Merge pull request #554 from xetorthio/jediscluster_multithread

Make JedisCluster multihread by improving connection handling

src/main/java/redis/clients/jedis/JedisClusterCommand.java

@@ -23,9 +23,10 @@ public abstract class JedisClusterCommand<T> {
 	this.redirections = maxRedirections;
     }
 
-    public abstract T execute();
+    public abstract T execute(Jedis connection);
 
     public T run(String key) {
+	Jedis connection = null;
 	try {
 
 	    if (key == null) {
@@ -35,16 +36,20 @@ public abstract class JedisClusterCommand<T> {
 		throw new JedisClusterMaxRedirectionsException(
 			"Too many Cluster redirections?");
 	    }
-	    connectionHandler.getConnectionFromSlot(JedisClusterCRC16
+	    connection = connectionHandler.getConnectionFromSlot(JedisClusterCRC16
 		    .getSlot(key));
 	    if (asking) {
 		// TODO: Pipeline asking with the original command to make it
 		// faster....
-		connectionHandler.getConnection().asking();
+		connection.asking();
 	    }
-	    return execute();
+	    return execute(connection);
 	} catch (JedisRedirectionException jre) {
 	    return handleRedirection(jre, key);
+	} finally {
+	    if (connection != null) {
+		connectionHandler.returnConnection(connection);
+	    }
 	}
     }
 

src/main/java/redis/clients/jedis/JedisClusterConnectionHandler.java

@@ -11,6 +11,13 @@ public abstract class JedisClusterConnectionHandler {
     protected Map<Integer, JedisPool> slots = new HashMap<Integer, JedisPool>();
 
     abstract Jedis getConnection();
+    
+    protected void returnConnection(Jedis connection) {
+	nodes.get(
+		connection.getClient().getHost()
+			+ connection.getClient().getPort()).returnResource(
+		connection);
+    }
 
     abstract Jedis getConnectionFromSlot(int slot);
 

src/main/java/redis/clients/jedis/JedisSlotBasedConnectionHandler.java

@@ -5,42 +5,26 @@ import java.util.Set;
 public class JedisSlotBasedConnectionHandler extends
 	JedisClusterConnectionHandler {
 
-    private Jedis currentConnection;
-
     public JedisSlotBasedConnectionHandler(Set<HostAndPort> nodes) {
 	super(nodes);
     }
 
     public Jedis getConnection() {
-	return currentConnection != null ? currentConnection
-		: getRandomConnection().getResource();
-    }
-
-    private void returnCurrentConnection() {
-	if (currentConnection != null) {
-	    nodes.get(
-		    currentConnection.getClient().getHost()
-			    + currentConnection.getClient().getPort())
-		    .returnResource(currentConnection);
-	}
-
+	return getRandomConnection().getResource();
     }
 
     @Override
     public void assignSlotToNode(int slot, HostAndPort targetNode) {
 	super.assignSlotToNode(slot, targetNode);
-	getConnectionFromSlot(slot);
     }
 
     @Override
     public Jedis getConnectionFromSlot(int slot) {
-	returnCurrentConnection();
 	JedisPool connectionPool = slots.get(slot);
 	if (connectionPool == null) {
 	    connectionPool = getRandomConnection();
 	}
-	currentConnection = connectionPool.getResource();
-	return currentConnection;
+	return connectionPool.getResource();
     }
 
 }

src/main/java/redis/clients/util/JedisClusterCRC16.java

@@ -2,7 +2,6 @@ package redis.clients.util;
 
 public class JedisClusterCRC16 {
     public final static int polynomial = 0x1021; // Represents x^16+x^12+x^5+1
-    static int crc;
     
 
     public static int getSlot(String key) {
@@ -17,7 +16,7 @@ public class JedisClusterCRC16 {
     }
 
     private static int getCRC16(String key) {
-	crc = 0x0000;
+	int crc = 0x0000;
 	for (byte b : key.getBytes()) {
 	    for (int i = 0; i < 8; i++) {
 		boolean bit = ((b >> (7 - i) & 1) == 1);