scouter.server.db.obj.ObjectIndex.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.obj;
import java.io.IOException;
import java.util.Hashtable;
import scouter.server.db.io.IndexKeyFile;
import scouter.io.DataInputX;
import scouter.io.DataOutputX;
import scouter.util.FileUtil;
import scouter.util.IClose;
object ObjectIndex {
val table = new Hashtable[String, ObjectIndex]();
def open(file: String): ObjectIndex = {
table.synchronized {
var index = table.get(file);
if (index != null) {
index.refrence += 1;
return index;
} else {
index = new ObjectIndex(file);
table.put(file, index);
return index;
}
}
}
}
class ObjectIndex(_file: String) extends IClose {
val file = _file
var refrence = 0;
var index: IndexKeyFile = null
def set(key: Int, pos: Long) {
if (this.index == null) {
this.index = new IndexKeyFile(file);
}
this.index.put(DataOutputX.toBytes(key), DataOutputX.toBytes5(pos));
}
def get(key: Int): Long = {
if (this.index == null) {
this.index = new IndexKeyFile(file);
}
val buf = this.index.get(DataOutputX.toBytes(key));
if (buf == null) -1 else DataInputX.toLong5(buf, 0)
}
def delete(key: Int) {
if (this.index == null) {
this.index = new IndexKeyFile(file);
}
this.index.delete(DataOutputX.toBytes(key));
}
def read(handler: (Array[Byte], Array[Byte]) => Any, reader: (Long)=>Array[Byte]) {
if (this.index == null) {
this.index = new IndexKeyFile(file);
}
this.index.read(handler, reader);
}
override def close() {
ObjectIndex.table.synchronized {
if (this.refrence == 0) {
ObjectIndex.table.remove(this.file);
FileUtil.close(this.index);
this.index = null;
} else {
this.refrence -= 1;
}
}
}
}