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solr/core/src/java/org/apache/solr/core/RefCountBase.java
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|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package org.apache.solr.core; | ||
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| /* | ||
| * 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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| import org.apache.solr.core.RefCount; | ||
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| import java.io.Closeable; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
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| public abstract class RefCountBase implements RefCount, Closeable { | ||
| private final AtomicInteger refcount = new AtomicInteger(1); | ||
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| @Override | ||
| public int getRefCount() { | ||
| return refcount.get(); | ||
| } | ||
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| @Override | ||
| public int incref() { | ||
| // debug_incref(); | ||
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| int count; | ||
| while ((count = refcount.get()) > 0) { | ||
| if (refcount.compareAndSet(count, count+1)) { | ||
| return count+1; | ||
| } | ||
| } | ||
| throw new RuntimeException("Trying to incref freed native object " + this); | ||
| } | ||
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| @Override | ||
| public int decref() { | ||
| // debug_decref(); | ||
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| int count; | ||
| while ((count = refcount.get()) > 0) { | ||
| int newCount = count - 1; | ||
| if (refcount.compareAndSet(count, newCount)) { | ||
| if (newCount == 0) { | ||
| free(); | ||
| } | ||
| return newCount; | ||
| } | ||
| } | ||
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| throw new RuntimeException("Too many decrefs detected for native object " + this); | ||
| } | ||
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| @Override | ||
| public boolean tryIncref() { | ||
| // debug_incref(); | ||
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| int count; | ||
| while ((count = refcount.get()) > 0) { | ||
| if (refcount.compareAndSet(count, count+1)) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| @Override | ||
| public boolean tryDecref() { | ||
| // debug_decref(); | ||
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| int count; | ||
| while ((count = refcount.get()) > 0) { | ||
| int newCount = count - 1; | ||
| if (refcount.compareAndSet(count, newCount)) { | ||
| if (newCount == 0) { | ||
| free(); | ||
| } | ||
| return true; | ||
| } | ||
| } | ||
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| return false; | ||
| } | ||
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| protected abstract void free(); | ||
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| @Override // for Closeable | ||
| public void close() { | ||
| decref(); | ||
| } | ||
| } |
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