01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: */
19: package org.apache.openjpa.jdbc.meta.strats;
20:
21: import org.apache.openjpa.lib.util.TimestampHelper;
22:
23: /**
24: * Uses a timestamp for optimistic versioning with nanosecond
25: * precision.
26: *
27: * @author Albert Lee
28: */
29: public class NanoPrecisionTimestampVersionStrategy extends
30: TimestampVersionStrategy {
31:
32: public static final String ALIAS = "nano-timestamp";
33:
34: public String getAlias() {
35: return ALIAS;
36: }
37:
38: protected Object nextVersion(Object version) {
39: return TimestampHelper.getNanoPrecisionTimestamp();
40: }
41: }
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