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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 European Software Marketing Ltd.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.babel.logging;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.time.StopWatch;
import org.junit.Assert;
public class LogReader {
private Map<String, Path> cachedLogMap = new HashMap<>();
private Map<String, BufferedReader> readersMap = new HashMap<>();
private BufferedReader cachedReader;
public LogReader(String logDirectory, String logFilePrefix) throws IOException {
cachedReader = getReader(logDirectory, logFilePrefix);
}
private BufferedReader getReader(String logDirectory, String logFilePrefix) throws IOException {
BufferedReader reader = readersMap.get(logFilePrefix);
if (reader == null) {
reader = new BufferedReader(new FileReader(getLogFile(logDirectory, logFilePrefix)));
while (reader.readLine() != null) {
// Consume all lines
}
readersMap.put(logFilePrefix, reader);
}
return reader;
}
/**
* Find the most recently modified log file with a name starting with the specified prefix.
*
* @param logDirectory
* the root folder storing log files
* @param filenamePrefix
* the log file name prefix
* @return the most recently created log file
* @throws IOException
* if an I/O error occurs
*/
public File getLogFile(String logDirectory, String filenamePrefix) throws IOException {
Path cachedLog = cachedLogMap.get(filenamePrefix);
if (cachedLog == null) {
Optional<Path> latestFilePath = Files.list(Paths.get(logDirectory))
.filter(f -> Files.isDirectory(f) == false && f.getFileName().toString().startsWith(filenamePrefix))
.max(Comparator.comparingLong(f -> f.toFile().lastModified()));
if (latestFilePath.isPresent()) {
cachedLog = latestFilePath.get();
} else {
throw new IOException("No validation log files were found!");
}
}
return cachedLog.toFile();
}
/**
* Wait for and read new log entries.
*
* @return new lines appended to the log file
* @throws IOException
* If an I/O error occurs
*/
public String getNewLines() throws IOException {
StopWatch stopwatch = new StopWatch();
stopwatch.start();
while (!cachedReader.ready()) {
if (stopwatch.getTime() > TimeUnit.SECONDS.toMillis(30)) {
Assert.fail("Test took too long");
}
// else keep waiting
}
StringBuilder lines = new StringBuilder();
String line;
while ((line = cachedReader.readLine()) != null) {
lines.append(line).append(System.lineSeparator());
}
return lines.toString();
}
}
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