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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.client;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import io.netty.buffer.ByteBuf;
import org.apache.spark.network.util.TransportFrameDecoder;
/**
* An interceptor that is registered with the frame decoder to feed stream data to a
* callback.
*/
class StreamInterceptor implements TransportFrameDecoder.Interceptor {
private final TransportResponseHandler handler;
private final String streamId;
private final long byteCount;
private final StreamCallback callback;
private long bytesRead;
StreamInterceptor(
TransportResponseHandler handler,
String streamId,
long byteCount,
StreamCallback callback) {
this.handler = handler;
this.streamId = streamId;
this.byteCount = byteCount;
this.callback = callback;
this.bytesRead = 0;
}
@Override
public void exceptionCaught(Throwable cause) throws Exception {
handler.deactivateStream();
callback.onFailure(streamId, cause);
}
@Override
public void channelInactive() throws Exception {
handler.deactivateStream();
callback.onFailure(streamId, new ClosedChannelException());
}
@Override
public boolean handle(ByteBuf buf) throws Exception {
int toRead = (int) Math.min(buf.readableBytes(), byteCount - bytesRead);
ByteBuffer nioBuffer = buf.readSlice(toRead).nioBuffer();
int available = nioBuffer.remaining();
callback.onData(streamId, nioBuffer);
bytesRead += available;
if (bytesRead > byteCount) {
RuntimeException re = new IllegalStateException(String.format(
"Read too many bytes? Expected %d, but read %d.", byteCount, bytesRead));
callback.onFailure(streamId, re);
handler.deactivateStream();
throw re;
} else if (bytesRead == byteCount) {
handler.deactivateStream();
callback.onComplete(streamId);
}
return bytesRead != byteCount;
}
}
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