scouter.server.db.xlog.XLogDataReader.scala Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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.
*
*/
package scouter.server.db.xlog;
import java.io.File
import java.io.IOException
import java.io.RandomAccessFile
import java.util.Hashtable
import scouter.server.db.io.zip.GZipStore
import scouter.util.FileUtil
import scouter.util.IClose
import scouter.server.Configure
object XLogDataReader {
val table = new Hashtable[String, XLogDataReader]();
def open(date: String, file: String): XLogDataReader = {
table.synchronized {
var reader = table.get(file);
if (reader != null) {
reader.reference += 1;
} else {
reader = new XLogDataReader(date, file);
table.put(file, reader);
}
return reader;
}
}
}
class XLogDataReader(date: String, file: String) extends IClose {
var reference = 0;
val conf = Configure.getInstance()
var pointFile: RandomAccessFile = null
var gzip = conf.compress_xlog_enabled
val confFile = new File(file + ".service.conf");
if (confFile.exists()) {
var properties = FileUtil.readProperties(confFile);
this.gzip = "true".equalsIgnoreCase(properties.getProperty("compress_xlog_enabled", "" + conf.compress_xlog_enabled).trim());
}
val xlogFile = new File(file + ".service");
if (xlogFile.canRead()) {
this.pointFile = new RandomAccessFile(xlogFile, "r");
}
def read(point: Long): Array[Byte] = {
if (gzip) {
return GZipStore.getInstance().read(date, point);
}
if (pointFile == null)
return null;
try {
this.synchronized {
pointFile.seek(point);
val len = pointFile.readShort();
val buffer = new Array[Byte](len);
pointFile.read(buffer);
return buffer;
}
} catch {
case e: IOException =>
throw new RuntimeException(e);
}
}
override def close() {
XLogDataReader.table.synchronized {
if (this.reference == 0) {
XLogDataReader.table.remove(this.file);
pointFile = FileUtil.close(pointFile);
} else {
this.reference -= 1;
}
}
}
}