| /* |
| * 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.wal; |
| |
| import org.apache.ignite.internal.pagemem.wal.WALPointer; |
| import org.apache.ignite.internal.util.typedef.internal.S; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * File WAL pointer. |
| */ |
| public class FileWALPointer implements WALPointer, Comparable<FileWALPointer> { |
| /** Serial version uid. */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Pointer serialized size. */ |
| public static final int POINTER_SIZE = 16; |
| |
| /** Absolute WAL segment file index (incrementing counter) */ |
| private final long idx; |
| |
| /** */ |
| private final int fileOff; |
| |
| /** Written record length */ |
| private int len; |
| |
| /** |
| * @param idx Absolute WAL segment file index (incremental counter). |
| * @param fileOff Offset in file, from the beginning. |
| * @param len Record length. |
| */ |
| public FileWALPointer(long idx, int fileOff, int len) { |
| this.idx = idx; |
| this.fileOff = fileOff; |
| this.len = len; |
| } |
| |
| /** |
| * @return Absolute WAL segment file index . |
| */ |
| public long index() { |
| return idx; |
| } |
| |
| /** |
| * @return File offset. |
| */ |
| public int fileOffset() { |
| return fileOff; |
| } |
| |
| /** |
| * @return Record length. |
| */ |
| public int length() { |
| return len; |
| } |
| |
| /** |
| * @param len Record length. |
| */ |
| public void length(int len) { |
| this.len = len; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public FileWALPointer next() { |
| if (len == 0) |
| throw new IllegalStateException("Failed to calculate next WAL pointer " + |
| "(this pointer is a terminal): " + this); |
| |
| // Return a terminal pointer. |
| return new FileWALPointer(idx, fileOff + len, 0); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean equals(Object o) { |
| if (this == o) |
| return true; |
| |
| if (!(o instanceof FileWALPointer)) |
| return false; |
| |
| FileWALPointer that = (FileWALPointer)o; |
| |
| return idx == that.idx && fileOff == that.fileOff; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int hashCode() { |
| int res = (int)(idx ^ (idx >>> 32)); |
| |
| res = 31 * res + fileOff; |
| |
| return res; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public int compareTo(@NotNull FileWALPointer o) { |
| int res = Long.compare(idx, o.idx); |
| |
| return res == 0 ? Integer.compare(fileOff, o.fileOff) : res; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String toString() { |
| return S.toString(FileWALPointer.class, this); |
| } |
| } |