Class DefaultHttp2ConnectionEncoder.FlowControlledData

java.lang.Object

io.netty.handler.codec.http2.DefaultHttp2ConnectionEncoder.FlowControlledBase

io.netty.handler.codec.http2.DefaultHttp2ConnectionEncoder.FlowControlledData

All Implemented Interfaces:

ChannelFutureListener, Http2RemoteFlowController.FlowControlled, GenericFutureListener<ChannelFuture>, java.util.EventListener

Enclosing class:

DefaultHttp2ConnectionEncoder

private final class DefaultHttp2ConnectionEncoder.FlowControlledData
extends DefaultHttp2ConnectionEncoder.FlowControlledBase

Wrap a DATA frame so it can be written subject to flow-control. Note that this implementation assumes it only writes padding once for the entire payload as opposed to writing it once per-frame. This makes the size() calculation deterministic thereby greatly simplifying the implementation.

If frame-splitting is required to fit within max-frame-size and flow-control constraints we ensure that the passed promise is not completed until last frame write.

Field Summary

Fields

Modifier and Type	Field	Description
private int	dataSize
private final CoalescingBufferQueue	queue

Fields inherited from class DefaultHttp2ConnectionEncoder.FlowControlledBase

endOfStream, padding, promise, stream

Fields inherited from interface ChannelFutureListener

CLOSE, CLOSE_ON_FAILURE, FIRE_EXCEPTION_ON_FAILURE

Constructor Summary

Constructors

Constructor	Description
FlowControlledData(Http2Stream stream, ByteBuf buf, int padding, boolean endOfStream, ChannelPromise promise)

Method Summary

Modifier and Type	Method	Description
void	error(ChannelHandlerContext ctx, java.lang.Throwable cause)	Called to indicate that an error occurred before this object could be completely written.
boolean	merge(ChannelHandlerContext ctx, Http2RemoteFlowController.FlowControlled next)	Merge the contents of the next message into this message so they can be written out as one unit.
int	size()	The size of the payload in terms of bytes applied to the flow-control window.
void	write(ChannelHandlerContext ctx, int allowedBytes)	Writes up to allowedBytes of the encapsulated payload to the stream.

Methods inherited from class DefaultHttp2ConnectionEncoder.FlowControlledBase

operationComplete, writeComplete

Methods inherited from class java.lang.Object

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

Field Details

queue

private final CoalescingBufferQueue queue

dataSize

private int dataSize

Constructor Details

FlowControlledData

FlowControlledData(Http2Stream stream,
 ByteBuf buf,
 int padding,
 boolean endOfStream,
 ChannelPromise promise)

Method Details

size

public int size()

Description copied from interface: Http2RemoteFlowController.FlowControlled

The size of the payload in terms of bytes applied to the flow-control window. Some payloads like HEADER frames have no cost against flow control and would return 0 for this value even though they produce a non-zero number of bytes on the wire. Other frames like DATA frames have both their payload and padding count against flow-control.

error

public void error(ChannelHandlerContext ctx,
 java.lang.Throwable cause)

Description copied from interface: Http2RemoteFlowController.FlowControlled

Called to indicate that an error occurred before this object could be completely written.

The Http2RemoteFlowController will make exactly one call to either this method or Http2RemoteFlowController.FlowControlled.writeComplete().

Parameters:

ctx - The context to use if any communication needs to occur as a result of the error. This may be null if an exception occurs when the connection has not been established yet.

cause - of the error.

write

public void write(ChannelHandlerContext ctx,
 int allowedBytes)

Description copied from interface: Http2RemoteFlowController.FlowControlled

Writes up to allowedBytes of the encapsulated payload to the stream. Note that a value of 0 may be passed which will allow payloads with flow-control size == 0 to be written. The flow-controller may call this method multiple times with different values until the payload is fully written, i.e it's size after the write is 0.

When an exception is thrown the Http2RemoteFlowController will make a call to Http2RemoteFlowController.FlowControlled.error(ChannelHandlerContext, Throwable).

Parameters:

ctx - The context to use for writing.

allowedBytes - an upper bound on the number of bytes the payload can write at this time.

merge

public boolean merge(ChannelHandlerContext ctx,
 Http2RemoteFlowController.FlowControlled next)

Description copied from interface: Http2RemoteFlowController.FlowControlled

Merge the contents of the next message into this message so they can be written out as one unit. This allows many small messages to be written as a single DATA frame.

Returns:

true if next was successfully merged and does not need to be enqueued, false otherwise.