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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.facebook.presto.jdbc.internal.guava.base;

import com.facebook.presto.jdbc.internal.guava.annotations.Beta;
import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

/**
 * 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.
 *
 * 

Warning: this interface can only be used to measure elapsed time, not wall time. * * @author Kevin Bourrillion * @since 10.0 (mostly * source-compatible 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. */ @CanIgnoreReturnValue // TODO(kak): Consider removing this 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(); } }; }





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