org.apache.druid.frame.file

Class FrameFileHttpResponseHandler

java.lang.Object

org.apache.druid.frame.file.FrameFileHttpResponseHandler

All Implemented Interfaces:

HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>

public class FrameFileHttpResponseHandler
extends Object
implements HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>

An HttpResponseHandler that streams data into a ReadableByteChunksFrameChannel. It is not required that the request actually fetches an entire frame file. The return object for this handler, FrameFilePartialFetch, allows callers to tell how much of the file was read in a particular request. This handler implements backpressure through FrameFilePartialFetch.backpressureFuture(). This allows callers to back off from issuing the next request, if appropriate. However: the handler does not implement backpressure through the HttpResponseHandler.TrafficCop mechanism. Therefore, it is important that each request retrieve a modest amount of data. The last fetch must be empty (zero content bytes) and must have the header HEADER_LAST_FETCH_NAME set to HEADER_LAST_FETCH_VALUE. Under these conditions, FrameFilePartialFetch.isLastFetch() returns true.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.druid.java.util.http.client.response.HttpResponseHandler

HttpResponseHandler.TrafficCop

Field Summary

Fields

Modifier and Type	Field and Description
static String	HEADER_LAST_FETCH_NAME
static String	HEADER_LAST_FETCH_VALUE

Constructor Summary

Constructors

Constructor and Description
FrameFileHttpResponseHandler(ReadableByteChunksFrameChannel channel)

Method Summary

Modifier and Type	Method and Description
ClientResponse<FrameFilePartialFetch>	done(ClientResponse<FrameFilePartialFetch> clientResponse)
void	exceptionCaught(ClientResponse<FrameFilePartialFetch> clientResponse, Throwable e)
ClientResponse<FrameFilePartialFetch>	handleChunk(ClientResponse<FrameFilePartialFetch> clientResponse, org.jboss.netty.handler.codec.http.HttpChunk chunk, long chunkNum)
ClientResponse<FrameFilePartialFetch>	handleResponse(org.jboss.netty.handler.codec.http.HttpResponse response, HttpResponseHandler.TrafficCop trafficCop)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HEADER_LAST_FETCH_NAME

public static final String HEADER_LAST_FETCH_NAME

See Also:

Constant Field Values

HEADER_LAST_FETCH_VALUE

public static final String HEADER_LAST_FETCH_VALUE

See Also:

Constant Field Values

Constructor Detail

FrameFileHttpResponseHandler

public FrameFileHttpResponseHandler(ReadableByteChunksFrameChannel channel)

Method Detail

handleResponse

public ClientResponse<FrameFilePartialFetch> handleResponse(org.jboss.netty.handler.codec.http.HttpResponse response,
                                                            HttpResponseHandler.TrafficCop trafficCop)

Specified by:

handleResponse in interface HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>

handleChunk

public ClientResponse<FrameFilePartialFetch> handleChunk(ClientResponse<FrameFilePartialFetch> clientResponse,
                                                         org.jboss.netty.handler.codec.http.HttpChunk chunk,
                                                         long chunkNum)

Specified by:

handleChunk in interface HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>

done

public ClientResponse<FrameFilePartialFetch> done(ClientResponse<FrameFilePartialFetch> clientResponse)

Specified by:

done in interface HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>

exceptionCaught

public void exceptionCaught(ClientResponse<FrameFilePartialFetch> clientResponse,
                            Throwable e)

Specified by:

exceptionCaught in interface HttpResponseHandler<FrameFilePartialFetch,FrameFilePartialFetch>