.println("Putting entry: " + key + ", " + value);
exampleRegion.put(key, value);
}
tx.commit();
System.out.println("\nAfter committing the first transaction, the cache contains:");
printRegionData(exampleRegion);
System.out.println("\nPress Enter to continue to next transaction...");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
bufferedReader.readLine();
// Begin a transaction which I will rollback...
System.out.println("Before the second transaction, the cache contains:");
printRegionData(exampleRegion);
System.out.println("");
tx.begin();
for (int count = 0; count < 3; count++) {
String key = "key" + count;
String value = "RollbackValue" + count;
System.out.println("Putting entry: " + key + ", " + value);
exampleRegion.put(key, value);
}
tx.rollback();
System.out.println("\nAfter rolling back the second transaction, the cache contains:");
printRegionData(exampleRegion);
// Close the cache and disconnect from GemFire distributed system
System.out.println("\nClosing the cache and disconnecting.");
cache.close();
}
private static void printRegionData(Region exampleRegion) {
Set keySet = new TreeSet(exampleRegion.keySet());
for (String entryKey: keySet) {
Region.Entry entry = exampleRegion.getEntry(entryKey);
String entryValue = entry.getValue();
System.out.println(" entry: " + entryKey + ", " + entryValue);
}
}
}