add memcached cache benchmarking code

client/pom.xml

@@ -187,6 +187,11 @@
             <artifactId>easymock</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.caliper</groupId>
+            <artifactId>caliper</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

client/src/test/java/com/metamx/druid/client/cache/MemcachedCacheBrokerBenchmark.java

+package com.metamx.druid.client.cache;
+
+import com.google.caliper.Param;
+import com.google.caliper.Runner;
+import com.google.caliper.SimpleBenchmark;
+
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+
+public class MemcachedCacheBrokerBenchmark extends SimpleBenchmark
+{
+  private static final String BASE_KEY = "test_2012-11-26T00:00:00.000Z_2012-11-27T00:00:00.000Z_2012-11-27T04:11:25.979Z_";
+
+  private MemcachedCacheBroker broker;
+  private Cache cache;
+  private static byte[] randBytes;
+
+  // object size in kB
+  @Param({"1", "5", "10", "40"}) int objectSize;
+  @Param({"100", "1000"}) int objectCount;
+
+  @Override
+  protected void setUp() throws Exception
+  {
+    broker = MemcachedCacheBroker.create(
+        new MemcachedCacheBrokerConfig()
+        {
+          @Override
+          public int getExpiration()
+          {
+            // 1 year
+            return 3600 * 24 * 365;
+          }
+
+          @Override
+          public int getTimeout()
+          {
+            // 500 milliseconds
+            return 500;
+          }
+
+          @Override
+          public String getHosts()
+          {
+            return "localhost:11211";
+          }
+
+          @Override
+          public int getMaxObjectSize()
+          {
+            // 50 MB
+            return 50 * 1024 * 1024;
+          }
+        }
+    );
+
+    cache = broker.provideCache("default");
+
+
+    randBytes = new byte[objectSize * 1024];
+    new Random(0).nextBytes(randBytes);
+  }
+
+  @Override
+  protected void tearDown() throws Exception
+  {
+    broker.getClient().flush();
+    broker.getClient().shutdown();
+  }
+
+  public void timePutObjects(int reps) {
+    for(int i = 0; i < reps; ++i) {
+      for(int k = 0; k < objectCount; ++k) {
+        String key = BASE_KEY + i;
+        cache.put(key.getBytes(), randBytes);
+      }
+      broker.getClient().waitForQueues(1, TimeUnit.HOURS);
+    }
+  }
+
+  public byte[] timeGetObject(int reps) {
+    byte[] bytes = null;
+    for (int i = 0; i < reps; i++) {
+      for(int k = 0; k < objectCount; ++k) {
+        String key = BASE_KEY + i;
+        bytes = cache.get(key.getBytes());
+      }
+    }
+    return bytes;
+  }
+
+  public static void main(String[] args) throws Exception {
+    Runner.main(MemcachedCacheBrokerBenchmark.class, args);
+  }
+}

pom.xml

@@ -279,6 +279,13 @@
                 <version>4.8.1</version>
                 <scope>test</scope>
             </dependency>
+            <dependency>
+                <groupId>com.google.caliper</groupId>
+                <artifactId>caliper</artifactId>
+                <version>0.5-rc1</version>
+                <scope>test</scope>
+            </dependency>
+
         </dependencies>
     </dependencyManagement>
     <build>