/* | |
* 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. | |
*/ | |
package org.apache.logging.log4j.core.util; | |
import java.util.Objects; | |
/** | |
* Creates the appropriate {@link NanoClock} instance for the current configuration. | |
*/ | |
public class NanoClockFactory { | |
/** | |
* Enum over the different kinds of nano clocks this factory can create. | |
*/ | |
public static enum Mode { | |
/** | |
* Creates dummy nano clocks that always return a fixed value. | |
*/ | |
Dummy { | |
@Override | |
public NanoClock createNanoClock() { | |
return new DummyNanoClock(); | |
} | |
}, | |
/** | |
* Creates real nano clocks which call {{System.nanoTime()}}. | |
*/ | |
System { | |
@Override | |
public NanoClock createNanoClock() { | |
return new SystemNanoClock(); | |
} | |
}, | |
; | |
public abstract NanoClock createNanoClock(); | |
} | |
private static volatile Mode mode = Mode.Dummy; | |
/** | |
* Returns a new {@code NanoClock} determined by the mode of this factory. | |
* | |
* @return the appropriate {@code NanoClock} for the factory mode | |
*/ | |
public static NanoClock createNanoClock() { | |
return mode.createNanoClock(); | |
} | |
/** | |
* Returns the factory mode. | |
* | |
* @return the factory mode that determines which kind of nano clocks this factory creates | |
*/ | |
public static Mode getMode() { | |
return mode; | |
} | |
/** | |
* Sets the factory mode. | |
* | |
* @param mode the factory mode that determines which kind of nano clocks this factory creates | |
*/ | |
public static void setMode(Mode mode) { | |
NanoClockFactory.mode = Objects.requireNonNull(mode, "mode must be non-null"); | |
} | |
} |