/*
* 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 java.io.File;
import java.io.FileInputStream;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.DefaultFileRegion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.spark.storage.BlockId;
import org.apache.spark.storage.FileSegment;
class FileServerHandler extends SimpleChannelInboundHandler<String> {
private static final Logger LOG = LoggerFactory.getLogger(FileServerHandler.class.getName());
private final PathResolver pResolver;
FileServerHandler(PathResolver pResolver){
this.pResolver = pResolver;
}
@Override
public void channelRead0(ChannelHandlerContext ctx, String blockIdString) {
BlockId blockId = BlockId.apply(blockIdString);
FileSegment fileSegment = pResolver.getBlockLocation(blockId);
// if getBlockLocation returns null, close the channel
if (fileSegment == null) {
//ctx.close();
return;
}
File file = fileSegment.file();
if (file.exists()) {
if (!file.isFile()) {
ctx.write(new FileHeader(0, blockId).buffer());
ctx.flush();
return;
}
long length = fileSegment.length();
if (length > Integer.MAX_VALUE || length <= 0) {
ctx.write(new FileHeader(0, blockId).buffer());
ctx.flush();
return;
}
int len = (int) length;
ctx.write((new FileHeader(len, blockId)).buffer());
try {
ctx.write(new DefaultFileRegion(new FileInputStream(file)
.getChannel(), fileSegment.offset(), fileSegment.length()));
} catch (Exception e) {
LOG.error("Exception: ", e);
}
} else {
ctx.write(new FileHeader(0, blockId).buffer());
}
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
LOG.error("Exception: ", cause);
ctx.close();
}
}