1 files changed, 73 insertions, 0 deletions
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/NodeResource.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/NodeResource.java
new file mode 100644
index 000000000..ad7bc2e75
--- /dev/null
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/NodeResource.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.planner.cost;
+
+import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint;
+import java.util.Map;
+
+/**
+ * This class abstracts the resources like cpu and memory used up by the operators.
+ * In future network resources can also be incorporated if required.
+ */
+public class NodeResource {
+  private long cpu;
+  private long memory;
+
+  public NodeResource(long cpu, long memory) {
+    this.cpu = cpu;
+    this.memory = memory;
+  }
+
+  public void add(NodeResource other) {
+    if (other == null) {
+      return;
+    }
+    this.cpu += other.cpu;
+    this.memory += other.memory;
+  }
+
+  public long getMemory() {
+    return memory;
+  }
+
+  // A utility function to merge the node resources from one drillbit map to other drillbit map.
+  public static Map<DrillbitEndpoint, NodeResource> merge(Map<DrillbitEndpoint, NodeResource> to,
+                                                          Map<DrillbitEndpoint, NodeResource> from) {
+    to.entrySet().stream().forEach((toEntry) -> toEntry.getValue().add(from.get(toEntry.getKey())));
+    return to;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("CPU: ").append(cpu).append("Memory: ").append(memory);
+    return sb.toString();
+  }
+
+  public static NodeResource create() {
+    return create(0,0);
+  }
+
+  public static NodeResource create(long cpu) {
+    return create(cpu,0);
+  }
+
+  public static NodeResource create(long cpu, long memory) {
+    return new NodeResource(cpu, memory);
+  }
+}