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Fix for http://issues.apache.org/activemq/browse/AMQ-1348 

Better file locking on windows.  We now use a seperate lock file to signifiy the lock on the kaha db.



git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@560352 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Hiram R. Chirino 2007-07-27 18:49:47 +00:00
parent 9d2e5418fe
commit 3b73e60233
3 changed files with 18 additions and 12 deletions
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20
activemq-core/src/main/java/org/apache/activemq/kaha/impl/KahaStore.java
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@ -20,6 +20,7 @@ package org.apache.activemq.kaha.impl;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileLock;
import java.util.Date;
import java.util.HashSet;
@ -27,6 +28,7 @@ import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.activemq.kaha.ContainerId;
import org.apache.activemq.kaha.ListContainer;
import org.apache.activemq.kaha.MapContainer;
@ -34,6 +36,7 @@ import org.apache.activemq.kaha.RuntimeStoreException;
import org.apache.activemq.kaha.Store;
import org.apache.activemq.kaha.StoreLocation;
import org.apache.activemq.kaha.impl.async.AsyncDataManager;
import org.apache.activemq.kaha.impl.async.ControlFile;
import org.apache.activemq.kaha.impl.async.DataManagerFacade;
import org.apache.activemq.kaha.impl.container.ListContainerImpl;
import org.apache.activemq.kaha.impl.container.MapContainerImpl;
@ -54,12 +57,13 @@ import org.apache.commons.logging.LogFactory;
public class KahaStore implements Store{
private final static String PROPERTY_PREFIX="org.apache.activemq.kaha.Store";
private final static boolean brokenFileLock="true".equals(System.getProperty(PROPERTY_PREFIX+".broken","false"));
private final static boolean disableLocking="true".equals(System.getProperty(PROPERTY_PREFIX+"DisableLocking",
private final static boolean brokenFileLock="true".equals(System.getProperty(PROPERTY_PREFIX+".FileLockBroken","false"));
private final static boolean disableLocking="true".equals(System.getProperty(PROPERTY_PREFIX+".DisableLocking",
"false"));
private static final Log log=LogFactory.getLog(KahaStore.class);
private File directory;
private final File directory;
private final String mode;
private IndexRootContainer mapsContainer;
private IndexRootContainer listsContainer;
private Map<ContainerId, ListContainerImpl> lists=new ConcurrentHashMap<ContainerId, ListContainerImpl>();
@ -68,13 +72,13 @@ public class KahaStore implements Store{
private Map<String, IndexManager> indexManagers=new ConcurrentHashMap<String, IndexManager>();
private IndexManager rootIndexManager; // contains all the root indexes
private boolean closed=false;
private String mode;
private boolean initialized;
private boolean logIndexChanges=false;
private boolean useAsyncDataManager=false;
private long maxDataFileLength=1024*1024*32;
private FileLock lock;
private boolean persistentIndex=true;
private RandomAccessFile lockFile;
public KahaStore(String name,String mode) throws IOException{
this.mode=mode;
@ -107,6 +111,8 @@ public class KahaStore implements Store{
iter.remove();
}
}
if( lockFile!=null )
lockFile.close();
}
}
@ -423,6 +429,9 @@ public class KahaStore implements Store{
if(!initialized){
log.info("Kaha Store using data directory "+directory);
lockFile = new RandomAccessFile(new File(directory, "lock"), "rw");
lock();
DataManager defaultDM=getDataManager(DEFAULT_CONTAINER_NAME);
rootIndexManager=getIndexManager(defaultDM,DEFAULT_CONTAINER_NAME);
IndexItem mapRoot=new IndexItem();
@ -437,7 +446,6 @@ public class KahaStore implements Store{
mapRoot=rootIndexManager.getIndex(0);
listRoot=rootIndexManager.getIndex(IndexItem.INDEX_SIZE);
}
lock();
initialized=true;
mapsContainer=new IndexRootContainer(mapRoot,rootIndexManager,defaultDM);
listsContainer=new IndexRootContainer(listRoot,rootIndexManager,defaultDM);
@ -459,7 +467,7 @@ public class KahaStore implements Store{
String property = System.getProperty(key);
if (null == property) {
if (!brokenFileLock) {
lock = rootIndexManager.getLock();
lock = lockFile.getChannel().tryLock();
if (lock == null) {
throw new StoreLockedExcpetion("Kaha Store " + directory.getName() + " is already opened by another application");
} else

4
activemq-core/src/main/java/org/apache/activemq/kaha/impl/index/IndexManager.java
View File

@ -159,10 +159,6 @@ public final class IndexManager{
this.length=value;
}
public synchronized FileLock getLock() throws IOException{
return indexFile.getChannel().tryLock();
}
public String toString(){
return "IndexManager:("+NAME_PREFIX+name+")";
}

6
activemq-core/src/test/java/org/apache/activemq/kaha/StoreTest.java
View File

@ -186,12 +186,14 @@ public class StoreTest extends TestCase{
}
public void testLock() throws Exception{
try {
store.doesListContainerExist("fred");
Store s = getStore();
s.doesListContainerExist("fred");
try {
s.doesListContainerExist("fred");
}catch(StoreLockedExcpetion e) {
return;
} finally {
s.close();
}
fail("Expected to catch an exception");
}