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IGNITE-12602: Calcite integration. JDBC Thin driver support. This closes
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164 changes: 164 additions & 0 deletions
164
...ava/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. | ||
| */ | ||
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| package org.apache.ignite.internal.processors.query.calcite.exec; | ||
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| 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; | ||
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| /** | ||
| */ | ||
| @SuppressWarnings({"rawtypes", "unchecked"}) | ||
| public class ClosableIteratorsHolder { | ||
| /** */ | ||
| private final ReferenceQueue refQueue; | ||
|
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| /** */ | ||
| private final Map<Reference, Object> refMap; | ||
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| /** */ | ||
| private final IgniteLogger log; | ||
|
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| /** */ | ||
| private volatile boolean stopped; | ||
|
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| /** */ | ||
| private Thread cleanWorker; | ||
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| /** */ | ||
| public ClosableIteratorsHolder(IgniteLogger log) { | ||
| this.log = log; | ||
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| refQueue = new ReferenceQueue<>(); | ||
| refMap = new ConcurrentHashMap<>(); | ||
| } | ||
|
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| /** | ||
| * @param src Closeable iterator. | ||
| * @return Weak closable iterator wrapper. | ||
| */ | ||
| public <T> Iterator<T> iterator(final Iterator<T> src) { | ||
| cleanUp(false); | ||
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| return new DelegatingIterator<>(src); | ||
| } | ||
|
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| /** */ | ||
| public void init() { | ||
| cleanWorker = new Thread(() -> cleanUp(true)); | ||
| cleanWorker.setDaemon(true); | ||
| cleanWorker.start(); | ||
| } | ||
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| /** */ | ||
| public void tearDown() { | ||
| stopped = true; | ||
| refMap.clear(); | ||
| U.interrupt(cleanWorker); | ||
| } | ||
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| /** */ | ||
| private void cleanUp(boolean blocking) { | ||
| for (Reference<?> ref = nextRef(blocking); !stopped && ref != null; ref = nextRef(blocking)) | ||
| Commons.close(refMap.remove(ref), log); | ||
| } | ||
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| /** */ | ||
| private Reference nextRef(boolean blocking) { | ||
| try { | ||
| return !blocking ? refQueue.poll() : refQueue.remove(); | ||
| } | ||
| catch (InterruptedException ignored) { | ||
| return null; | ||
| } | ||
| } | ||
|
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| /** */ | ||
| private AutoCloseable closeable(Object referent, Object resource) { | ||
| if (!(resource instanceof AutoCloseable)) | ||
| return null; | ||
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| return new CloseableReference(referent, resource); | ||
| } | ||
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| /** */ | ||
| private final class DelegatingIterator<T> implements Iterator<T>, AutoCloseable { | ||
| /** */ | ||
| private final Iterator<T> delegate; | ||
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| /** */ | ||
| private final AutoCloseable closeable; | ||
|
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| /** */ | ||
| private DelegatingIterator(Iterator<T> delegate) { | ||
| closeable = closeable(this, this.delegate = delegate); | ||
| } | ||
|
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| /** {@inheritDoc} */ | ||
| @Override public boolean hasNext() { | ||
| return delegate.hasNext(); | ||
| } | ||
|
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| /** {@inheritDoc} */ | ||
| @Override public T next() { | ||
| return delegate.next(); | ||
| } | ||
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| /** {@inheritDoc} */ | ||
| @Override public void remove() { | ||
| delegate.remove(); | ||
| } | ||
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| /** {@inheritDoc} */ | ||
| @Override public void forEachRemaining(Consumer<? super T> action) { | ||
| delegate.forEachRemaining(action); | ||
| } | ||
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| /** {@inheritDoc} */ | ||
| @Override public void close() throws Exception { | ||
| Commons.close(closeable); | ||
| } | ||
| } | ||
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| /** */ | ||
| private final class CloseableReference extends WeakReference implements AutoCloseable { | ||
| /** */ | ||
| private CloseableReference(Object referent, Object resource) { | ||
| super(referent, refQueue); | ||
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| refMap.put(this, resource); | ||
| } | ||
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| /** {@inheritDoc} */ | ||
| @Override public void close() throws Exception { | ||
| try { | ||
| Commons.close(refMap.remove(this)); | ||
| } | ||
| finally { | ||
| clear(); | ||
| } | ||
| } | ||
| } | ||
| } |
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