[GitHub] [ignite] AMashenkov commented on a change in pull request #7071: IGNITE-12248: Apache Calcite based query execution engine.

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AMashenkov commented on a change in pull request #7071: IGNITE-12248: Apache Calcite based query execution engine.
URL: https://github.com/apache/ignite/pull/7071#discussion_r394839667
 
 

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 File path: modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/exec/ClosableIteratorsHolder.java
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 @@ -0,0 +1,164 @@
+/*
+ * 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.ignite.internal.processors.query.calcite.exec;
+
+import java.lang.ref.Reference;
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.internal.processors.query.calcite.util.Commons;
+import org.apache.ignite.internal.util.typedef.internal.U;
+
+/**
+ */
+@SuppressWarnings({"rawtypes", "unchecked"})
+public class ClosableIteratorsHolder {
+    /** */
+    private final ReferenceQueue refQueue;
+
+    /** */
+    private final Map<Reference, Object> refMap;
+
+    /** */
+    private final IgniteLogger log;
+
+    /** */
+    private volatile boolean stopped;
+
+    /** */
+    private Thread cleanWorker;
+
+    /** */
+    public ClosableIteratorsHolder(IgniteLogger log) {
+        this.log = log;
+
+        refQueue = new ReferenceQueue<>();
+        refMap = new ConcurrentHashMap<>();
+    }
+
+    /**
+     * @param src Closeable iterator.
+     * @return Weak closable iterator wrapper.
+     */
+    public <T> Iterator<T> iterator(final Iterator<T> src) {
+        cleanUp(false);
+
+        return new DelegatingIterator<>(src);
+    }
+
+    /** */
+    public void init() {
+        cleanWorker = new Thread(() -> cleanUp(true));
 
 Review comment:
   Let's use named-thread here or may be GridWorker.

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