ibessonov commented on a change in pull request #566: URL: https://github.com/apache/ignite-3/pull/566#discussion_r789565478
########## File path: modules/page-memory/src/main/java/org/apache/ignite/internal/pagememory/PageSupport.java ########## @@ -0,0 +1,127 @@ +/* + * 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.pagememory; + +import org.apache.ignite.internal.pagememory.metric.IoStatisticsHolder; +import org.apache.ignite.lang.IgniteInternalCheckedException; + +/** + * Supports operations on pages. + */ +public interface PageSupport { + /** + * Returns the page absolute pointer associated with the given page ID. Each page obtained with this method must be released by calling + * {@link #releasePage(int, long, long)}. This method will allocate page with given ID if it doesn't exist. + * + * @param groupId Group ID. + * @param pageId Page ID. + * @return Page pointer. + * @throws IgniteInternalCheckedException If failed. + */ + public long acquirePage(int groupId, long pageId) throws IgniteInternalCheckedException; + + /** + * Returns the page absolute pointer associated with the given page ID. Each page obtained with this method must be released by calling + * {@link #releasePage(int, long, long)}. This method will allocate page with given ID if it doesn't exist. + * + * @param groupId Group ID. + * @param pageId Page ID. + * @param statHolder Statistics holder to track IO operations. + * @return Page pointer. + * @throws IgniteInternalCheckedException If failed. + */ + public long acquirePage(int groupId, long pageId, IoStatisticsHolder statHolder) throws IgniteInternalCheckedException; + + /** + * Releases page acquired by one of {@code acquirePage} methods. + * + * @param groupId Group ID. + * @param pageId Page ID to release. + * @param page Page pointer returned by the corresponding {@code acquirePage} call. + */ + public void releasePage(int groupId, long pageId, long page); + + /** + * Acquires a read lock on the page. + * + * @param groupId Group ID. + * @param pageId Page ID. + * @param page Page pointer. + * @return Pointer for reading the page or {@code 0} if page has been reused. + */ + public long readLock(int groupId, long pageId, long page); + + /** + * Obtains read lock without checking page tag. + * + * @param groupId Group ID. + * @param pageId Page ID. + * @param page Page pointer. + * @return Pointer for reading the page. + */ + public long readLockForce(int groupId, long pageId, long page); + + /** + * Releases locked page. Review comment: UB I suppose. Don't do that -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
