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1790914058
Runnable and Callable are both @FunctionalInterfaces. The difference is that Callable requires a return value whereas Runnable does not, so in situations where we don't care about a return value, rather than having to add an unnecessary 'return null;' at the end of the lambda, we can simply use a non-returning Runnable instead. Unfortunately, owing to legacy reasons, Runnable is not declared to throw checked exceptions whereas Callable is, so in situations where checked exceptions are thrown we still need to have a 'return null;' call at the end. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=172935400
34 lines
1 KiB
Java
34 lines
1 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.util.concurrent.Callable;
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/**
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* A functional interface for a version of {@link Callable} that returns no value.
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*/
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@FunctionalInterface
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public interface VoidCallable {
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void call() throws Exception;
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/** Returns the VoidCallable as a {@link Callable} that returns null. */
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public default Callable<Void> asCallable() {
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return () -> {
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call();
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return null;
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};
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}
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}
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