scouter.server.db.span.ZipkinSpanDataReader.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.span
import java.io.{File, IOException, RandomAccessFile}
import java.util
import scouter.util.{FileUtil, IClose}
/**
* @author Gun Lee ([email protected]) on 27/10/2018
*/
object ZipkinSpanDataReader {
val table = new util.Hashtable[String, ZipkinSpanDataReader]();
def open(date: String, file: String): ZipkinSpanDataReader = {
table.synchronized {
var reader = table.get(file)
if (reader != null) {
reader.ref += 1
} else {
reader = new ZipkinSpanDataReader(date, file)
table.put(file, reader)
}
reader
}
}
}
class ZipkinSpanDataReader(date: String, file: String) extends IClose {
var ref = 0
var pointFile: RandomAccessFile = _
val dataFile = new File(file + ".data")
if (dataFile.canRead) {
this.pointFile = new RandomAccessFile(dataFile, "r")
}
def read(point: Long): Array[Byte] = {
if (pointFile == null) return null
try {
this.synchronized {
pointFile.seek(point)
val len = pointFile.readShort()
val buffer = new Array[Byte](len)
pointFile.read(buffer)
buffer
}
} catch {
case e: IOException =>
throw new RuntimeException(e);
}
}
override def close(): Unit = {
ZipkinSpanDataReader.table.synchronized {
if (this.ref == 0) {
ZipkinSpanDataReader.table.remove(this.file)
pointFile = FileUtil.close(pointFile)
} else {
this.ref -= 1
}
}
}
}