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 org.opendaylight.controller.raft.journal;
18 import org.eclipse.jdt.annotation.NonNullByDefault;
19 import org.eclipse.jdt.annotation.Nullable;
22 * A reader of {@link RaftJournal} entries.
25 public interface EntryReader extends AutoCloseable {
27 * Returns the next reader index.
29 * @return The next reader index
34 * Try to move to the next binary data block.
36 * @param mapper callback to be invoked on binary data
37 * @return processed binary data, or {@code null}
39 <T> @Nullable T tryNext(FromByteBufMapper<T> mapper);
42 * Resets the reader to the start.
47 * Resets the reader to the given index.
49 * @param index the next index to read
51 void reset(long index);