2 * Copyright (c) 2024 PANTHEON.tech, s.r.o. and others. All rights reserved.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package io.atomix.storage.journal;
18 import io.netty.buffer.ByteBuf;
19 import org.eclipse.jdt.annotation.NonNullByDefault;
22 * A writer of {@link ByteBufJournal} entries.
25 public interface ByteBufWriter {
27 * Returns the last written index.
29 * @return The last written index
34 * Returns the next index to be written.
36 * @return The next index to be written
41 * Appends an entry to the journal.
43 * @param bytes Data block to append
44 * @return The index of appended data block
46 // FIXME: throws IOException
47 long append(ByteBuf bytes);
50 * Commits entries up to the given index.
52 * @param index The index up to which to commit entries.
54 void commit(long index);
57 * Resets the head of the journal to the given index.
59 * @param index the next index to write
60 * @throws IndexOutOfBoundsException if the journal cannot be reset to specified index
62 // FIXME: throws IOException
63 void reset(long index);
66 * Truncates the log to the given index.
68 * @param index The index to which to truncate the log.
69 * @throws IndexOutOfBoundsException if the journal cannot be reset to specified index
71 // FIXME: reconcile with reset()
72 // FIXME: throws IOException
73 void truncate(long index);
76 * Flushes written entries to disk.
78 // FIXME: throws IOException