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authorYohann Roussel <yroussel@google.com>2014-03-19 16:25:37 +0100
committerYohann Roussel <yroussel@google.com>2014-03-20 15:13:33 +0100
commit4eceb95409e844fdc33c9c706e1dc307bfd40303 (patch)
treeee9f4f3fc79f757c79081c336bce4f1782c6ccd8 /guava/src/com/google/common/base/Ticker.java
parent3d2402901b1a6462e2cf47a6fd09711f327961c3 (diff)
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Initial Jack import.
Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43
Diffstat (limited to 'guava/src/com/google/common/base/Ticker.java')
-rw-r--r--guava/src/com/google/common/base/Ticker.java63
1 files changed, 63 insertions, 0 deletions
diff --git a/guava/src/com/google/common/base/Ticker.java b/guava/src/com/google/common/base/Ticker.java
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+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * 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.common.base;
+
+import com.google.common.annotations.Beta;
+import com.google.common.annotations.GwtCompatible;
+
+/**
+ * A time source; returns a time value representing the number of nanoseconds elapsed since some
+ * fixed but arbitrary point in time. Note that most users should use {@link Stopwatch} instead of
+ * interacting with this class directly.
+ *
+ * <p><b>Warning:</b> this interface can only be used to measure elapsed time, not wall time.
+ *
+ * @author Kevin Bourrillion
+ * @since 10.0
+ * (<a href="http://code.google.com/p/guava-libraries/wiki/Compatibility"
+ * >mostly source-compatible</a> since 9.0)
+ */
+@Beta
+@GwtCompatible
+public abstract class Ticker {
+ /**
+ * Constructor for use by subclasses.
+ */
+ protected Ticker() {}
+
+ /**
+ * Returns the number of nanoseconds elapsed since this ticker's fixed
+ * point of reference.
+ */
+ public abstract long read();
+
+ /**
+ * A ticker that reads the current time using {@link System#nanoTime}.
+ *
+ * @since 10.0
+ */
+ public static Ticker systemTicker() {
+ return SYSTEM_TICKER;
+ }
+
+ private static final Ticker SYSTEM_TICKER = new Ticker() {
+ @Override
+ public long read() {
+ return Platform.systemNanoTime();
+ }
+ };
+}