[Java] Do not expose GcsClient to normal users (#4675)

java/api/src/main/java/org/ray/api/Ray.java

@@ -1,11 +1,10 @@
 package org.ray.api;
 
 import java.util.List;
-
-import org.ray.api.gcs.GcsClient;
 import org.ray.api.id.UniqueId;
 import org.ray.api.runtime.RayRuntime;
 import org.ray.api.runtime.RayRuntimeFactory;
+import org.ray.api.runtimecontext.RuntimeContext;
 
 /**
  * This class contains all public APIs of Ray.
@@ -130,11 +129,4 @@ public final class Ray extends RayCall {
   public static RuntimeContext getRuntimeContext() {
     return runtime.getRuntimeContext();
   }
-
-  /**
-   * Get gcs client.
-   */
-  public static GcsClient getGcsClient() {
-    return runtime.getGcsClient();
-  }
 }

java/api/src/main/java/org/ray/api/gcs/GcsClient.java

@@ -1,15 +0,0 @@
-package org.ray.api.gcs;
-
-import java.util.List;
-
-/**
- * The client used to interface with the GCS.
- */
-public interface GcsClient {
-
-  /**
-   * Get all node information in Ray cluster.
-   */
-  List<NodeInfo> getAllNodeInfo();
-
-}

java/api/src/main/java/org/ray/api/runtime/RayRuntime.java

@@ -4,13 +4,12 @@ import java.util.List;
 import org.ray.api.RayActor;
 import org.ray.api.RayObject;
 import org.ray.api.RayPyActor;
-import org.ray.api.RuntimeContext;
 import org.ray.api.WaitResult;
 import org.ray.api.function.RayFunc;
-import org.ray.api.gcs.GcsClient;
 import org.ray.api.id.UniqueId;
 import org.ray.api.options.ActorCreationOptions;
 import org.ray.api.options.CallOptions;
+import org.ray.api.runtimecontext.RuntimeContext;
 
 /**
  * Base interface of a Ray runtime.
@@ -132,6 +131,4 @@ public interface RayRuntime {
    */
   RayPyActor createPyActor(String moduleName, String className, Object[] args,
       ActorCreationOptions options);
-
-  GcsClient getGcsClient();
 }

java/api/src/main/java/org/ray/api/runtimecontext/NodeInfo.java

@@ -1,4 +1,4 @@
-package org.ray.api.gcs;
+package org.ray.api.runtimecontext;
 
 import java.util.Map;
 import org.ray.api.id.UniqueId;

java/api/src/main/java/org/ray/api/runtimecontext/RuntimeContext.java

@@ -1,5 +1,6 @@
-package org.ray.api;
+package org.ray.api.runtimecontext;
 
+import java.util.List;
 import org.ray.api.id.UniqueId;
 
 /**
@@ -43,4 +44,9 @@ public interface RuntimeContext {
    * Return true if Ray is running in single-process mode, false if Ray is running in cluster mode.
    */
   boolean isSingleProcess();
+
+  /**
+   * Get all node information in Ray cluster.
+   */
+  List<NodeInfo> getAllNodeInfo();
 }