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High-Performance FIX Gateway
/*
* Copyright 2020 Monotonic Ltd.
*
* Licensed 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
*
* https://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 uk.co.real_logic.artio.fixp;
import io.aeron.logbuffer.ControlledFragmentHandler.Action;
import org.agrona.DirectBuffer;
import uk.co.real_logic.artio.library.NotAppliedResponse;
import uk.co.real_logic.artio.messages.DisconnectReason;
import static uk.co.real_logic.artio.ilink.ILink3ConnectionConfiguration.Builder;
/**
* This handler should be implemented by anyone using Artio to connect to binary FIXP protocols - such as CME's
* . Your application code
* will receive callbacks on these messages in response to business level messages. Artio handles session level
* messages itself.
*
* NB: This is an experimental API and is subject to change or potentially removal.
*/
public interface FixPConnectionHandler
{
/**
* Callback for receiving business messages.
*
* Note that the offset provided here is for the SBE message itself and doesn't include the header, but a user
* of this API can always assume that the header of the message exists before the message itself. So for example
* if you want to take the offset and length of the SBE message, including its MessageHeader and Simple Open
* Framing Header then you could do the following calculation on the offset and length parameters.
*
*
* final int encodedLength = b3.entrypoint.fixp.sbe.MessageHeaderDecoder.ENCODED_LENGTH +
* uk.co.real_logic.artio.fixp.SimpleOpenFramingHeader.SOFH_LENGTH;
* offset -= encodedLength;
* length += encodedLength;
*
*
* @param connection the connection receiving this message
* @param templateId the templateId of the SBE message that you have received.
* @param buffer the buffer containing the message.
* @param offset the offset within the buffer at which your message starts.
* @param blockLength the blockLength of the received message.
* @param version the sbe version of the protocol.
* @param possRetrans true of the possRetrans flag is set to true.
* @param messageHeader additional fields related to the message.
* @return an action to indicate the correct back pressure behaviour.
*/
Action onBusinessMessage(
FixPConnection connection,
int templateId,
DirectBuffer buffer,
int offset,
int blockLength,
int version,
boolean possRetrans,
FixPMessageHeader messageHeader);
/**
* Callback when Artio has received a NotApplied message. The {@link NotAppliedResponse} parameter can be used
* in order to get Artio to retransmit messages or use a Sequence message in order to fill the gap.
* @param connection the connection receiving this message
* @param fromSequenceNumber the fromSequenceNumber of the NotApplied message.
* @param msgCount the msgCount of the NotApplied message.
* @param response used to tell Artio how to respond to the NotApplied message.
* @return an action to indicate the correct back pressure behaviour.
*/
Action onNotApplied(
FixPConnection connection, long fromSequenceNumber, long msgCount, NotAppliedResponse response);
/**
* Callback when Artio has received a RetransmitReject message. This can be used for error logging or handling.
* @param connection the connection receiving this message
* @param reason the reason of the RetransmitReject message
* @param requestTimestamp the requestTimestamp of the RetransmitReject message
* @param errorCodes the errorCodes of the RetransmitReject message
* @return an action to indicate the correct back pressure behaviour.
*/
Action onRetransmitReject(
FixPConnection connection, String reason, long requestTimestamp, int errorCodes);
/**
* Callback when Artio has received a RetransmitRequest message. This can be used to reject retransmission
* attempts or to log errored requests.
*
* @param connection the connection receiving this message.
* @param retransmissionInfo provides information about the retransmission message and how to reject them.
* @return an action to indicate the correct back pressure behaviour.
*/
default Action onRetransmitRequest(
final FixPConnection connection, final RetransmissionInfo retransmissionInfo)
{
// default for backwards compatibility.
return Action.CONTINUE;
}
/**
* Callback triggered by a timeout on a retransmit request. See
* {@link Builder#retransmitNotificationTimeoutInMs(int)} for details.
*
* @param connection the connection that initiated the retransmit request.
* @return an action to indicate the correct back pressure behaviour.
*/
Action onRetransmitTimeout(FixPConnection connection);
/**
* Notifies an application when a sequence message is received. Normally applications would not need to implement
* this method or take any behaviour in response to a sequence message - Artio itself provides any session level
* protocol responses. This method just exposes the event to applications for debugging or certification purposes.
* @param connection the connection receiving this message
* @param nextSeqNo the next sequence number contained in the body of the sequence message.
* @return an action to indicate the correct back pressure behaviour.
*/
Action onSequence(FixPConnection connection, long nextSeqNo);
/**
* Callback when an error happens internally with the processing of a message in iLink3 that can't be handled
* through normal protocol means.
*
* @param connection the connection where this error has occurred.
* @param ex the exception corresponding to an error
* @return an action to indicate the correct back pressure behaviour.
*/
Action onError(FixPConnection connection, Exception ex);
/**
* Callback invoked when this connection is disconnected.
*
* @param connection the connection that was disconnected.
* @param reason the reason for the disconnection.
* @return an action to indicate the correct back pressure behaviour.
*/
Action onDisconnect(FixPConnection connection, DisconnectReason reason);
/**
* Callback invoked when this connection receives a FinishedSending message from a counter-party.
*
* No more business messages will be received from the counter-party after this point. If your application
* has no more messages to send then it should invoke connection.finishedSending() unless it has
* already called finishedSending() to start the process. Your application may continue to send
* messages until it has invoked that method.
*
* NB: implementing this method is strictly optional. Not all FIXP protocols (eg: iLink3) implement the finished
* sending / finished receiving mechanism for protocol finalization and this method won't be invoked in the case
* of those protocols.
*
* @param connection the connection that has received the FinishedSending message
* @return an action to indicate the correct back pressure behaviour.
*/
default Action onFinishedSending(final FixPConnection connection)
{
// Deliberately empty as it's optional for a FIXP protocol to implement this method.
return Action.CONTINUE;
}
}