rpuch commented on code in PR #7019: URL: https://github.com/apache/ignite-3/pull/7019#discussion_r2583865395
########## modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/mv/AddWriteLinkingWiInvokeClosure.java: ########## @@ -0,0 +1,158 @@ +/* + * 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.storage.pagememory.mv; + +import static org.apache.ignite.internal.pagememory.util.PageIdUtils.NULL_LINK; + +import java.util.UUID; +import org.apache.ignite.internal.lang.IgniteInternalCheckedException; +import org.apache.ignite.internal.pagememory.freelist.FreeList; +import org.apache.ignite.internal.pagememory.tree.BplusTree; +import org.apache.ignite.internal.pagememory.tree.IgniteTree.InvokeClosure; +import org.apache.ignite.internal.schema.BinaryRow; +import org.apache.ignite.internal.storage.RowId; +import org.apache.ignite.internal.storage.StorageException; +import org.jetbrains.annotations.Nullable; + +/** + * Implementation of {@link InvokeClosure} for {@link AbstractPageMemoryMvPartitionStorage#addWrite(RowId, BinaryRow, UUID, int, int)} + * which additionally maintains links between write intents. + * + * <p>See {@link AbstractPageMemoryMvPartitionStorage} about synchronization. + * + * <p>Operation may throw {@link StorageException} which will cause form {@link BplusTree#invoke(Object, Object, InvokeClosure)}. + */ +class AddWriteLinkingWiInvokeClosure extends AddWriteInvokeClosure { + private final PersistentPageMemoryMvPartitionStorage persistentStorage; + + private final FreeList freeList; + + private long wiListHeadLink; + private long newWiListHeadLink; + + AddWriteLinkingWiInvokeClosure( + RowId rowId, + @Nullable BinaryRow row, + UUID txId, + int commitZoneId, + int commitPartitionId, + PersistentPageMemoryMvPartitionStorage storage + ) { + super(rowId, row, txId, commitZoneId, commitPartitionId, storage); + + persistentStorage = storage; + + freeList = storage.renewableState.freeList(); + } + + @Override + public void call(@Nullable VersionChain oldRow) throws IgniteInternalCheckedException { + wiListHeadLink = persistentStorage.lockWriteIntentListHead(); + newWiListHeadLink = wiListHeadLink; + + try { + super.call(oldRow); + } finally { + persistentStorage.updateWriteIntentListHeadAndUnlock(newWiListHeadLink); + } + } + + @Override + protected RowVersion insertFirstRowVersion() { + assert persistentStorage.writeIntentHeadIsLockedByCurrentThread(); + assert persistentStorage.writeIntentListHead() == wiListHeadLink + : "Expected WI list head link " + wiListHeadLink + " but was " + persistentStorage.writeIntentListHead(); + + WiLinkableRowVersion newVersion = insertRowVersion(NULL_LINK, wiListHeadLink, NULL_LINK); + + newWiListHeadLink = newVersion.link(); + + updateWiListLinks(newVersion); + + return newVersion; + } + + @Override + protected RowVersion insertAnotherRowVersion(VersionChain oldRow, @Nullable RowVersion existingWriteIntent) { + assert persistentStorage.writeIntentHeadIsLockedByCurrentThread(); + assert persistentStorage.writeIntentListHead() == wiListHeadLink + : "Expected WI list head link " + wiListHeadLink + " but was " + persistentStorage.writeIntentListHead(); + + boolean replacingExistingWriteIntent = oldRow.isUncommitted(); + assert replacingExistingWriteIntent == (existingWriteIntent != null); + + long newNextWiLink; + long newPrevWiLink; + if (replacingExistingWriteIntent) { + newNextWiLink = existingWriteIntent.operations().nextWriteIntentLink(wiListHeadLink); + newPrevWiLink = existingWriteIntent.operations().prevWriteIntentLink(); + } else { + newNextWiLink = wiListHeadLink; + newPrevWiLink = NULL_LINK; + } + + WiLinkableRowVersion newVersion = insertRowVersion(oldRow.newestCommittedLink(), newNextWiLink, newPrevWiLink); + + if (!replacingExistingWriteIntent) { + // Add our new version to the head of the WI list. + newWiListHeadLink = newVersion.link(); + } + + updateWiListLinks(newVersion); + + return newVersion; + } + + private WiLinkableRowVersion insertRowVersion(long nextLink, long nextWiLink, long prevWiLink) { + var rowVersion = new WiLinkableRowVersion(rowId, storage.partitionId, nextLink, nextWiLink, prevWiLink, row); + + storage.insertRowVersion(rowVersion); + + return rowVersion; + } + + private void updateWiListLinks(WiLinkableRowVersion newRowVersion) { + if (newRowVersion != null) { + if (newRowVersion.prevWriteIntentLink() != NULL_LINK) { + try { + freeList.updateDataRow(newRowVersion.prevWriteIntentLink(), UpdateNextWiLinkHandler.INSTANCE, newRowVersion.link()); Review Comment: We should at least think it through. 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