| /* |
| * 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.cache.persistence.pagemem; |
| |
| import java.nio.ByteBuffer; |
| import org.apache.ignite.IgniteCheckedException; |
| import org.apache.ignite.internal.pagemem.FullPageId; |
| import org.apache.ignite.internal.processors.cache.persistence.PageStoreWriter; |
| import org.apache.ignite.internal.util.GridUnsafe; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Not thread safe and stateful class for page replacement of one page with write() delay. This allows to write page |
| * content without holding segment lock. Page data is copied into temp buffer during {@link #writePage(FullPageId, |
| * ByteBuffer, int)} and then sent to real implementation by {@link #finishReplacement()}. |
| */ |
| public class DelayedDirtyPageStoreWrite implements PageStoreWriter { |
| /** Real flush dirty page implementation. */ |
| private final PageStoreWriter flushDirtyPage; |
| |
| /** Page size. */ |
| private final int pageSize; |
| |
| /** Thread local with byte buffers. */ |
| private final ThreadLocal<ByteBuffer> byteBufThreadLoc; |
| |
| /** Replacing pages tracker, used to register & unregister pages being written. */ |
| private final DelayedPageReplacementTracker tracker; |
| |
| /** Full page id to be written on {@link #finishReplacement()} or null if nothing to write. */ |
| @Nullable private FullPageId fullPageId; |
| |
| /** Byte buffer with page data to be written on {@link #finishReplacement()} or null if nothing to write. */ |
| @Nullable private ByteBuffer byteBuf; |
| |
| /** Partition update tag to be used in{@link #finishReplacement()} or null if -1 to write. */ |
| private int tag = -1; |
| |
| /** |
| * @param flushDirtyPage real writer to save page to store. |
| * @param byteBufThreadLoc thread local buffers to use for pages copying. |
| * @param pageSize page size. |
| * @param tracker tracker to lock/unlock page reads. |
| */ |
| public DelayedDirtyPageStoreWrite( |
| PageStoreWriter flushDirtyPage, |
| ThreadLocal<ByteBuffer> byteBufThreadLoc, |
| int pageSize, |
| DelayedPageReplacementTracker tracker |
| ) { |
| this.flushDirtyPage = flushDirtyPage; |
| this.pageSize = pageSize; |
| this.byteBufThreadLoc = byteBufThreadLoc; |
| this.tracker = tracker; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void writePage(FullPageId fullPageId, ByteBuffer byteBuf, int tag) { |
| tracker.lock(fullPageId); |
| |
| ByteBuffer tlb = byteBufThreadLoc.get(); |
| |
| tlb.rewind(); |
| |
| long writeAddr = GridUnsafe.bufferAddress(tlb); |
| long origBufAddr = GridUnsafe.bufferAddress(byteBuf); |
| |
| GridUnsafe.copyMemory(origBufAddr, writeAddr, pageSize); |
| |
| this.fullPageId = fullPageId; |
| this.byteBuf = tlb; |
| this.tag = tag; |
| } |
| |
| /** |
| * Runs actual write if required. Method is 'no op' if there was no page selected for replacement. |
| * @throws IgniteCheckedException if write failed. |
| */ |
| public void finishReplacement() throws IgniteCheckedException { |
| if (byteBuf == null && fullPageId == null) |
| return; |
| |
| try { |
| flushDirtyPage.writePage(fullPageId, byteBuf, tag); |
| } |
| finally { |
| tracker.unlock(fullPageId); |
| |
| fullPageId = null; |
| byteBuf = null; |
| tag = -1; |
| } |
| } |
| } |