hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MXS-2196: Allocate a session before allocating DCBs

Browse Source 
Allocating the session before a DCB guarantees that at no point will a DCB
have a null session. This further clarifies the concept of the session and
also allows the listener reference to be moved there.

Ideally, the session itself would allocate and assign the client DCB but
since the Listener is the only one who does it, it's acceptable for now.
This commit is contained in:
Markus Mäkelä
2018-12-03 19:25:26 +02:00
parent 692127a2cb
commit 43c33e9f4a
20 changed files with 106 additions and 115 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/maxscale/dcb.hh
View File

@ -29,8 +29,6 @@
#include <memory>
class SERVICE;
class Listener;
using SListener = std::shared_ptr<Listener>;
MXS_BEGIN_DECLS
@ -153,7 +151,7 @@ typedef enum
*/
struct DCB : public MXB_POLL_DATA
{
DCB(dcb_role_t role, const SListener& listener, SERVICE* service);
DCB(dcb_role_t role, MXS_SESSION*);
~DCB();
/**
@ -173,7 +171,6 @@ struct DCB : public MXB_POLL_DATA
size_t protocol_packet_length = 0; /**< protocol packet length */
size_t protocol_bytes_processed = 0; /**< How many bytes have been read */
MXS_SESSION* session; /**< The owning session */
SListener listener; /**< The origin of the connection */
MXS_PROTOCOL func = {}; /**< Protocol functions for the DCB */
MXS_AUTHENTICATOR authfunc = {}; /**< Authenticator functions for the DCB */
uint64_t writeqlen = 0; /**< Bytes in writeq */
@ -243,7 +240,7 @@ typedef enum
void dcb_global_init();
int dcb_write(DCB*, GWBUF*);
DCB* dcb_alloc(dcb_role_t, const SListener&, SERVICE* service);
DCB* dcb_alloc(dcb_role_t, MXS_SESSION*);
DCB* dcb_connect(struct server*, MXS_SESSION*, const char*);
int dcb_read(DCB*, GWBUF**, int);
int dcb_drain_writeq(DCB*);