1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.omid.transaction;
19
20 import org.apache.phoenix.thirdparty.com.google.common.base.Optional;
21
22 import java.io.IOException;
23
24 /**
25 * An behavior that needs to be implemented by transaction managers
26 * to try to locate the possible commit timestamp for a cell. It
27 * allows to the transaction managers implementing this interface to
28 * search the commit timestamp in a local cache of their own or in
29 * their particular shadow cells implementation.
30 */
31 public interface CommitTimestampLocator {
32
33 Optional<Long> readCommitTimestampFromCache(long startTimestamp);
34
35 Optional<Long> readCommitTimestampFromShadowCell(long startTimestamp) throws IOException;
36
37 }