Introduced LeakDetector.id() to be consistent in logging the resource ID.

jetty-client/src/main/java/org/eclipse/jetty/client/LeakTrackingConnectionPool.java

@@ -25,12 +25,18 @@ import org.eclipse.jetty.util.Promise;
 
 public class LeakTrackingConnectionPool extends ConnectionPool
 {
-    private final LeakDetector<Connection> leakDetector;
+    private final LeakDetector<Connection> leakDetector = new LeakDetector<Connection>()
+    {
+        @Override
+        protected void leaked(LeakInfo leakInfo)
+        {
+            LeakTrackingConnectionPool.this.leaked(leakInfo);
+        }
+    };
 
-    public LeakTrackingConnectionPool(Destination destination, int maxConnections, Promise<Connection> connectionPromise, LeakDetector<Connection> leakDetector)
+    public LeakTrackingConnectionPool(Destination destination, int maxConnections, Promise<Connection> connectionPromise)
     {
         super(destination, maxConnections, connectionPromise);
-        this.leakDetector = leakDetector;
         start();
     }
 
@@ -69,13 +75,18 @@ public class LeakTrackingConnectionPool extends ConnectionPool
     protected void acquired(Connection connection)
     {
         if (!leakDetector.acquired(connection))
-            LOG.info("Connection {}@{} not tracked", connection, System.identityHashCode(connection));
+            LOG.info("Connection {}@{} not tracked", connection, leakDetector.id(connection));
     }
 
     @Override
     protected void released(Connection connection)
     {
         if (!leakDetector.released(connection))
-            LOG.info("Connection {}@{} released but not acquired", connection, System.identityHashCode(connection));
+            LOG.info("Connection {}@{} released but not acquired", connection, leakDetector.id(connection));
+    }
+
+    protected void leaked(LeakDetector.LeakInfo leakInfo)
+    {
+        LOG.info("Connection " + leakInfo.getResourceDescription() + " leaked at:", leakInfo.getStackFrames());
     }
 }

jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientLoadTest.java

@@ -18,9 +18,6 @@
 
 package org.eclipse.jetty.client;
 
-import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
-
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
@@ -31,7 +28,7 @@ import java.util.Random;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
-
+import java.util.concurrent.atomic.AtomicLong;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -62,6 +59,9 @@ import org.eclipse.jetty.util.thread.Scheduler;
 import org.junit.Assert;
 import org.junit.Test;
 
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
 public class HttpClientLoadTest extends AbstractHttpClientServerTest
 {
     private final Logger logger = Log.getLogger(HttpClientLoadTest.class);
@@ -76,6 +76,8 @@ public class HttpClientLoadTest extends AbstractHttpClientServerTest
     {
         int cores = Runtime.getRuntime().availableProcessors();
 
+        final AtomicLong connectionLeaks = new AtomicLong();
+
         start(new LoadHandler());
         server.stop();
         server.removeConnector(connector);
@@ -88,8 +90,6 @@ public class HttpClientLoadTest extends AbstractHttpClientServerTest
 
         client.stop();
         
-        final LeakDetector<Connection> connectionLeakDetector = new LeakDetector<Connection>();
-        
         HttpClient newClient = new HttpClient(new HttpClientTransportOverHTTP()
         {
             @Override
@@ -100,7 +100,14 @@ public class HttpClientLoadTest extends AbstractHttpClientServerTest
                     @Override
                     protected ConnectionPool newConnectionPool(HttpClient client)
                     {
-                        return new LeakTrackingConnectionPool(this, client.getMaxConnectionsPerDestination(), this, connectionLeakDetector);
+                        return new LeakTrackingConnectionPool(this, client.getMaxConnectionsPerDestination(), this)
+                        {
+                            @Override
+                            protected void leaked(LeakDetector.LeakInfo resource)
+                            {
+                                connectionLeaks.incrementAndGet();
+                            }
+                        };
                     }
                 };
             }
@@ -131,15 +138,17 @@ public class HttpClientLoadTest extends AbstractHttpClientServerTest
             run(random, iterations);
         }
 
+        System.gc();
+
         assertThat("Server BufferPool - leaked acquires", serverBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Server BufferPool - leaked releases", serverBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedResources(), is(0L));
         
         assertThat("Client BufferPool - leaked acquires", clientBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Client BufferPool - leaked releases", clientBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedResources(), is(0L));
         
-        assertThat("Connection Leaks", connectionLeakDetector.getUnreleasedCount(), is(0L));
+        assertThat("Connection Leaks", connectionLeaks.get(), is(0L));
     }
 
     private void run(Random random, int iterations) throws InterruptedException

jetty-fcgi/fcgi-server/src/test/java/org/eclipse/jetty/fcgi/server/AbstractHttpClientServerTest.java

@@ -18,15 +18,13 @@
 
 package org.eclipse.jetty.fcgi.server;
 
-import static org.hamcrest.Matchers.*;
+import java.util.concurrent.atomic.AtomicLong;
-import static org.junit.Assert.*;
 
 import org.eclipse.jetty.client.ConnectionPool;
 import org.eclipse.jetty.client.HttpClient;
 import org.eclipse.jetty.client.HttpDestination;
 import org.eclipse.jetty.client.LeakTrackingConnectionPool;
 import org.eclipse.jetty.client.Origin;
-import org.eclipse.jetty.client.api.Connection;
 import org.eclipse.jetty.fcgi.client.http.HttpClientTransportOverFCGI;
 import org.eclipse.jetty.fcgi.client.http.HttpDestinationOverFCGI;
 import org.eclipse.jetty.http.HttpScheme;
@@ -42,13 +40,16 @@ import org.eclipse.jetty.util.thread.QueuedThreadPool;
 import org.junit.After;
 import org.junit.Rule;
 
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
 public abstract class AbstractHttpClientServerTest
 {
     @Rule
     public final TestTracker tracker = new TestTracker();
     private LeakTrackingByteBufferPool serverBufferPool;
     private LeakTrackingByteBufferPool clientBufferPool;
-    private LeakDetector<Connection> connectionLeakDetector;
+    private final AtomicLong connectionLeaks = new AtomicLong();
     protected Server server;
     protected ServerConnector connector;
     protected HttpClient client;
@@ -71,8 +72,6 @@ public abstract class AbstractHttpClientServerTest
         QueuedThreadPool executor = new QueuedThreadPool();
         executor.setName(executor.getName() + "-client");
         
-        connectionLeakDetector = new LeakDetector<Connection>();
-
         client = new HttpClient(new HttpClientTransportOverFCGI(1, false, "")
         {
             @Override
@@ -83,7 +82,14 @@ public abstract class AbstractHttpClientServerTest
                     @Override
                     protected ConnectionPool newConnectionPool(HttpClient client)
                     {
-                        return new LeakTrackingConnectionPool(this, client.getMaxConnectionsPerDestination(), this, connectionLeakDetector);
+                        return new LeakTrackingConnectionPool(this, client.getMaxConnectionsPerDestination(), this)
+                        {
+                            @Override
+                            protected void leaked(LeakDetector.LeakInfo leakInfo)
+                            {
+                                connectionLeaks.incrementAndGet();
+                            }
+                        };
                     }
                 };
             }
@@ -98,15 +104,16 @@ public abstract class AbstractHttpClientServerTest
     public void dispose() throws Exception
     {
         System.gc();
+
         assertThat("Server BufferPool - leaked acquires", serverBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Server BufferPool - leaked releases", serverBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedResources(), is(0L));
         
         assertThat("Client BufferPool - leaked acquires", clientBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Client BufferPool - leaked releases", clientBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedResources(), is(0L));
         
-        assertThat("Connection Leaks", connectionLeakDetector.getUnreleasedCount(), is(0L));
+        assertThat("Connection Leaks", connectionLeaks.get(), is(0L));
 
         if (client != null)
             client.stop();

jetty-io/src/main/java/org/eclipse/jetty/io/LeakTrackingByteBufferPool.java

@@ -33,16 +33,24 @@ public class LeakTrackingByteBufferPool extends ContainerLifeCycle implements By
 
     private final LeakDetector<ByteBuffer> leakDetector = new LeakDetector<ByteBuffer>()
     {
-        public String id(ByteBuffer resource) 
+        public String id(ByteBuffer resource)
         {
             return BufferUtil.toIDString(resource);
         }
+
+        @Override
+        protected void leaked(LeakInfo leakInfo)
+        {
+            leaked.incrementAndGet();
+            LeakTrackingByteBufferPool.this.leaked(leakInfo);
+        }
     };
 
     private final static boolean NOISY = Boolean.getBoolean(LeakTrackingByteBufferPool.class.getName() + ".NOISY");
     private final ByteBufferPool delegate;
     private final AtomicLong leakedReleases = new AtomicLong(0);
     private final AtomicLong leakedAcquires = new AtomicLong(0);
+    private final AtomicLong leaked = new AtomicLong(0);
 
     public LeakTrackingByteBufferPool(ByteBufferPool delegate)
     {
@@ -54,12 +62,12 @@ public class LeakTrackingByteBufferPool extends ContainerLifeCycle implements By
     @Override
     public ByteBuffer acquire(int size, boolean direct)
     {
-        ByteBuffer buffer = delegate.acquire(size,direct);
+        ByteBuffer buffer = delegate.acquire(size, direct);
         boolean leaked = leakDetector.acquired(buffer);
         if (NOISY || !leaked)
         {
             leakedAcquires.incrementAndGet();
-            LOG.info(String.format("ByteBuffer acquire %s leaked.acquired=%s",leakDetector.id(buffer),leaked ? "normal" : "LEAK"),
+            LOG.info(String.format("ByteBuffer acquire %s leaked.acquired=%s", leakDetector.id(buffer), leaked ? "normal" : "LEAK"),
                     new Throwable("LeakStack.Acquire"));
         }
         return buffer;
@@ -71,46 +79,47 @@ public class LeakTrackingByteBufferPool extends ContainerLifeCycle implements By
         if (buffer == null)
             return;
         boolean leaked = leakDetector.released(buffer);
-        if (NOISY || !leaked) {
+        if (NOISY || !leaked)
+        {
             leakedReleases.incrementAndGet();
-            LOG.info(String.format("ByteBuffer release %s leaked.released=%s",leakDetector.id(buffer),leaked ? "normal" : "LEAK"),new Throwable(
+            LOG.info(String.format("ByteBuffer release %s leaked.released=%s", leakDetector.id(buffer), leaked ? "normal" : "LEAK"), new Throwable(
                     "LeakStack.Release"));
         }
         delegate.release(buffer);
     }
-    
+
     public void clearTracking()
     {
-        leakDetector.clear();
         leakedAcquires.set(0);
         leakedReleases.set(0);
     }
-    
+
     /**
-     * Get the count of BufferPool.acquire() calls that detected a leak
      * @return count of BufferPool.acquire() calls that detected a leak
      */
     public long getLeakedAcquires()
     {
         return leakedAcquires.get();
     }
-    
+
     /**
-     * Get the count of BufferPool.release() calls that detected a leak
      * @return count of BufferPool.release() calls that detected a leak
      */
     public long getLeakedReleases()
     {
         return leakedReleases.get();
     }
-    
+
     /**
-     * At the end of the run, when the LeakDetector runs, this reports the
+     * @return count of resources that were acquired but not released
-     * number of unreleased resources.
-     * @return count of resources that were acquired but not released (byt the end of the run)
      */
-    public long getLeakedUnreleased()
+    public long getLeakedResources()
     {
-        return leakDetector.getUnreleasedCount();
+        return leaked.get();
+    }
+
+    protected void leaked(LeakDetector<ByteBuffer>.LeakInfo leakInfo)
+    {
+        LOG.warn("ByteBuffer " + leakInfo.getResourceDescription() + " leaked at:", leakInfo.getStackFrames());
     }
 }

jetty-spdy/spdy-server/src/test/java/org/eclipse/jetty/spdy/server/SynDataReplyDataLoadTest.java

@@ -19,9 +19,6 @@
 
 package org.eclipse.jetty.spdy.server;
 
-import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
-
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.List;
@@ -60,6 +57,9 @@ import org.junit.Assert;
 import org.junit.Ignore;
 import org.junit.Test;
 
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
 public class SynDataReplyDataLoadTest extends AbstractTest
 {
     private static final int TIMEOUT = 60 * 1000;
@@ -192,13 +192,15 @@ public class SynDataReplyDataLoadTest extends AbstractTest
 
         threadPool.shutdown();
 
+        System.gc();
+
         assertThat("Server BufferPool - leaked acquires", serverBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Server BufferPool - leaked releases", serverBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Server BufferPool - unreleased", serverBufferPool.getLeakedResources(), is(0L));
         
         assertThat("Client BufferPool - leaked acquires", clientBufferPool.getLeakedAcquires(), is(0L));
         assertThat("Client BufferPool - leaked releases", clientBufferPool.getLeakedReleases(), is(0L));
-        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedUnreleased(), is(0L));
+        assertThat("Client BufferPool - unreleased", clientBufferPool.getLeakedResources(), is(0L));
     }
 
     private void synCompletedData(Session session, Fields headers, int iterations) throws Exception

jetty-util/src/main/java/org/eclipse/jetty/util/LeakDetector.java

@@ -20,9 +20,9 @@ package org.eclipse.jetty.util;
 
 import java.lang.ref.PhantomReference;
 import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.atomic.AtomicLong;
 
 import org.eclipse.jetty.util.component.AbstractLifeCycle;
 import org.eclipse.jetty.util.log.Log;
@@ -55,8 +55,7 @@ import org.eclipse.jetty.util.log.Logger;
  * has been released and if not, it reports a leak. Using {@link PhantomReference}s is better than overriding
  * {@link #finalize()} and works also in those cases where {@link #finalize()} is not overridable.
  *
- * @param <T>
+ * @param <T> the resource type.
- *            the resource type.
  */
 public class LeakDetector<T> extends AbstractLifeCycle implements Runnable
 {
@@ -64,14 +63,12 @@ public class LeakDetector<T> extends AbstractLifeCycle implements Runnable
 
     private final ReferenceQueue<T> queue = new ReferenceQueue<>();
     private final ConcurrentMap<String, LeakInfo> resources = new ConcurrentHashMap<>();
-    private final AtomicLong unreleasedCount = new AtomicLong(0);
     private Thread thread;
 
     /**
      * Tracks the resource as been acquired.
      *
-     * @param resource
+     * @param resource the resource that has been acquired
-     *            the resource that has been acquired
      * @return true whether the resource has been acquired normally, false if the resource has detected a leak (meaning
      *         that another acquire occurred before a release of the same resource)
      * @see #released(Object)
@@ -79,21 +76,20 @@ public class LeakDetector<T> extends AbstractLifeCycle implements Runnable
     public boolean acquired(T resource)
     {
         String id = id(resource);
-        LeakInfo info = resources.putIfAbsent(id,new LeakInfo(resource,id));
+        LeakInfo info = resources.putIfAbsent(id, new LeakInfo(resource,id));
         if (info != null)
         {
-            // leak detected, prior acquire exists (not released)
+            // Leak detected, prior acquire exists (not released) or id clash.
             return false;
         }
-        // normal behavior
+        // Normal behavior.
         return true;
     }
 
     /**
      * Tracks the resource as been released.
      *
-     * @param resource
+     * @param resource the resource that has been released
-     *            the resource that has been released
      * @return true whether the resource has been released normally (based on a previous acquire). false if the resource
      *         has been released without a prior acquire (such as a double release scenario)
      * @see #acquired(Object)
@@ -104,19 +100,18 @@ public class LeakDetector<T> extends AbstractLifeCycle implements Runnable
         LeakInfo info = resources.remove(id);
         if (info != null)
         {
-            // normal behavior
+            // Normal behavior.
             return true;
         }
 
-        // leak detected (released without acquire)
+        // Leak detected (released without acquire).
         return false;
     }
 
     /**
      * Generates a unique ID for the given resource.
      *
-     * @param resource
+     * @param resource the resource to generate the unique ID for
-     *            the resource to generate the unique ID for
      * @return the unique ID of the given resource
      */
     public String id(T resource)
@@ -164,23 +159,11 @@ public class LeakDetector<T> extends AbstractLifeCycle implements Runnable
     /**
      * Callback method invoked by {@link LeakDetector} when it detects that a resource has been leaked.
      *
-     * @param leakInfo
+     * @param leakInfo the information about the leak
-     *            the information about the leak
      */
     protected void leaked(LeakInfo leakInfo)
     {
         LOG.warn("Resource leaked: " + leakInfo.description,leakInfo.stackFrames);
-        unreleasedCount.incrementAndGet();
-    }
-
-    public void clear()
-    {
-        unreleasedCount.set(0);
-    }
-    
-    public long getUnreleasedCount()
-    {
-        return unreleasedCount.get();
     }
 
     /**

jetty-websocket/websocket-common/src/test/java/org/eclipse/jetty/websocket/common/test/LeakTrackingBufferPoolRule.java

@@ -18,15 +18,15 @@
 
 package org.eclipse.jetty.websocket.common.test;
 
-import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
-
 import org.eclipse.jetty.io.LeakTrackingByteBufferPool;
 import org.eclipse.jetty.io.MappedByteBufferPool;
 import org.junit.rules.TestRule;
 import org.junit.runner.Description;
 import org.junit.runners.model.Statement;
 
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
 public class LeakTrackingBufferPoolRule extends LeakTrackingByteBufferPool implements TestRule
 {
     private final String id;
@@ -41,7 +41,7 @@ public class LeakTrackingBufferPoolRule extends LeakTrackingByteBufferPool imple
     {
         assertThat("Leaked Acquires Count for [" + id + "]",getLeakedAcquires(),is(0L));
         assertThat("Leaked Releases Count for [" + id + "]",getLeakedReleases(),is(0L));
-        assertThat("Leaked Unrelesed Count for [" + id + "]",getLeakedUnreleased(),is(0L));
+        assertThat("Leaked Resource Count for [" + id + "]", getLeakedResources(),is(0L));
     }
 
     @Override