Import code from internal repository to git

java/com/google/domain/registry/util/Sleeper.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.domain.registry.util;
+
+import org.joda.time.ReadableDuration;
+
+import javax.annotation.concurrent.ThreadSafe;
+
+/**
+ * An object which accepts requests to put the current thread to sleep.
+ *
+ * @see SystemSleeper
+ * @see com.google.domain.registry.testing.FakeSleeper
+ */
+@ThreadSafe
+public interface Sleeper {
+
+  /**
+   * Puts the current thread to sleep.
+   *
+   * @throws InterruptedException if this thread was interrupted
+   */
+  void sleep(ReadableDuration duration) throws InterruptedException;
+
+  /**
+   * Puts the current thread to sleep, ignoring interrupts.
+   *
+   * <p>If {@link InterruptedException} was caught, then {@code Thread.currentThread().interrupt()}
+   * will be called at the end of the {@code duration}.
+   *
+   * @see com.google.common.util.concurrent.Uninterruptibles#sleepUninterruptibly
+   */
+  void sleepUninterruptibly(ReadableDuration duration);
+}