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206
java/memory/memory-core/src/main/java/org/apache/arrow/memory/AutoBufferLedger.java
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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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| package org.apache.arrow.memory; | ||
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| import sun.misc.Cleaner; | ||
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| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
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| /** | ||
| * An alternative implementation of {@link BufferLedger}. The reference is auto managed by JVM garbage collector | ||
| * comparing to {@link LegacyBufferLedger}. Explicit calls to reference management methods such as | ||
| * {@link #retain()} and {@link #release()} will be ignored. | ||
| * | ||
| * <p> | ||
| * Note when this implementation, the accurate release time of the underlying {@link AllocationManager} may become | ||
| * unpredictable because we are relying GC to do clean-up. As a result, it's recommended to specify very large | ||
| * allocation limit (e.g. {@link Integer#MAX_VALUE}) to the corresponding {@link BufferAllocator} to avoid | ||
| * unexpected allocation failures. | ||
| * </p> | ||
| * | ||
| * <p> | ||
| * Also, to let the GC be aware of these allocations when off-heap based | ||
| * {@link AllocationManager}s are used, it's required to also add the allocated sizes to JVM direct | ||
| * memory counter (which can be limited by specifying JVM option "-XX:MaxDirectMemorySize"). To | ||
| * achieve this one can simply set allocator's {@link AllocationListener} to | ||
| * {@link DirectAllocationListener}. | ||
| * JVM should ensure that garbage collection will be performed once total reservation reached the limit. | ||
| * </p> | ||
| */ | ||
| public class AutoBufferLedger extends BufferLedger { | ||
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| public static class Factory implements BufferLedger.Factory, AutoCloseable { | ||
| private AutoBufferLedger tail = null; | ||
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| @Override | ||
| public BufferLedger create(BufferAllocator allocator, AllocationManager allocationManager) { | ||
| return new AutoBufferLedger(allocator, allocationManager, this); | ||
| } | ||
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| private void link(AutoBufferLedger ledger) { | ||
| synchronized (this) { | ||
| if (ledger.next != null || ledger.prev != null) { | ||
| throw new IllegalStateException("already linked"); | ||
| } | ||
| if (tail == null) { | ||
| tail = ledger; | ||
| return; | ||
| } | ||
| tail.next = ledger; | ||
| ledger.prev = tail; | ||
| tail = ledger; | ||
| } | ||
| } | ||
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| private void unlink(AutoBufferLedger ledger) { | ||
| synchronized (this) { | ||
| if (ledger.next == ledger) { | ||
| return; | ||
| } | ||
| if (ledger.prev == ledger) { | ||
| throw new IllegalStateException(); | ||
| } | ||
| if (ledger == tail) { | ||
| tail = ledger.prev; | ||
| } | ||
| if (ledger.prev != null) { | ||
| ledger.prev.next = ledger.next; | ||
| } | ||
| if (ledger.next != null) { | ||
| ledger.next.prev = ledger.prev; | ||
| } | ||
| ledger.prev = ledger; | ||
| ledger.next = ledger; | ||
| } | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| synchronized (this) { | ||
| while (tail != null) { | ||
| final AutoBufferLedger tmp = tail.prev; | ||
| tail.destruct(); | ||
| tail = tmp; | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| public static Factory newFactory() { | ||
| return new Factory(); | ||
| } | ||
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| private volatile long lDestructionTime = 0; | ||
| private final AtomicInteger refCount = new AtomicInteger(0); | ||
| private final AtomicBoolean destructed = new AtomicBoolean(false); | ||
| private final Factory factory; | ||
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| private AutoBufferLedger prev = null; | ||
| private AutoBufferLedger next = null; | ||
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| AutoBufferLedger(BufferAllocator allocator, AllocationManager allocationManager, | ||
| Factory factory) { | ||
| super(allocator, allocationManager); | ||
| this.factory = factory; | ||
| factory.link(this); | ||
| } | ||
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| @Override | ||
| protected long getDestructionTime() { | ||
| return lDestructionTime; | ||
| } | ||
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| @Override | ||
| protected ReferenceManager newReferenceManager() { | ||
| reserve0(); | ||
| final ReferenceManager rm = new BaseReferenceManager(this); | ||
| Cleaner.create(rm, new LedgerDeallocator()); | ||
| return rm; | ||
| } | ||
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| @Override | ||
| public int getRefCount() { | ||
| return refCount.get(); | ||
| } | ||
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| @Override | ||
| protected void increment() { | ||
| // no-op | ||
| } | ||
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| @Override | ||
| public boolean release() { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public boolean release(int decrement) { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public void retain() { | ||
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| } | ||
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| @Override | ||
| public void retain(int increment) { | ||
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| } | ||
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| private void reserve0() { | ||
| if (refCount.getAndAdd(1) == 0) { | ||
| // no-op | ||
| } | ||
| } | ||
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| private void release0() { | ||
| if (refCount.addAndGet(-1) == 0) { | ||
| destruct(); | ||
| } | ||
| } | ||
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| private void destruct() { | ||
| if (!destructed.compareAndSet(false, true)) { | ||
| return; | ||
| } | ||
| synchronized (getAllocationManager()) { | ||
| final AllocationManager am = getAllocationManager(); | ||
| lDestructionTime = System.nanoTime(); | ||
| am.release(this); | ||
| } | ||
| factory.unlink(this); | ||
| } | ||
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| /** | ||
| * Release hook will be invoked by JVM cleaner. | ||
| * | ||
| * @see #newReferenceManager() | ||
| */ | ||
| private class LedgerDeallocator implements Runnable { | ||
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| private LedgerDeallocator() { | ||
| } | ||
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| @Override | ||
| public void run() { | ||
| release0(); | ||
| } | ||
| } | ||
| } |
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