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author | Yohann Roussel <yroussel@google.com> | 2014-03-19 16:25:37 +0100 |
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committer | Yohann Roussel <yroussel@google.com> | 2014-03-20 15:13:33 +0100 |
commit | 4eceb95409e844fdc33c9c706e1dc307bfd40303 (patch) | |
tree | ee9f4f3fc79f757c79081c336bce4f1782c6ccd8 /guava/src/com/google/common/base/Ticker.java | |
parent | 3d2402901b1a6462e2cf47a6fd09711f327961c3 (diff) | |
download | toolchain_jack-4eceb95409e844fdc33c9c706e1dc307bfd40303.zip toolchain_jack-4eceb95409e844fdc33c9c706e1dc307bfd40303.tar.gz toolchain_jack-4eceb95409e844fdc33c9c706e1dc307bfd40303.tar.bz2 |
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.java | 63 |
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 new file mode 100644 index 0000000..6c34aef --- /dev/null +++ b/guava/src/com/google/common/base/Ticker.java @@ -0,0 +1,63 @@ +/* + * 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(); + } + }; +} |