have KahaDB lock work in vm, so master slave tests can work ok. preserver kaha behaiour in this regard as it makes testing simpler. fix npe on shutdown if start fails

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@955973 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/main/java/org/apache/activemq/store/kahadb/KahaDBStore.java

@@ -205,7 +205,9 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter{
     public void doStop(ServiceStopper stopper) throws Exception {
         //drain down async jobs
         LOG.info("Stopping async queue tasks");
-        this.globalQueueSemaphore.tryAcquire(this.maxAsyncJobs, 60, TimeUnit.SECONDS);
+        if (this.globalQueueSemaphore != null) {
+            this.globalQueueSemaphore.tryAcquire(this.maxAsyncJobs, 60, TimeUnit.SECONDS);
+        }
         synchronized (this.asyncQueueMap) {
             for (StoreQueueTask task : this.asyncQueueMap.values()) {
                 task.cancel();
@@ -213,7 +215,9 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter{
             this.asyncQueueMap.clear();
         }
         LOG.info("Stopping async topic tasks");
-        this.globalTopicSemaphore.tryAcquire(this.maxAsyncJobs, 60, TimeUnit.SECONDS);
+        if (this.globalTopicSemaphore != null) {
+            this.globalTopicSemaphore.tryAcquire(this.maxAsyncJobs, 60, TimeUnit.SECONDS);
+        }
         synchronized (this.asyncTopicMap) {
             for (StoreTopicTask task : this.asyncTopicMap.values()) {
                 task.cancel();

activemq-ra/src/test/java/org/apache/activemq/ra/FailoverManagedClusterTest.java

@@ -49,8 +49,11 @@ import junit.framework.TestCase;
 import org.apache.activemq.ActiveMQConnectionFactory;
 import org.apache.activemq.broker.BrokerService;
 import org.apache.activemq.command.ActiveMQQueue;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 public class FailoverManagedClusterTest extends TestCase {
+    private static final Log LOG = LogFactory.getLog(FailoverManagedClusterTest.class);
     
     long txGenerator = System.currentTimeMillis();
     
@@ -61,12 +64,25 @@ public class FailoverManagedClusterTest extends TestCase {
     
     private BrokerService master;
     private BrokerService slave;
+    private CountDownLatch slaveThreadStarted = new CountDownLatch(1);
 
+    @Override
     protected void setUp() throws Exception {
         createAndStartMaster();
         createAndStartSlave();    
     }
     
+    @Override
+    protected void tearDown() throws Exception {
+        if (slave != null) {
+            slave.stop();
+        }
+        if (master != null) {
+            master.stop();
+        }
+    }
+
+
 
     private void createAndStartMaster() throws Exception {
         master = new BrokerService();
@@ -88,8 +104,9 @@ public class FailoverManagedClusterTest extends TestCase {
         new Thread(new Runnable() {
             public void run() {
                 try {
+                    slaveThreadStarted.countDown();
                     slave.start();
-                    System.out.println("slave has started");
+                    LOG.info("slave has started");
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
@@ -112,7 +129,7 @@ public class FailoverManagedClusterTest extends TestCase {
 
         final StubMessageEndpoint endpoint = new StubMessageEndpoint() {
             public void onMessage(Message message) {
-                System.out.println("Received message " + message);
+                LOG.info("Received message " + message);
                 super.onMessage(message);
                 messageDelivered.countDown();
             };
@@ -144,18 +161,14 @@ public class FailoverManagedClusterTest extends TestCase {
         } catch (InterruptedException e) {
         }
 
-        // Send the broker a message to that endpoint
         MessageProducer producer = session.createProducer(new ActiveMQQueue("TEST"));
+        slaveThreadStarted.await(10, TimeUnit.SECONDS);
         
-        // force a failover
+        // force a failover before send
+        LOG.info("Stopping master to force failover..");
         master.stop();
-        slave.waitUntilStarted();
+        master = null;
-
+        assertTrue("slave started ok", slave.waitUntilStarted());
-        try {
-            Thread.sleep(2000);
-        } catch (InterruptedException ie) {
-            // ignore
-        }
 
         producer.send(session.createTextMessage("Hello, again!"));
 

kahadb/src/main/java/org/apache/kahadb/util/LockFile.java

@@ -21,6 +21,7 @@ import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.nio.channels.FileLock;
 import java.nio.channels.OverlappingFileLockException;
+import java.util.Date;
 
 /**
  * Used to lock a File.
@@ -55,7 +56,9 @@ public class LockFile {
         }
         
         IOHelper.mkdirs(file.getParentFile());
-        
+        if (System.getProperty(getVmLockKey()) != null) {
+            throw new IOException("File '" + file + "' could not be locked as lock is already held for this jvm.");
+        }
         if (lock == null) {
             readFile = new RandomAccessFile(file, "rw");
             IOException reason = null;
@@ -66,6 +69,7 @@ public class LockFile {
             }
             if (lock != null) {
                 lockCounter++;
+                System.setProperty(getVmLockKey(), new Date().toString());
             } else {
                 // new read file for next attempt
                 closeReadFile();
@@ -94,6 +98,7 @@ public class LockFile {
         if (lock != null) {
             try {
                 lock.release();
+                System.getProperties().remove(getVmLockKey());
             } catch (Throwable ignore) {
             }
             lock = null;
@@ -105,6 +110,10 @@ public class LockFile {
         }
     }
 
+    private String getVmLockKey() throws IOException {
+        return getClass().getName() + ".lock." + file.getCanonicalPath();
+    }
+
     private void closeReadFile() {
         // close the file.
         if (readFile != null) {