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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright (c) 2018-2019 AT&T Intellectual Property. All rights reserved.
* Copyright (c) 2018-2019 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.validation.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.Optional;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang.time.StopWatch;
public class LogReader {
private BufferedReader cachedReader;
private Path cachedLog;
public LogReader(String logDirectory, String logFilePrefix) throws IOException {
cachedReader = getReader(logDirectory, logFilePrefix);
}
private BufferedReader getReader(String logDirectory, String logFilePrefix) throws IOException {
BufferedReader reader = new BufferedReader(new FileReader(getLogFile(logDirectory, logFilePrefix)));
while (reader.readLine() != null) {
// Consume all lines
}
return reader;
}
/**
* @param logDirectory
* @return the most recently created log file.
* @throws IOException
*/
private File getLogFile(String logDirectory, String filenamePrefix) throws IOException {
Optional<Path> latestFilePath = Files.list(Paths.get(logDirectory))
.filter(f -> Files.isDirectory(f) == false //
&& f.getFileName().toString().startsWith(filenamePrefix)
&& !f.getFileName().toString().endsWith(".zip"))
.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();
}
/**
* Read newly appended lines from the log.
*
* @return new lines appended to the log file
* @throws IOException
*/
public String getNewLines() throws IOException {
StopWatch stopwatch = new StopWatch();
stopwatch.start();
while (!cachedReader.ready()) {
if (stopwatch.getTime() > TimeUnit.SECONDS.toMillis(10)) {
throw new IOException("Test took too long - waiting on " + cachedLog);
}
// 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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