scouter.server.db.kv.KeyValueStoreWriter.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.kv
import scouter.server.ShutdownManager
import scouter.server.db.io.RealDataFile
import scouter.server.db.kv.KeyValueStoreIndex.table
import scouter.util.{FileUtil, IClose, IShutdown, StringKeyLinkedMap}
object KeyValueStoreWriter {
val table = new StringKeyLinkedMap[KeyValueStoreWriter]()
ShutdownManager.add(new IShutdown() {
override def shutdown(): Unit = {
while (table.size() > 0) {
table.removeFirst().close();
}
}
})
def get(div: String): KeyValueStoreWriter = {
table.synchronized {
var reader = table.get(div);
if (reader != null) {
return reader
} else {
return null
}
}
}
def open(div: String, file: String): KeyValueStoreWriter = {
table.synchronized {
var reader = table.get(div);
if (reader == null) {
reader = new KeyValueStoreWriter(div, file);
table.put(div, reader);
}
return reader;
}
}
}
class KeyValueStoreWriter(div: String, file: String) extends IClose {
val out = new RealDataFile(file + ".kvdata")
def write(bytes: Array[Byte]): Long = {
this.synchronized {
val point = out.getOffset();
out.writeInt(bytes.length);
out.write(bytes);
out.flush();
return point;
}
}
override def close() {
KeyValueStoreWriter.table.synchronized {
KeyValueStoreWriter.table.remove(this.file)
FileUtil.close(out)
out == null
}
}
}