svn merge -c 1577710 from trunk for HADOOP-10407. Fix the javac warnings in org.apache.hadoop.ipc package.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1577720 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -120,6 +120,9 @@ Release 2.4.0 - UNRELEASED
     HADOOP-10337 ConcurrentModificationException from
     MetricsDynamicMBeanBase.createMBeanInfo() (Liang Xie via stack)
 
+    HADOOP-10407. Fix the javac warnings in org.apache.hadoop.ipc package.
+    (szetszwo)
+
   BREAKDOWN OF HADOOP-10184 SUBTASKS AND RELATED JIRAS
 
     HADOOP-10185. FileSystem API for ACLs. (cnauroth)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/CallQueueManager.java

@@ -18,15 +18,13 @@
 
 package org.apache.hadoop.ipc;
 
-import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.atomic.AtomicReference;
-import java.util.concurrent.TimeUnit;
-
 import java.lang.reflect.Constructor;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-
 import org.apache.hadoop.conf.Configuration;
 
 /**
@@ -35,13 +33,19 @@ import org.apache.hadoop.conf.Configuration;
 public class CallQueueManager<E> {
   public static final Log LOG = LogFactory.getLog(CallQueueManager.class);
 
+  @SuppressWarnings("unchecked")
+  static <E> Class<? extends BlockingQueue<E>> convertQueueClass(
+      Class<?> queneClass, Class<E> elementClass) {
+    return (Class<? extends BlockingQueue<E>>)queneClass;
+  }
+  
   // Atomic refs point to active callQueue
   // We have two so we can better control swapping
   private final AtomicReference<BlockingQueue<E>> putRef;
   private final AtomicReference<BlockingQueue<E>> takeRef;
 
-  public CallQueueManager(Class backingClass, int maxQueueSize,
+  public CallQueueManager(Class<? extends BlockingQueue<E>> backingClass,
-    String namespace, Configuration conf) {
+      int maxQueueSize, String namespace, Configuration conf) {
     BlockingQueue<E> bq = createCallQueueInstance(backingClass,
       maxQueueSize, namespace, conf);
     this.putRef = new AtomicReference<BlockingQueue<E>>(bq);
@@ -49,15 +53,14 @@ public class CallQueueManager<E> {
     LOG.info("Using callQueue " + backingClass);
   }
 
-  @SuppressWarnings("unchecked")
+  private <T extends BlockingQueue<E>> T createCallQueueInstance(
-  private BlockingQueue<E> createCallQueueInstance(Class theClass, int maxLen,
+      Class<T> theClass, int maxLen, String ns, Configuration conf) {
-    String ns, Configuration conf) {
 
     // Used for custom, configurable callqueues
     try {
-      Constructor ctor = theClass.getDeclaredConstructor(int.class, String.class,
+      Constructor<T> ctor = theClass.getDeclaredConstructor(int.class, String.class,
         Configuration.class);
-      return (BlockingQueue<E>)ctor.newInstance(maxLen, ns, conf);
+      return ctor.newInstance(maxLen, ns, conf);
     } catch (RuntimeException e) {
       throw e;
     } catch (Exception e) {
@@ -65,8 +68,8 @@ public class CallQueueManager<E> {
 
     // Used for LinkedBlockingQueue, ArrayBlockingQueue, etc
     try {
-      Constructor ctor = theClass.getDeclaredConstructor(int.class);
+      Constructor<T> ctor = theClass.getDeclaredConstructor(int.class);
-      return (BlockingQueue<E>)ctor.newInstance(maxLen);
+      return ctor.newInstance(maxLen);
     } catch (RuntimeException e) {
       throw e;
     } catch (Exception e) {
@@ -74,8 +77,8 @@ public class CallQueueManager<E> {
 
     // Last attempt
     try {
-      Constructor ctor = theClass.getDeclaredConstructor();
+      Constructor<T> ctor = theClass.getDeclaredConstructor();
-      return (BlockingQueue<E>)ctor.newInstance();
+      return ctor.newInstance();
     } catch (RuntimeException e) {
       throw e;
     } catch (Exception e) {
@@ -117,7 +120,8 @@ public class CallQueueManager<E> {
    * Replaces active queue with the newly requested one and transfers
    * all calls to the newQ before returning.
    */
-  public synchronized void swapQueue(Class queueClassToUse, int maxSize,
+  public synchronized void swapQueue(
+      Class<? extends BlockingQueue<E>> queueClassToUse, int maxSize,
       String ns, Configuration conf) {
     BlockingQueue<E> newQ = createCallQueueInstance(queueClassToUse, maxSize,
       ns, conf);
@@ -143,7 +147,7 @@ public class CallQueueManager<E> {
    * This doesn't mean the queue might not fill up at some point later, but
    * it should decrease the probability that we lose a call this way.
    */
-  private boolean queueIsReallyEmpty(BlockingQueue q) {
+  private boolean queueIsReallyEmpty(BlockingQueue<?> q) {
     boolean wasEmpty = q.isEmpty();
     try {
       Thread.sleep(10);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java

@@ -541,7 +541,7 @@ public class Client {
     }
     
     private synchronized AuthMethod setupSaslConnection(final InputStream in2, 
-        final OutputStream out2) throws IOException, InterruptedException {
+        final OutputStream out2) throws IOException {
       // Do not use Client.conf here! We must use ConnectionId.conf, since the
       // Client object is cached and shared between all RPC clients, even those
       // for separate services.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java

@@ -18,6 +18,11 @@
 
 package org.apache.hadoop.ipc;
 
+import static org.apache.hadoop.ipc.RpcConstants.AUTHORIZATION_FAILED_CALL_ID;
+import static org.apache.hadoop.ipc.RpcConstants.CONNECTION_CONTEXT_CALL_ID;
+import static org.apache.hadoop.ipc.RpcConstants.CURRENT_VERSION;
+import static org.apache.hadoop.ipc.RpcConstants.PING_CALL_ID;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
@@ -75,8 +80,6 @@ import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.io.DataOutputBuffer;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.WritableUtils;
-import static org.apache.hadoop.ipc.RpcConstants.*;
-
 import org.apache.hadoop.ipc.ProtobufRpcEngine.RpcResponseMessageWrapper;
 import org.apache.hadoop.ipc.ProtobufRpcEngine.RpcResponseWrapper;
 import org.apache.hadoop.ipc.RPC.RpcInvoker;
@@ -467,17 +470,24 @@ public abstract class Server {
     return serviceAuthorizationManager;
   }
 
+  static Class<? extends BlockingQueue<Call>> getQueueClass(
+      String prefix, Configuration conf) {
+    String name = prefix + "." + CommonConfigurationKeys.IPC_CALLQUEUE_IMPL_KEY;
+    Class<?> queueClass = conf.getClass(name, LinkedBlockingQueue.class);
+    return CallQueueManager.convertQueueClass(queueClass, Call.class);
+  }
+
+  private String getQueueClassPrefix() {
+    return CommonConfigurationKeys.IPC_CALLQUEUE_NAMESPACE + "." + port;
+  }
+
   /*
    * Refresh the call queue
    */
   public synchronized void refreshCallQueue(Configuration conf) {
     // Create the next queue
-    String prefix = CommonConfigurationKeys.IPC_CALLQUEUE_NAMESPACE + "." +
+    String prefix = getQueueClassPrefix();
-      this.port;
+    callQueue.swapQueue(getQueueClass(prefix, conf), maxQueueSize, prefix, conf);
-    Class queueClassToUse = conf.getClass(prefix + "." +
-      CommonConfigurationKeys.IPC_CALLQUEUE_IMPL_KEY, LinkedBlockingQueue.class);
-
-    callQueue.swapQueue(queueClassToUse, maxQueueSize, prefix, conf);
   }
 
   /** A call queued for handling. */
@@ -1225,9 +1235,9 @@ public abstract class Server {
       Throwable cause = e;
       while (cause != null) {
         if (cause instanceof RetriableException) {
-          return (RetriableException) cause;
+          return cause;
         } else if (cause instanceof StandbyException) {
-          return (StandbyException) cause;
+          return cause;
         } else if (cause instanceof InvalidToken) {
           // FIXME: hadoop method signatures are restricting the SASL
           // callbacks to only returning InvalidToken, but some services
@@ -1297,7 +1307,7 @@ public abstract class Server {
     
     private RpcSaslProto processSaslMessage(RpcSaslProto saslMessage)
         throws IOException, InterruptedException {
-      RpcSaslProto saslResponse = null;
+      final RpcSaslProto saslResponse;
       final SaslState state = saslMessage.getState(); // required      
       switch (state) {
         case NEGOTIATE: {
@@ -1333,15 +1343,28 @@ public abstract class Server {
           // SIMPLE is a legit option above.  we will send no response
           if (authMethod == AuthMethod.SIMPLE) {
             switchToSimple();
+            saslResponse = null;
             break;
           }
           // sasl server for tokens may already be instantiated
           if (saslServer == null || authMethod != AuthMethod.TOKEN) {
             saslServer = createSaslServer(authMethod);
           }
-          // fallthru to process sasl token
+          saslResponse = processSaslToken(saslMessage);
+          break;
         }
         case RESPONSE: {
+          saslResponse = processSaslToken(saslMessage);
+          break;
+        }
+        default:
+          throw new SaslException("Client sent unsupported state " + state);
+      }
+      return saslResponse;
+    }
+
+    private RpcSaslProto processSaslToken(RpcSaslProto saslMessage)
+        throws SaslException {
       if (!saslMessage.hasToken()) {
         throw new SaslException("Client did not send a token");
       }
@@ -1351,15 +1374,9 @@ public abstract class Server {
             + " for processing by saslServer.evaluateResponse()");
       }
       saslToken = saslServer.evaluateResponse(saslToken);
-          saslResponse = buildSaslResponse(
+      return buildSaslResponse(
           saslServer.isComplete() ? SaslState.SUCCESS : SaslState.CHALLENGE,
           saslToken);
-          break;
-        }
-        default:
-          throw new SaslException("Client sent unsupported state " + state);
-      }
-      return saslResponse;
     }
 
     private void switchToSimple() {
@@ -2123,12 +2140,9 @@ public abstract class Server {
         CommonConfigurationKeys.IPC_SERVER_RPC_READ_CONNECTION_QUEUE_SIZE_DEFAULT);
 
     // Setup appropriate callqueue
-    String prefix = CommonConfigurationKeys.IPC_CALLQUEUE_NAMESPACE + "." +
+    final String prefix = getQueueClassPrefix();
-        this.port;
+    this.callQueue = new CallQueueManager<Call>(getQueueClass(prefix, conf),
-    Class queueClassToUse = conf.getClass(prefix + "." +
+        maxQueueSize, prefix, conf);
-        CommonConfigurationKeys.IPC_CALLQUEUE_IMPL_KEY, LinkedBlockingQueue.class);
-    this.callQueue = new CallQueueManager<Call>(queueClassToUse, maxQueueSize,
-      prefix, conf);
 
     this.secretManager = (SecretManager<TokenIdentifier>) secretManager;
     this.authorize = 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestCallQueueManager.java

@@ -18,22 +18,15 @@
 
 package org.apache.hadoop.ipc;
 
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.HashMap;
-import java.util.ArrayList;
-
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
-import org.junit.Assert;
+import java.util.ArrayList;
-import org.junit.Assume;
+import java.util.HashMap;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+
 import org.junit.Test;
-import org.junit.Before;
-import org.junit.After;
 
 public class TestCallQueueManager {
   private CallQueueManager<FakeCall> manager;
@@ -146,23 +139,26 @@ public class TestCallQueueManager {
   }
 
 
+  private static final Class<? extends BlockingQueue<FakeCall>> queueClass
+      = CallQueueManager.convertQueueClass(LinkedBlockingQueue.class, FakeCall.class);
+
   @Test
   public void testCallQueueCapacity() throws InterruptedException {
-    manager = new CallQueueManager<FakeCall>(LinkedBlockingQueue.class, 10, "", null);
+    manager = new CallQueueManager<FakeCall>(queueClass, 10, "", null);
 
     assertCanPut(manager, 10, 20); // Will stop at 10 due to capacity
   }
 
   @Test
   public void testEmptyConsume() throws InterruptedException {
-    manager = new CallQueueManager<FakeCall>(LinkedBlockingQueue.class, 10, "", null);
+    manager = new CallQueueManager<FakeCall>(queueClass, 10, "", null);
 
     assertCanTake(manager, 0, 1); // Fails since it's empty
   }
 
   @Test(timeout=60000)
   public void testSwapUnderContention() throws InterruptedException {
-    manager = new CallQueueManager<FakeCall>(LinkedBlockingQueue.class, 5000, "", null);
+    manager = new CallQueueManager<FakeCall>(queueClass, 5000, "", null);
 
     ArrayList<Putter> producers = new ArrayList<Putter>();
     ArrayList<Taker> consumers = new ArrayList<Taker>();
@@ -191,7 +187,7 @@ public class TestCallQueueManager {
     Thread.sleep(10);
 
     for (int i=0; i < 5; i++) {
-      manager.swapQueue(LinkedBlockingQueue.class, 5000, "", null);
+      manager.swapQueue(queueClass, 5000, "", null);
     }
 
     // Stop the producers