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Add more session command related functions to Backend

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The class now allows simpler construction of session commands by
overloading the add_session_command with a version that accepts a const
reference to a shared pointer. This removes the need to copy the
references to the source buffer by calling gwbuf_clone.

Exposed the first session command as a const reference to allow
interaction with it. Currently, it is planned to be used to get the
session command position of each backend.
This commit is contained in:
Markus Mäkelä
2017-06-15 20:10:34 +03:00
parent 15ef274178
commit 1f31cfdfd7
2 changed files with 26 additions and 0 deletions
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15
include/maxscale/backend.hh
View File

@ -73,6 +73,7 @@ public:
* the session command is completed
*/
void add_session_command(GWBUF* buffer, uint64_t sequence);
void add_session_command(const SSessionCommand& sescmd);
/**
* @brief Mark the current session command as successfully executed
@ -90,6 +91,20 @@ public:
*/
size_t session_command_count() const;
/**
* @brief Get the first session command
*
* Returns the first session command in the list of session commands
* to be executed.
*
* This should only be called when at least one session command has been
* added to the backend. If no session commands have been added, behavior
* is undefined.
*
* @return The first session command
*/
const SSessionCommand& next_session_command() const;
/**
* @brief Get pointer to server reference
*

11
server/core/backend.cc
View File

@ -116,6 +116,11 @@ void Backend::add_session_command(GWBUF* buffer, uint64_t sequence)
m_session_commands.push_back(SSessionCommand(new SessionCommand(buffer, sequence)));
}
void Backend::add_session_command(const SSessionCommand& sescmd)
{
m_session_commands.push_back(sescmd);
}
uint64_t Backend::complete_session_command()
{
uint64_t rval = m_session_commands.front()->get_position();
@ -128,6 +133,12 @@ size_t Backend::session_command_count() const
return m_session_commands.size();
}
const SSessionCommand& Backend::next_session_command() const
{
ss_dassert(session_command_count() > 0);
return m_session_commands.front();
}
void Backend::clear_state(backend_state state)
{
if ((state & WAITING_RESULT) && (m_state & WAITING_RESULT))