refactoring

redisson/src/main/java/org/redisson/command/CommandBatchService.java

@@ -54,7 +54,7 @@ public class CommandBatchService extends CommandAsyncService {
     public static class ConnectionEntry {
 
         boolean firstCommand = true;
-        CompletableFuture<RedisConnection> connectionFuture;
+        volatile CompletableFuture<RedisConnection> connectionFuture;
         Runnable cancelCallback;
         
         public CompletableFuture<RedisConnection> getConnectionFuture() {

redisson/src/main/java/org/redisson/command/RedisQueuedBatchExecutor.java

@@ -37,6 +37,7 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
 
 /**
  * 
@@ -199,36 +200,30 @@ public class RedisQueuedBatchExecutor<V, R> extends BaseRedisBatchExecutor<V, R>
         }
     }
 
+    private static final AtomicReferenceFieldUpdater<ConnectionEntry, CompletableFuture> CONNECTION_LATCH =
+                                AtomicReferenceFieldUpdater.newUpdater(ConnectionEntry.class,
+                                                                        CompletableFuture.class, "connectionFuture");
+    
     @Override
     protected CompletableFuture<RedisConnection> getConnection() {
         MasterSlaveEntry msEntry = getEntry();
         ConnectionEntry entry = connections.computeIfAbsent(msEntry, k -> new ConnectionEntry());
 
-        if (entry.getConnectionFuture() != null) {
-            connectionFuture = entry.getConnectionFuture();
-            return connectionFuture;
-        }
-        
-        synchronized (this) {
-            if (entry.getConnectionFuture() != null) {
+        if (CONNECTION_LATCH.compareAndSet(entry, null, new CompletableFuture<>())) {
             connectionFuture = entry.getConnectionFuture();
-                return connectionFuture;
-            }
-
+            CompletableFuture<RedisConnection> cf;
             if (this.options.getExecutionMode() == ExecutionMode.REDIS_WRITE_ATOMIC) {
-                connectionFuture = connectionWriteOp(null);
+                cf = connectionWriteOp(null);
             } else {
-                connectionFuture = connectionReadOp(null);
+                cf = connectionReadOp(null);
             }
-            connectionFuture.toCompletableFuture().join();
-            entry.setConnectionFuture(connectionFuture);
+            connectionManager.getServiceManager().transfer(cf, connectionFuture);
 
             entry.setCancelCallback(() -> {
                 handleError(connectionFuture, new CancellationException());
             });
-
-            return connectionFuture;
         }
+        return entry.getConnectionFuture();
     }
 
     private MasterSlaveEntry getEntry() {

redisson/src/main/java/org/redisson/connection/ServiceManager.java

@@ -408,4 +408,15 @@ public class ServiceManager {
         });
     }
 
+    public <V> void transfer(CompletionStage<V> future1, CompletableFuture<V> future2) {
+        future1.whenComplete((res, e) -> {
+            if (e != null) {
+                future2.completeExceptionally(e);
+                return;
+            }
+
+            future2.complete(res);
+        });
+    }
+
 }

redisson/src/main/java/org/redisson/jcache/JCacheManager.java

@@ -22,6 +22,7 @@ import java.util.HashSet;
 import java.util.Properties;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import javax.cache.Cache;
 import javax.cache.CacheException;
@@ -52,17 +53,17 @@ import org.redisson.jcache.configuration.RedissonConfiguration;
 public class JCacheManager implements CacheManager {
 
     private static final EmptyStatisticsMXBean EMPTY_INSTANCE = new EmptyStatisticsMXBean();
-    private static MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
+    private static final MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
     
     private final ClassLoader classLoader;
     private final CachingProvider cacheProvider;
     private final Properties properties;
     private final URI uri;
-    private final ConcurrentMap<String, JCache<?, ?>> caches = new ConcurrentHashMap<String, JCache<?, ?>>();
-    private final ConcurrentMap<JCache<?, ?>, JCacheStatisticsMXBean> statBeans = new ConcurrentHashMap<JCache<?, ?>, JCacheStatisticsMXBean>();
-    private final ConcurrentMap<JCache<?, ?>, JCacheManagementMXBean> managementBeans = new ConcurrentHashMap<JCache<?, ?>, JCacheManagementMXBean>();
+    private final ConcurrentMap<String, JCache<?, ?>> caches = new ConcurrentHashMap<>();
+    private final ConcurrentMap<JCache<?, ?>, JCacheStatisticsMXBean> statBeans = new ConcurrentHashMap<>();
+    private final ConcurrentMap<JCache<?, ?>, JCacheManagementMXBean> managementBeans = new ConcurrentHashMap<>();
     
-    private volatile boolean closed;
+    private final AtomicBoolean closed = new AtomicBoolean();
     
     private final Redisson redisson;
     
@@ -96,7 +97,7 @@ public class JCacheManager implements CacheManager {
     }
 
     private void checkNotClosed() {
-        if (closed) {
+        if (closed.get()) {
             throw new IllegalStateException();
         }
     }
@@ -130,7 +131,7 @@ public class JCacheManager implements CacheManager {
         }
         
         JCacheConfiguration<K, V> cfg = new JCacheConfiguration<K, V>(configuration);
-        JCache<K, V> cache = new JCache<K, V>(this, cacheRedisson, cacheName, cfg, hasOwnRedisson);
+        JCache<K, V> cache = new JCache<>(this, cacheRedisson, cacheName, cfg, hasOwnRedisson);
         JCache<?, ?> oldCache = caches.putIfAbsent(cacheName, cache);
         if (oldCache != null) {
             throw new CacheException("Cache " + cacheName + " already exists");
@@ -188,7 +189,7 @@ public class JCacheManager implements CacheManager {
 
     @Override
     public Iterable<String> getCacheNames() {
-        return Collections.unmodifiableSet(new HashSet<String>(caches.keySet()));
+        return Collections.unmodifiableSet(new HashSet<>(caches.keySet()));
     }
 
     @Override
@@ -350,12 +351,7 @@ public class JCacheManager implements CacheManager {
 
     @Override
     public void close() {
-        if (isClosed()) {
-            return;
-        }
-
-        synchronized (this) {
-            if (!isClosed()) {
+        if (closed.compareAndSet(false, true)) {
             if (cacheProvider != null) {
                 cacheProvider.close(uri, classLoader);
             }
@@ -369,14 +365,12 @@ public class JCacheManager implements CacheManager {
             if (redisson != null) {
                 redisson.shutdown();
             }
-                closed = true;
-            }
         }
     }
 
     @Override
     public boolean isClosed() {
-        return closed;
+        return closed.get();
     }
 
     @Override