/*
 * 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.impl;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.concurrent.TimeUnit;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.CoreLoggerContexts;
import org.apache.logging.log4j.core.config.ConfigurationFactory;
import org.apache.logging.log4j.core.util.Constants;
import org.apache.logging.log4j.core.util.DummyNanoClock;
import org.apache.logging.log4j.core.util.SystemNanoClock;
import org.apache.logging.log4j.util.Strings;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import static org.junit.Assert.*;

public class Log4jLogEventNanoTimeTest {

    @BeforeClass
    public static void beforeClass() {
        System.setProperty(ConfigurationFactory.CONFIGURATION_FILE_PROPERTY,
                "NanoTimeToFileTest.xml");
    }

    @AfterClass
    public static void afterClass() {
        System.setProperty(Constants.LOG4J_CONTEXT_SELECTOR, Strings.EMPTY);
    }

    @Test
    public void testLog4jLogEventUsesNanoTimeClock() throws Exception {
        final File file = new File("target", "NanoTimeToFileTest.log");
        // System.out.println(f.getAbsolutePath());
        file.delete();
        final Logger log = LogManager.getLogger("com.foo.Bar");
        final long before = System.nanoTime();
        log.info("Use actual System.nanoTime()");
        assertTrue("using SystemNanoClock", Log4jLogEvent.getNanoClock() instanceof SystemNanoClock);

        final long DUMMYNANOTIME = 123;
        Log4jLogEvent.setNanoClock(new DummyNanoClock(DUMMYNANOTIME));
        log.info("Use dummy nano clock");
        assertTrue("using SystemNanoClock", Log4jLogEvent.getNanoClock() instanceof DummyNanoClock);
        
        CoreLoggerContexts.stopLoggerContext(file); // stop async thread

        final BufferedReader reader = new BufferedReader(new FileReader(file));
        final String line1 = reader.readLine();
        final String line2 = reader.readLine();
        // System.out.println(line1);
        // System.out.println(line2);
        reader.close();
        file.delete();

        assertNotNull("line1", line1);
        assertNotNull("line2", line2);
        final String[] line1Parts = line1.split(" AND ");
        assertEquals("Use actual System.nanoTime()", line1Parts[2]);
        assertEquals(line1Parts[0], line1Parts[1]);
        long loggedNanoTime = Long.parseLong(line1Parts[0]);
        assertTrue("used system nano time", loggedNanoTime - before < TimeUnit.SECONDS.toNanos(1));
        
        final String[] line2Parts = line2.split(" AND ");
        assertEquals("Use dummy nano clock", line2Parts[2]);
        assertEquals(String.valueOf(DUMMYNANOTIME), line2Parts[0]);
        assertEquals(String.valueOf(DUMMYNANOTIME), line2Parts[1]);
    }

}

@@ -2695,24 +2695,73 @@
 ad%0A%0A        
+String line1;%0A        String line2;%0A        try (
 final Buffer
@@ -2818,17 +2818,19 @@
 r(file))
-;
+) %7B
 %0A       
@@ -2826,36 +2826,27 @@
 ) %7B%0A        
-final String
+   
  line1 = rea
@@ -2869,28 +2869,19 @@
         
-final String
+   
  line2 =
@@ -2892,32 +2892,36 @@
 der.readLine();%0A
+    
         // Syste
@@ -2942,32 +2942,36 @@
 line1);%0A        
+  
+  
 // System.out.pr
@@ -2996,23 +2996,9 @@
     
-reader.close();
+%7D
 %0A   

Use try-with-resources.