1 files changed, 58 insertions, 0 deletions
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectors/ResourcePoolSelector.java b/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectors/ResourcePoolSelector.java
new file mode 100644
index 000000000..f5dbf0db1
--- /dev/null
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectors/ResourcePoolSelector.java
@@ -0,0 +1,58 @@
+/*
+ * 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.resourcemgr.config.selectors;
+
+import org.apache.drill.exec.ops.QueryContext;
+
+/**
+ * Interface that defines implementation for selectors assigned to a ResourcePool. ResourcePoolSelector helps to
+ * evaluate if a given query can be admitted into a ResourcePool or not. Based on the assigned selector type to a
+ * ResourcePool it uses the query metadata with it's own configured values and make a decision for a query. The
+ * SelectorType defines all the supported ResourcePoolSelector which can be assigned to a ResourcePool. The
+ * configuration of a selector is of type:
+ * <code><pre>
+ * selector: {
+ *   SelectorType:SelectorValue
+ * }
+ * where SelectorValue can be a string (for SelectorType tag),
+ *       object (for SelectorType acl and not_equal) and
+ *       list of objects (for SelectorType and, or)
+ * when selector config is absent then a DefaultSelector is associated with the ResourcePool
+ * </pre></code>
+ */
+public interface ResourcePoolSelector {
+
+  enum SelectorType {
+    UNKNOWN,
+    DEFAULT,
+    TAG,
+    ACL,
+    OR,
+    AND,
+    NOT_EQUAL;
+
+    @Override
+    public String toString() {
+      return name().toLowerCase();
+    }
+  }
+
+  SelectorType getSelectorType();
+
+  boolean isQuerySelected(QueryContext queryContext);
+}