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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.spark.network.netty
import io.netty.buffer._
import org.apache.spark.Logging
import org.apache.spark.storage.{BlockId, TestBlockId}
private[spark] class FileHeader (
val fileLen: Int,
val blockId: BlockId) extends Logging {
lazy val buffer: ByteBuf = {
val buf = Unpooled.buffer()
buf.capacity(FileHeader.HEADER_SIZE)
buf.writeInt(fileLen)
buf.writeInt(blockId.name.length)
blockId.name.foreach((x: Char) => buf.writeByte(x))
// padding the rest of header
if (FileHeader.HEADER_SIZE - buf.readableBytes > 0 ) {
buf.writeZero(FileHeader.HEADER_SIZE - buf.readableBytes)
} else {
throw new Exception("too long header " + buf.readableBytes)
logInfo("too long header")
}
buf
}
}
private[spark] object FileHeader {
val HEADER_SIZE = 40
def getFileLenOffset = 0
def getFileLenSize = Integer.SIZE/8
def create(buf: ByteBuf): FileHeader = {
val length = buf.readInt
val idLength = buf.readInt
val idBuilder = new StringBuilder(idLength)
for (i <- 1 to idLength) {
idBuilder += buf.readByte().asInstanceOf[Char]
}
val blockId = BlockId(idBuilder.toString())
new FileHeader(length, blockId)
}
def main(args:Array[String]) {
val header = new FileHeader(25, TestBlockId("my_block"))
val buf = header.buffer
val newHeader = FileHeader.create(buf)
System.out.println("id=" + newHeader.blockId + ",size=" + newHeader.fileLen)
}
}
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