spark.network.netty.FileClientHandler.java Source code

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Here is the source code for spark.network.netty.FileClientHandler.java

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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 spark.network.netty;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundByteHandlerAdapter;

abstract class FileClientHandler extends ChannelInboundByteHandlerAdapter {

    private FileHeader currentHeader = null;

    private volatile boolean handlerCalled = false;

    public boolean isComplete() {
        return handlerCalled;
    }

    public abstract void handle(ChannelHandlerContext ctx, ByteBuf in, FileHeader header);

    public abstract void handleError(String blockId);

    @Override
    public ByteBuf newInboundBuffer(ChannelHandlerContext ctx) {
        // Use direct buffer if possible.
        return ctx.alloc().ioBuffer();
    }

    @Override
    public void inboundBufferUpdated(ChannelHandlerContext ctx, ByteBuf in) {
        // get header
        if (currentHeader == null && in.readableBytes() >= FileHeader.HEADER_SIZE()) {
            currentHeader = FileHeader.create(in.readBytes(FileHeader.HEADER_SIZE()));
        }
        // get file
        if (in.readableBytes() >= currentHeader.fileLen()) {
            handle(ctx, in, currentHeader);
            handlerCalled = true;
            currentHeader = null;
            ctx.close();
        }
    }

}