[logback-dev] [GIT] Logback: the generic, reliable, fast and flexible logging framework. branch, master, updated. v_0.9.28-26-g5be4443

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- Log -----------------------------------------------------------------
http://git.qos.ch/gitweb/?p=logback.git;a=commit;h=5be4443a22e7f8b886b867a29c141432179c1d53
http://github.com/ceki/logback/commit/5be4443a22e7f8b886b867a29c141432179c1d53

commit 5be4443a22e7f8b886b867a29c141432179c1d53
Author: Ceki Gulcu <ceki at qos.ch>
Date:   Thu Mar 17 16:54:28 2011 +0100

    working on LRUMessageCache

diff --git a/logback-classic/src/main/java/ch/qos/logback/classic/turbo/LRUMessageCache.java b/logback-classic/src/main/java/ch/qos/logback/classic/turbo/LRUMessageCache.java
index 90cd274..cfa963f 100644
--- a/logback-classic/src/main/java/ch/qos/logback/classic/turbo/LRUMessageCache.java
+++ b/logback-classic/src/main/java/ch/qos/logback/classic/turbo/LRUMessageCache.java
@@ -27,7 +27,7 @@ class LRUMessageCache extends LinkedHashMap<String, Integer> {
   LRUMessageCache(int cacheSize) {
     super((int) (cacheSize * (4.0f / 3)), 0.75f, true);
     if (cacheSize < 1) {
-      throw new IllegalArgumentException("Cache size cannnot be smaller than 1");
+      throw new IllegalArgumentException("Cache size cannot be smaller than 1");
     }
     this.cacheSize = cacheSize;
   }
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/turbo/LRUMessageCacheTest.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/LRUMessageCacheTest.java
new file mode 100644
index 0000000..5e2fed3
--- /dev/null
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/LRUMessageCacheTest.java
@@ -0,0 +1,80 @@
+package ch.qos.logback.classic.turbo;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+
+public class LRUMessageCacheTest {
+  private static final int INVOCATIONS_PER_TASK = 500 * 1024;
+  private static final int THREADS_NUMBER = 16;
+
+  @Test
+  public void testEldestEntriesRemoval() {
+    final LRUMessageCache cache = new LRUMessageCache(2);
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("0"));
+    Assert.assertEquals(1, cache.getMessageCountAndThenIncrement("0"));
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("1"));
+    Assert.assertEquals(1, cache.getMessageCountAndThenIncrement("1"));
+    // 0 entry should have been removed.
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("2"));
+    // So it is expected a returned value of 0 instead of 2.
+    // 1 entry should have been removed.
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("0"));
+    // So it is expected a returned value of 0 instead of 2.
+    // 2 entry should have been removed.
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("1"));
+    // So it is expected a returned value of 0 instead of 2.
+    Assert.assertEquals(0, cache.getMessageCountAndThenIncrement("2"));
+  }
+
+  @Test
+  public void multiThreadsTest() throws InterruptedException, ExecutionException {
+    final LRUMessageCache cache = new LRUMessageCache(THREADS_NUMBER);
+
+    ArrayList<TestTask> tasks = new ArrayList<TestTask>(THREADS_NUMBER);
+    for (int i = 0; i < THREADS_NUMBER; i++) {
+      tasks.add(new TestTask(cache));
+    }
+
+    ExecutorService execSrv = Executors.newFixedThreadPool(THREADS_NUMBER);
+
+    List<Future<Boolean>> futures = execSrv.invokeAll(tasks);
+    for (Future<Boolean> future : futures) {
+      // Validate that task has successfully finished.
+      future.get();
+    }
+  }
+
+  /**
+   * Each thread is using always the same "Message" key.
+   */
+  private class TestTask implements Callable<Boolean> {
+    private int prevValue = -1;
+    private final LRUMessageCache cache;
+
+    public TestTask(LRUMessageCache cache) {
+      this.cache = cache;
+    }
+
+    public Boolean call() throws Exception {
+      String msg = Thread.currentThread().getName();
+
+      for (int i = 0; i < INVOCATIONS_PER_TASK; i++) {
+        int current = cache.getMessageCountAndThenIncrement(msg);
+        // Ensure that new count is greater than previous count.
+        Assert.assertEquals(prevValue + 1, current);
+        prevValue = current;
+      }
+
+      return true;
+    }
+  }
+}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/Event.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Event.java
similarity index 90%
rename from logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/Event.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Event.java
index 6219c35..b9bb777 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/Event.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Event.java
@@ -1,33 +1,33 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern.lru;
-
-public class Event<K> {
-
-  final public boolean put;
-  final public K k;
-  
-  public Event(boolean put, K k) {
-    this.put = put;
-    this.k = k;
-  }
-  
-  public String toString() {
-    if(put) {
-      return "Event: put, "+k;
-    } else {
-      return "Event: get, "+k;
-    }
-  }
-}
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+public class Event<K> {
+
+  final public boolean put;
+  final public K k;
+  
+  public Event(boolean put, K k) {
+    this.put = put;
+    this.k = k;
+  }
+  
+  public String toString() {
+    if(put) {
+      return "Event: put, "+k;
+    } else {
+      return "Event: get, "+k;
+    }
+  }
+}
diff --git a/logback-classic/src/main/java/ch/qos/logback/classic/pattern/LRUCache.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCache.java
similarity index 93%
rename from logback-classic/src/main/java/ch/qos/logback/classic/pattern/LRUCache.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCache.java
index c2b426a..9bec9d8 100644
--- a/logback-classic/src/main/java/ch/qos/logback/classic/pattern/LRUCache.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCache.java
@@ -1,51 +1,51 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern;
-
-import java.util.ArrayList;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-
-/**
- * An lru cache based on Java's LinkedHashMap.
- * 
- * @author Ceki Gulcu
- *
- * @param <K>
- * @param <V>
- */
-public class LRUCache<K, V> extends LinkedHashMap<K, V> {
-  private static final long serialVersionUID = -6592964689843698200L;
-
-  final int cacheSize;
-
-  public LRUCache(int cacheSize) {
-    super((int) (cacheSize*(4.0f/3)), 0.75f, true);
-    if(cacheSize < 1) {
-      throw new IllegalArgumentException("Cache size cannnot be smaller than 1");
-   } 
-    this.cacheSize = cacheSize;
-  }
-  
-  protected boolean removeEldestEntry(Map.Entry eldest) {
-    return (size() > cacheSize);
-  }
-  
-  List<K> keyList() {
-    ArrayList<K> al = new ArrayList<K>();
-    al.addAll(keySet());
-    return al;
-  }
-}
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * An lru cache based on Java's LinkedHashMap.
+ * 
+ * @author Ceki Gulcu
+ *
+ * @param <K>
+ * @param <V>
+ */
+public class LRUCache<K, V> extends LinkedHashMap<K, V> {
+  private static final long serialVersionUID = -6592964689843698200L;
+
+  final int cacheSize;
+
+  public LRUCache(int cacheSize) {
+    super((int) (cacheSize*(4.0f/3)), 0.75f, true);
+    if(cacheSize < 1) {
+      throw new IllegalArgumentException("Cache size cannnot be smaller than 1");
+   } 
+    this.cacheSize = cacheSize;
+  }
+  
+  protected boolean removeEldestEntry(Map.Entry eldest) {
+    return (size() > cacheSize);
+  }
+  
+  List<K> keyList() {
+    ArrayList<K> al = new ArrayList<K>();
+    al.addAll(keySet());
+    return al;
+  }
+}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/LRUCacheTest.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCacheTest.java
similarity index 95%
rename from logback-classic/src/test/java/ch/qos/logback/classic/pattern/LRUCacheTest.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCacheTest.java
index c9628b6..96e04c0 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/LRUCacheTest.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/LRUCacheTest.java
@@ -1,125 +1,122 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.LinkedList;
-import java.util.List;
-
-import org.junit.Ignore;
-import org.junit.Test;
-
-import ch.qos.logback.classic.pattern.lru.Event;
-import ch.qos.logback.classic.pattern.lru.T_LRUCache;
-
- at Ignore
-public class LRUCacheTest {
-
-  @Test
-  public void smoke() {
-    
-    LRUCache<String, String> cache = new LRUCache<String, String>(2);
-    cache.put("a", "a");
-    cache.put("b", "b");
-    cache.put("c", "c");
-    List<String> witness = new LinkedList<String>();
-    witness.add("b");
-    witness.add("c");
-    assertEquals(witness, cache.keyList());
-  }
-
-  @Test
-  public void typicalScenarioTest() {
-    int simulationLen = 1000 * 10;
-    int cacheSize = 100;
-    int worldSize = 1000;
-    doScenario(simulationLen, cacheSize, worldSize);
-  }
-
-  @Test
-  public void scenarioCoverageTest() {
-    int simulationLen = 1000 * 10;
-
-    int[] cacheSizes = new int[] { 1, 10, 100};
-    // tests with large worldSizes are slow because with a large
-    // world size the probability of a cache miss is high.
-    int[] worldSizes = new int[] { 1, 10, 100 };
-
-    for (int i = 0; i < cacheSizes.length; i++) {
-      for (int j = 0; j < worldSizes.length; j++) {
-        doScenario(simulationLen, cacheSizes[i], worldSizes[j]);
-      }
-    }
-  }
-
-  void doScenario(int simulationLen, int cacheSize, int worldSize) {
-    int get2PutRatio = 10;
-    Simulator simulator = new Simulator(worldSize, get2PutRatio, false);
-    List<Event> scenario = simulator.generateScenario(simulationLen);
-    LRUCache<String, String> lruCache = new LRUCache<String, String>(cacheSize);
-    T_LRUCache<String> tlruCache = new T_LRUCache<String>(cacheSize);
-    long start = System.nanoTime();
-    simulator.simulate(scenario, lruCache, tlruCache);
-    //assertEquals(tlruCache.keyList(), lruCache.keyList());
-    long end = System.nanoTime();
-    System.out.println("cacheSize=" + cacheSize + ", worldSize=" + worldSize
-        + ", elapsed time=" + ((end - start) / (1000 * 1000)) + " in millis");
-  }
-  
-  
-  
-  @Test
-  @Ignore // slow test that is known to pass
-  public void multiThreadedScenario() throws InterruptedException {
-    int cacheSize = 100;
-    int worldSize = cacheSize*2;
-    LRUCache<String, String> lruCache = new LRUCache<String, String>(cacheSize);
-    T_LRUCache<String> tlruCache = new T_LRUCache<String>(cacheSize);
-    SimulatorRunnable[] simulatorArray = new SimulatorRunnable[5];
-    for(int i = 0; i < simulatorArray.length; i++) {
-      simulatorArray[i] = new SimulatorRunnable(lruCache, tlruCache, worldSize);
-    }
-    for(int i = 0; i < simulatorArray.length; i++) {
-      simulatorArray[i].start();
-    }
-    for(int i = 0; i < simulatorArray.length; i++) {
-      simulatorArray[i].join();
-    }
-    assertEquals(tlruCache.keyList(), lruCache.keyList());
-  }
-  
-  private class SimulatorRunnable extends Thread {
-
-    LRUCache<String, String> lruCache;
-    T_LRUCache<String> tlruCache;
-    int worldSize;
-    
-    SimulatorRunnable(LRUCache<String, String> lruCache, T_LRUCache<String> tlruCache, int worldSize) {
-      this.lruCache = lruCache;
-      this.tlruCache = tlruCache;
-      this.worldSize = worldSize;
-    }
-    
-    public void run() {
-      int get2PutRatio = 10;
-      int simulationLen = 1000*50;
-      Simulator simulator = new Simulator(worldSize, get2PutRatio, true);
-      List<Event> scenario = simulator.generateScenario(simulationLen);
-      simulator.simulate(scenario, lruCache, tlruCache);
-      System.out.println("done");
-    }
-  }
-  
-}
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+ at Ignore
+public class LRUCacheTest {
+
+  @Test
+  public void smoke() {
+    
+    LRUCache<String, String> cache = new LRUCache<String, String>(2);
+    cache.put("a", "a");
+    cache.put("b", "b");
+    cache.put("c", "c");
+    List<String> witness = new LinkedList<String>();
+    witness.add("b");
+    witness.add("c");
+    assertEquals(witness, cache.keyList());
+  }
+
+  @Test
+  public void typicalScenarioTest() {
+    int simulationLen = 1000 * 10;
+    int cacheSize = 100;
+    int worldSize = 1000;
+    doScenario(simulationLen, cacheSize, worldSize);
+  }
+
+  @Test
+  public void scenarioCoverageTest() {
+    int simulationLen = 1000 * 10;
+
+    int[] cacheSizes = new int[] { 1, 10, 100};
+    // tests with large worldSizes are slow because with a large
+    // world size the probability of a cache miss is high.
+    int[] worldSizes = new int[] { 1, 10, 100 };
+
+    for (int i = 0; i < cacheSizes.length; i++) {
+      for (int j = 0; j < worldSizes.length; j++) {
+        doScenario(simulationLen, cacheSizes[i], worldSizes[j]);
+      }
+    }
+  }
+
+  void doScenario(int simulationLen, int cacheSize, int worldSize) {
+    int get2PutRatio = 10;
+    Simulator simulator = new Simulator(worldSize, get2PutRatio, false);
+    List<Event> scenario = simulator.generateScenario(simulationLen);
+    LRUCache<String, String> lruCache = new LRUCache<String, String>(cacheSize);
+    T_LRUCache<String> tlruCache = new T_LRUCache<String>(cacheSize);
+    long start = System.nanoTime();
+    simulator.simulate(scenario, lruCache, tlruCache);
+    //assertEquals(tlruCache.keyList(), lruCache.keyList());
+    long end = System.nanoTime();
+    System.out.println("cacheSize=" + cacheSize + ", worldSize=" + worldSize
+        + ", elapsed time=" + ((end - start) / (1000 * 1000)) + " in millis");
+  }
+  
+  
+  
+  @Test
+  @Ignore // slow test that is known to pass
+  public void multiThreadedScenario() throws InterruptedException {
+    int cacheSize = 100;
+    int worldSize = cacheSize*2;
+    LRUCache<String, String> lruCache = new LRUCache<String, String>(cacheSize);
+    T_LRUCache<String> tlruCache = new T_LRUCache<String>(cacheSize);
+    SimulatorRunnable[] simulatorArray = new SimulatorRunnable[5];
+    for(int i = 0; i < simulatorArray.length; i++) {
+      simulatorArray[i] = new SimulatorRunnable(lruCache, tlruCache, worldSize);
+    }
+    for(int i = 0; i < simulatorArray.length; i++) {
+      simulatorArray[i].start();
+    }
+    for(int i = 0; i < simulatorArray.length; i++) {
+      simulatorArray[i].join();
+    }
+    assertEquals(tlruCache.keyList(), lruCache.keyList());
+  }
+  
+  private class SimulatorRunnable extends Thread {
+
+    LRUCache<String, String> lruCache;
+    T_LRUCache<String> tlruCache;
+    int worldSize;
+    
+    SimulatorRunnable(LRUCache<String, String> lruCache, T_LRUCache<String> tlruCache, int worldSize) {
+      this.lruCache = lruCache;
+      this.tlruCache = tlruCache;
+      this.worldSize = worldSize;
+    }
+    
+    public void run() {
+      int get2PutRatio = 10;
+      int simulationLen = 1000*50;
+      Simulator simulator = new Simulator(worldSize, get2PutRatio, true);
+      List<Event> scenario = simulator.generateScenario(simulationLen);
+      simulator.simulate(scenario, lruCache, tlruCache);
+      System.out.println("done");
+    }
+  }
+  
+}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/Simulator.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Simulator.java
similarity index 94%
rename from logback-classic/src/test/java/ch/qos/logback/classic/pattern/Simulator.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Simulator.java
index d07fdc4..a1eea56 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/Simulator.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/Simulator.java
@@ -1,92 +1,89 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Random;
-
-import ch.qos.logback.classic.pattern.lru.Event;
-import ch.qos.logback.classic.pattern.lru.T_LRUCache;
-
-public class Simulator {
-
-  Random random;
-
-  int worldSize;
-  int get2PutRatio;
-  boolean multiThreaded;
-
-  public Simulator(int worldSize, int get2PutRatio, boolean multiThreaded) {
-    this.worldSize = worldSize;
-    this.get2PutRatio = get2PutRatio;
-    long seed = System.nanoTime();
-    // System.out.println("seed is "+seed);
-    random = new Random(seed);
-    this.multiThreaded = multiThreaded;
-  }
-
-  public List<Event> generateScenario(int len) {
-    List<Event> scenario = new ArrayList<Event>();
-
-    for (int i = 0; i < len; i++) {
-
-      int r = random.nextInt(get2PutRatio);
-      boolean put = false;
-      if (r == 0) {
-        put = true;
-      }
-      r = random.nextInt(worldSize);
-      Event<String> e = new Event<String>(put, String.valueOf(r));
-      scenario.add(e);
-    }
-    return scenario;
-  }
-
-  public void simulate(List<Event> scenario, LRUCache<String, String> lruCache,
-      T_LRUCache<String> tlruCache) {
-    for (Event<String> e : scenario) {
-      if (e.put) {
-        lruCache.put(e.k, e.k);
-        tlruCache.put(e.k);
-      } else {
-        String r0 = lruCache.get(e.k);
-        String r1 = tlruCache.get(e.k);
-        if (!multiThreaded) {
-          // if the simulation is used in a multi-threaded
-          // context, then the state of lruCache may be different than
-          // that of tlruCache. In single threaded mode, they should
-          // return the same values all the time
-          if (r0 != null) {
-            assertEquals(r0, e.k);
-          }
-          assertEquals(r0, r1);
-        }
-      }
-    }
-  }
-
-  // void compareAndDumpIfDifferent(LRUCache<String, String> lruCache,
-  // T_LRUCache<String> tlruCache) {
-  // lruCache.dump();
-  // tlruCache.dump();
-  // if(!lruCache.keyList().equals(tlruCache.ketList())) {
-  // lruCache.dump();
-  // tlruCache.dump();
-  // throw new AssertionFailedError("s");
-  // }
-  // }
-}
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class Simulator {
+
+  Random random;
+
+  int worldSize;
+  int get2PutRatio;
+  boolean multiThreaded;
+
+  public Simulator(int worldSize, int get2PutRatio, boolean multiThreaded) {
+    this.worldSize = worldSize;
+    this.get2PutRatio = get2PutRatio;
+    long seed = System.nanoTime();
+    // System.out.println("seed is "+seed);
+    random = new Random(seed);
+    this.multiThreaded = multiThreaded;
+  }
+
+  public List<Event> generateScenario(int len) {
+    List<Event> scenario = new ArrayList<Event>();
+
+    for (int i = 0; i < len; i++) {
+
+      int r = random.nextInt(get2PutRatio);
+      boolean put = false;
+      if (r == 0) {
+        put = true;
+      }
+      r = random.nextInt(worldSize);
+      Event<String> e = new Event<String>(put, String.valueOf(r));
+      scenario.add(e);
+    }
+    return scenario;
+  }
+
+  public void simulate(List<Event> scenario, LRUCache<String, String> lruCache,
+      T_LRUCache<String> tlruCache) {
+    for (Event<String> e : scenario) {
+      if (e.put) {
+        lruCache.put(e.k, e.k);
+        tlruCache.put(e.k);
+      } else {
+        String r0 = lruCache.get(e.k);
+        String r1 = tlruCache.get(e.k);
+        if (!multiThreaded) {
+          // if the simulation is used in a multi-threaded
+          // context, then the state of lruCache may be different than
+          // that of tlruCache. In single threaded mode, they should
+          // return the same values all the time
+          if (r0 != null) {
+            assertEquals(r0, e.k);
+          }
+          assertEquals(r0, r1);
+        }
+      }
+    }
+  }
+
+  // void compareAndDumpIfDifferent(LRUCache<String, String> lruCache,
+  // T_LRUCache<String> tlruCache) {
+  // lruCache.dump();
+  // tlruCache.dump();
+  // if(!lruCache.keyList().equals(tlruCache.ketList())) {
+  // lruCache.dump();
+  // tlruCache.dump();
+  // throw new AssertionFailedError("s");
+  // }
+  // }
+}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_Entry.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_Entry.java
similarity index 92%
rename from logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_Entry.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_Entry.java
index 59cff0a..980ab2e 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_Entry.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_Entry.java
@@ -1,45 +1,45 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern.lru;
-
-public class T_Entry<K> implements Comparable {
-
-  K k;
-  long sequenceNumber;
-  
-  T_Entry(K k, long sn) {
-    this.k = k;
-    this.sequenceNumber = sn;
-  }
-
-  public int compareTo(Object o) {
-    if(!(o instanceof T_Entry)) {
-      throw new IllegalArgumentException("arguments must be of type "+T_Entry.class);
-    }
-    
-    T_Entry other = (T_Entry) o;
-    if(sequenceNumber > other.sequenceNumber) {
-      return 1;
-    }
-    if(sequenceNumber == other.sequenceNumber) {
-      return 0;
-    }
-    return -1;
-  }
-  @Override
-  public String toString() {
-    return "("+k+","+sequenceNumber+")";
-    //return "("+k+")";
-  }
-}
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+public class T_Entry<K> implements Comparable {
+
+  K k;
+  long sequenceNumber;
+  
+  T_Entry(K k, long sn) {
+    this.k = k;
+    this.sequenceNumber = sn;
+  }
+
+  public int compareTo(Object o) {
+    if(!(o instanceof T_Entry)) {
+      throw new IllegalArgumentException("arguments must be of type "+T_Entry.class);
+    }
+    
+    T_Entry other = (T_Entry) o;
+    if(sequenceNumber > other.sequenceNumber) {
+      return 1;
+    }
+    if(sequenceNumber == other.sequenceNumber) {
+      return 0;
+    }
+    return -1;
+  }
+  @Override
+  public String toString() {
+    return "("+k+","+sequenceNumber+")";
+    //return "("+k+")";
+  }
+}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_LRUCache.java b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_LRUCache.java
similarity index 94%
rename from logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_LRUCache.java
rename to logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_LRUCache.java
index d132ee1..ebb7150 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/pattern/lru/T_LRUCache.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/turbo/lru/T_LRUCache.java
@@ -1,93 +1,93 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
- *
- * This program and the accompanying materials are dual-licensed under
- * either the terms of the Eclipse Public License v1.0 as published by
- * the Eclipse Foundation
- *
- *   or (per the licensee's choosing)
- *
- * under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation.
- */
-package ch.qos.logback.classic.pattern.lru;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-
-/**
- * This is an alternative (slower) implementation of LRUCache for testing
- * purposes.
- * 
- * @author Ceki Gulcu
- */
-public class T_LRUCache<K> {
-
-  int sequenceNumber;
-  final int cacheSize;
-  List<T_Entry<K>> cacheList = new LinkedList<T_Entry<K>>();
-
-  public T_LRUCache(int size) {
-    this.cacheSize = size;
-  }
-
-  @SuppressWarnings("unchecked")
-  synchronized public void put(K k) {
-    sequenceNumber++;
-    T_Entry<K> te = getEntry(k);
-    if (te != null) {
-      te.sequenceNumber = sequenceNumber;
-    } else {
-      te = new T_Entry<K>(k, sequenceNumber);
-      cacheList.add(te);
-    }
-    Collections.sort(cacheList);
-    while(cacheList.size() > cacheSize) {
-      cacheList.remove(0);    
-    }
-  }
-
-  @SuppressWarnings("unchecked")
-  synchronized public K get(K k) {
-    T_Entry<K> te = getEntry(k);
-    if (te == null) {
-      return null;
-    } else {
-      te.sequenceNumber = ++sequenceNumber;
-      Collections.sort(cacheList);
-      return te.k;
-    }
-  }
-
-  synchronized public List<K> keyList() {
-    List<K> keyList = new ArrayList<K>();
-    for (T_Entry<K> e : cacheList) {
-      keyList.add(e.k);
-    }
-    return keyList;
-  }
-
-  private T_Entry<K> getEntry(K k) {
-    for (int i = 0; i < cacheList.size(); i++) {
-      T_Entry<K> te = cacheList.get(i);
-      if (te.k.equals(k)) {
-        return te;
-      }
-    }
-    return null;
-  }
-  
-  public void dump() {
-    System.out.print("T:");
-    for (T_Entry<K> te : cacheList) {
-      //System.out.print(te.toString()+"->");
-      System.out.print(te.k+", ");
-    }
-    System.out.println();
-  }
-
-}
-
+/**
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+package ch.qos.logback.classic.turbo.lru;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * This is an alternative (slower) implementation of LRUCache for testing
+ * purposes.
+ * 
+ * @author Ceki Gulcu
+ */
+public class T_LRUCache<K> {
+
+  int sequenceNumber;
+  final int cacheSize;
+  List<T_Entry<K>> cacheList = new LinkedList<T_Entry<K>>();
+
+  public T_LRUCache(int size) {
+    this.cacheSize = size;
+  }
+
+  @SuppressWarnings("unchecked")
+  synchronized public void put(K k) {
+    sequenceNumber++;
+    T_Entry<K> te = getEntry(k);
+    if (te != null) {
+      te.sequenceNumber = sequenceNumber;
+    } else {
+      te = new T_Entry<K>(k, sequenceNumber);
+      cacheList.add(te);
+    }
+    Collections.sort(cacheList);
+    while(cacheList.size() > cacheSize) {
+      cacheList.remove(0);    
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  synchronized public K get(K k) {
+    T_Entry<K> te = getEntry(k);
+    if (te == null) {
+      return null;
+    } else {
+      te.sequenceNumber = ++sequenceNumber;
+      Collections.sort(cacheList);
+      return te.k;
+    }
+  }
+
+  synchronized public List<K> keyList() {
+    List<K> keyList = new ArrayList<K>();
+    for (T_Entry<K> e : cacheList) {
+      keyList.add(e.k);
+    }
+    return keyList;
+  }
+
+  private T_Entry<K> getEntry(K k) {
+    for (int i = 0; i < cacheList.size(); i++) {
+      T_Entry<K> te = cacheList.get(i);
+      if (te.k.equals(k)) {
+        return te;
+      }
+    }
+    return null;
+  }
+  
+  public void dump() {
+    System.out.print("T:");
+    for (T_Entry<K> te : cacheList) {
+      //System.out.print(te.toString()+"->");
+      System.out.print(te.k+", ");
+    }
+    System.out.println();
+  }
+
+}
+

-----------------------------------------------------------------------

Summary of changes:
 .../qos/logback/classic/turbo/LRUMessageCache.java |    2 +-
 .../logback/classic/turbo/LRUMessageCacheTest.java |   80 +++++++
 .../classic/{pattern => turbo}/lru/Event.java      |   66 +++---
 .../qos/logback/classic/turbo/lru}/LRUCache.java   |  102 ++++----
 .../{pattern => turbo/lru}/LRUCacheTest.java       |  247 ++++++++++----------
 .../classic/{pattern => turbo/lru}/Simulator.java  |  181 +++++++--------
 .../classic/{pattern => turbo}/lru/T_Entry.java    |   90 ++++----
 .../classic/{pattern => turbo}/lru/T_LRUCache.java |  186 ++++++++--------
 8 files changed, 514 insertions(+), 440 deletions(-)
 create mode 100644 logback-classic/src/test/java/ch/qos/logback/classic/turbo/LRUMessageCacheTest.java
 rename logback-classic/src/test/java/ch/qos/logback/classic/{pattern => turbo}/lru/Event.java (90%)
 rename logback-classic/src/{main/java/ch/qos/logback/classic/pattern => test/java/ch/qos/logback/classic/turbo/lru}/LRUCache.java (93%)
 rename logback-classic/src/test/java/ch/qos/logback/classic/{pattern => turbo/lru}/LRUCacheTest.java (95%)
 rename logback-classic/src/test/java/ch/qos/logback/classic/{pattern => turbo/lru}/Simulator.java (94%)
 rename logback-classic/src/test/java/ch/qos/logback/classic/{pattern => turbo}/lru/T_Entry.java (92%)
 rename logback-classic/src/test/java/ch/qos/logback/classic/{pattern => turbo}/lru/T_LRUCache.java (94%)


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