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61 lines
2.3 KiB
Java
61 lines
2.3 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.testing;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import google.registry.util.FormattingLogger;
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import java.io.IOException;
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import java.util.concurrent.ExecutionException;
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import javax.annotation.concurrent.ThreadSafe;
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/** Utility class for getting system information in tests. */
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@ThreadSafe
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public final class SystemInfo {
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private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
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private static final LoadingCache<String, Boolean> hasCommandCache = CacheBuilder.newBuilder()
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.build(new CacheLoader<String, Boolean>() {
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@Override
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public Boolean load(String cmd) throws InterruptedException {
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try {
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Process pid = Runtime.getRuntime().exec(cmd);
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pid.getOutputStream().close();
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pid.waitFor();
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} catch (IOException e) {
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logger.warningfmt(e, "%s command not available", cmd);
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return false;
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}
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return true;
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}});
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/**
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* Returns {@code true} if system command can be run from path.
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*
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* <p><b>Warning:</b> The command is actually run! So there could be side-effects. You might
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* need to specify a version flag or something. Return code is ignored.
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*
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* <p>This result is a memoized. If multiple therads try to get the same result at once, the
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* heavy lifting will only be performed by the first thread and the rest will wait.
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*
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* @throws ExecutionException
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*/
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public static boolean hasCommand(String cmd) throws ExecutionException {
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return hasCommandCache.get(cmd);
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}
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}
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