RRemoteService.getFreeWorkers method added

redisson/src/main/java/org/redisson/RedissonRemoteService.java

@@ -101,6 +101,12 @@ public class RedissonRemoteService extends BaseRemoteService implements RRemoteS
         }
     }
     
+    @Override
+    public int getFreeWorkers(Class<?> remoteInterface) {
+        Set<RFuture<RemoteServiceRequest>> futuresSet = futures.get(remoteInterface);
+        return futuresSet.size();
+    }
+    
     @Override
     public <T> void register(Class<T> remoteInterface, T object, int workers) {
         register(remoteInterface, object, workers, commandExecutor.getConnectionManager().getExecutor());

redisson/src/main/java/org/redisson/api/RRemoteService.java

@@ -57,6 +57,14 @@ import java.util.concurrent.TimeUnit;
  */
 public interface RRemoteService {
 
+    /**
+     * Returns free workers amount available for tasks 
+     * 
+     * @param remoteInterface - remote service interface
+     * @return workers amount
+     */
+    int getFreeWorkers(Class<?> remoteInterface);
+    
     /**
      * Register remote service with single worker
      *