| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| /* |
| * Copyright (C) 2011 The Guava Authors |
| */ |
| |
| package org.apache.ignite.internal.util; |
| |
| /** |
| * 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 IgniteStopwatch} instead of |
| * interacting with this class directly. |
| * |
| * <p><b>Warning:</b> this interface can only be used to measure elapsed time, not wall time. |
| */ |
| public abstract class IgniteTicker { |
| /** Constructor for use by subclasses. */ |
| protected IgniteTicker() {} |
| |
| /** 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}. |
| */ |
| public static IgniteTicker systemTicker() { |
| return SYSTEM_TICKER; |
| } |
| |
| /** System ticker. */ |
| private static final IgniteTicker SYSTEM_TICKER = |
| new IgniteTicker() { |
| @Override public long read() { |
| return System.nanoTime(); |
| } |
| }; |
| } |