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It doesn't entirely make semantic sense, since the actual state of the SystemClock isn't being preserved, but it makes injection into serializable classes (e.g. mapreduces) much simpler, so it's worth doing. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=201755949
34 lines
1.3 KiB
Java
34 lines
1.3 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import java.io.Serializable;
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import javax.annotation.concurrent.ThreadSafe;
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import org.joda.time.DateTime;
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/**
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* A clock that tells the current time in milliseconds or nanoseconds.
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*
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* <p>Clocks are technically serializable because they are either a stateless wrapper around the
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* system clock, or for testing, are just a wrapper around a DateTime. This means that if you
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* serialize a clock and deserialize it elsewhere, you won't necessarily get the same time or time
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* zone -- what you will get is a functioning clock.
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*/
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@ThreadSafe
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public interface Clock extends Serializable {
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/** Returns current time in UTC timezone. */
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DateTime nowUtc();
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}
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