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51298aeabb
This still retains the DnsWriter interface itself for better integration with Dagger and to preserve the option of having a DNS writer that does not have this requirement (e.g. because it is idempotent). This also makes the commit check thread-safe, which is a nice-to-have. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=168451114
36 lines
1.3 KiB
Java
36 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.dns.writer;
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import static com.google.common.base.Preconditions.checkState;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* A base implementation of {@link DnsWriter} that protects against multiple calls to commit().
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*/
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public abstract class BaseDnsWriter implements DnsWriter {
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private final AtomicBoolean committedAlready = new AtomicBoolean(false);
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@Override
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public final void commit() {
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checkState(committedAlready.compareAndSet(false, true), "commit() has already been called");
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commitUnchecked();
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}
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/** Commits DNS updates. This can never be called more than once. */
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protected abstract void commitUnchecked();
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}
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