Import code from internal repository to git

javatests/com/google/domain/registry/testing/FakeSleeper.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.testing;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.domain.registry.util.Sleeper;
+
+import org.joda.time.ReadableDuration;
+
+import javax.annotation.concurrent.ThreadSafe;
+
+/** Sleeper implementation for unit tests that advances {@link FakeClock} rather than sleep. */
+@ThreadSafe
+public final class FakeSleeper implements Sleeper {
+
+  private final FakeClock clock;
+
+  public FakeSleeper(FakeClock clock) {
+    this.clock = checkNotNull(clock, "clock");
+  }
+
+  @Override
+  public void sleep(ReadableDuration duration) throws InterruptedException {
+    checkArgument(duration.getMillis() >= 0);
+    if (Thread.interrupted()) {
+      throw new InterruptedException();
+    }
+    clock.advanceBy(duration);
+  }
+
+  @Override
+  public void sleepUninterruptibly(ReadableDuration duration) {
+    checkArgument(duration.getMillis() >= 0);
+    clock.advanceBy(duration);
+  }
+}