[Java] Dynamic resource API in Java (#4824)

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

@@ -123,6 +123,21 @@ public final class Ray extends RayCall {
     return runtime;
   }
 
+  /**
+   * Update the resource for the specified client.
+   * Set the resource for the specific node.
+   */
+  public static void setResource(UniqueId nodeId, String resourceName, double capacity) {
+    runtime.setResource(resourceName, capacity, nodeId);
+  }
+
+  /**
+   * Set the resource for local node.
+   */
+  public static void setResource(String resourceName, double capacity) {
+    runtime.setResource(resourceName, capacity, UniqueId.NIL);
+  }
+
   /**
    * Get the runtime context.
    */

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

@@ -65,6 +65,15 @@ public interface RayRuntime {
    */
   void free(List<UniqueId> objectIds, boolean localOnly, boolean deleteCreatingTasks);
 
+  /**
+   * Set the resource for the specific node.
+   *
+   * @param resourceName The name of resource.
+   * @param capacity The capacity of the resource.
+   * @param nodeId The node that we want to set its resource.
+   */
+  void setResource(String resourceName, double capacity, UniqueId nodeId);
+
   /**
    * Invoke a remote function.
    *