1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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1502.5.7
by Barry.Leslie at PrimeBase
Renamed the 'Event' plugin to 'EventObserver' plugin along with some internal class renames to make things clearer. |
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* Copyright (C) 2010 PrimeBase Technologies GmbH, Germany
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1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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1502.5.9
by Barry.Leslie at PrimeBase
- Cleaned up some style points. |
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*
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* Barry Leslie
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*
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* 2010-05-12
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1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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*/
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1502.5.6
by Barry.Leslie at PrimeBase
Fixed a compiler error due to an uninitialized variavble and cleaned up some coding standard stuff. |
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#include "config.h" |
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1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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#include <string> |
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#include <vector> |
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#include "drizzled/session.h" |
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#include "drizzled/table_list.h" |
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#include "drizzled/table_share.h" |
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1530.4.3
by Monty Taylor
Two more missed renames. |
32 |
#include "drizzled/module/registry.h" |
1502.5.7
by Barry.Leslie at PrimeBase
Renamed the 'Event' plugin to 'EventObserver' plugin along with some internal class renames to make things clearer. |
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#include "drizzled/plugin/event_observer.h" |
1502.5.9
by Barry.Leslie at PrimeBase
- Cleaned up some style points. |
34 |
#include <drizzled/util/functors.h> |
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#include <algorithm> |
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1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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using namespace std; |
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namespace drizzled |
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{
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namespace plugin |
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{
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1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
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/*============================*/
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1593
by Brian Aker
Merge in Barry. |
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// Basic plugin registration stuff.
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static vector<EventObserver *> all_event_plugins; |
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//---------
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bool EventObserver::addPlugin(EventObserver *handler) |
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{
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if (handler != NULL) |
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all_event_plugins.push_back(handler); |
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return false; |
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}
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//---------
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void EventObserver::removePlugin(EventObserver *handler) |
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{
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if (handler != NULL) |
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all_event_plugins.erase(find(all_event_plugins.begin(), all_event_plugins.end(), handler)); |
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}
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/*
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* The Event Observer list class in which plugins register which events they
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* are interested in.
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*
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* Each table share for example, will have one of these hung on it to store
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* a list off all event observers interested in it and which events they are
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* interested in.
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1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
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*/
|
1593
by Brian Aker
Merge in Barry. |
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class EventObserverList |
1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
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{
|
1593
by Brian Aker
Merge in Barry. |
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public: |
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typedef multimap<uint32_t, EventObserver *> ObserverMap; |
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private: |
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/* A list of lists indexed by event type. */
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vector<ObserverMap *> event_observer_lists; |
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public: |
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EventObserverList() |
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1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
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{
|
1593
by Brian Aker
Merge in Barry. |
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uint32_t i; |
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event_observer_lists.reserve(EventObserver::MAX_EVENT_COUNT); |
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for (i=0; i < EventObserver::MAX_EVENT_COUNT; i++) |
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{
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1502.5.9
by Barry.Leslie at PrimeBase
- Cleaned up some style points. |
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event_observer_lists[i]= NULL; |
1593
by Brian Aker
Merge in Barry. |
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}
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}
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~EventObserverList() |
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{
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clearAllObservers(); |
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}
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/* Add the observer to the observer list for the even, positioning it if required.
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*
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* Note: Event observers are storted in a multimap object so that the order in which
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* they are called can be sorted based on the requested position. Lookups are never done
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* on the multimap, once filled it is used as a vector.
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*/
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void addObserver(EventObserver *eventObserver, enum EventObserver::EventType event, int32_t position) |
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{
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uint32_t event_pos; |
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ObserverMap *observers; |
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observers= event_observer_lists[event]; |
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if (observers == NULL) |
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{
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observers= new ObserverMap(); |
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event_observer_lists[event]= observers; |
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}
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if (position == 0) |
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event_pos= INT32_MAX; // Set the event position to be in the middle. |
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else
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event_pos= (uint32_t) position; |
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/* If positioned then check if the position is already taken. */
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if (position) |
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{
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if (observers->find(event_pos) != observers->end()) |
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{
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errmsg_printf(ERRMSG_LVL_WARN, |
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_("EventObserverList::addEventObserver() Duplicate event position %d for event '%s' from EventObserver plugin '%s'"), |
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position, |
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EventObserver::eventName(event), |
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eventObserver->getName().c_str()); |
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}
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}
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observers->insert(pair<uint32_t, EventObserver *>(event_pos, eventObserver) ); |
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}
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/* Remove all observer from all lists. */
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void clearAllObservers() |
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{
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for_each(event_observer_lists.begin(), |
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event_observer_lists.end(), |
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DeletePtr()); |
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event_observer_lists.clear(); |
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}
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/* Get the observer list for an event type. Will return NULL if no observer exists.*/
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ObserverMap *getObservers(enum EventObserver::EventType event) |
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{
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return event_observer_lists[event]; |
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}
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};
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//---------
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/* registerEvent() is called from the event observer plugins to add themselves to
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* the event observer list to be notified when the specified event takes place.
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*/
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void EventObserver::registerEvent(EventObserverList &observers, EventType event, int32_t position) |
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{
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observers.addObserver(this, event, position); |
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}
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/*========================================================*/
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/* Table Event Observer handling: */
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/*========================================================*/
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//----------
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/* For each EventObserver plugin call its registerTableEventsDo() meathod so that it can
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* register what events, if any, it is interested in on this table.
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*/
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class RegisterTableEventsIterate : public unary_function<EventObserver *, void> |
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{
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TableShare &table_share; |
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EventObserverList &observers; |
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public: |
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RegisterTableEventsIterate(TableShare &table_share_arg, EventObserverList &observers_arg): |
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table_share(table_share_arg), observers(observers_arg) {} |
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inline result_type operator() (argument_type eventObserver) |
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{
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eventObserver->registerTableEventsDo(table_share, observers); |
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}
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};
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//----------
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/*
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* registerTableEvents() is called by drizzle to register all plugins that
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* may be interested in table events on the newly created TableShare object.
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*/
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void EventObserver::registerTableEvents(TableShare &table_share) |
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{
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if (all_event_plugins.empty()) |
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return; |
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EventObserverList *observers; |
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observers= table_share.getTableObservers(); |
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||
1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
205 |
if (observers == NULL) |
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{
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|
1593
by Brian Aker
Merge in Barry. |
207 |
observers= new EventObserverList(); |
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table_share.setTableObservers(observers); |
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}
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else
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1502.5.5
by Barry.Leslie at PrimeBase
Added the ability to position the order in which event observers are called |
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{
|
1593
by Brian Aker
Merge in Barry. |
212 |
/* Calling registerTableEvents() for a table that already has
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* events registered on it is probably a programming error.
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1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
214 |
*/
|
1593
by Brian Aker
Merge in Barry. |
215 |
observers->clearAllObservers(); |
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}
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for_each(all_event_plugins.begin(), all_event_plugins.end(), |
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RegisterTableEventsIterate(table_share, *observers)); |
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}
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//----------
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/* Cleanup before freeing the TableShare object. */
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void EventObserver::deregisterTableEvents(TableShare &table_share) |
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{
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if (all_event_plugins.empty()) |
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return; |
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EventObserverList *observers; |
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observers= table_share.getTableObservers(); |
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if (observers) |
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{
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table_share.setTableObservers(NULL); |
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observers->clearAllObservers(); |
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delete observers; |
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}
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}
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/*========================================================*/
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/* Schema Event Observer handling: */
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/*========================================================*/
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//----------
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/* For each EventObserver plugin call its registerSchemaEventsDo() meathod so that it can
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* register what events, if any, it is interested in on the schema.
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*/
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class RegisterSchemaEventsIterate : public unary_function<EventObserver *, void> |
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{
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const std::string &db; |
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EventObserverList &observers; |
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public: |
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RegisterSchemaEventsIterate(const std::string &db_arg, EventObserverList &observers_arg) : |
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db(db_arg), |
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observers(observers_arg){} |
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inline result_type operator() (argument_type eventObserver) |
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{
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eventObserver->registerSchemaEventsDo(db, observers); |
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}
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};
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//----------
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/*
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* registerSchemaEvents() is called by drizzle to register all plugins that
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* may be interested in schema events on the database.
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*/
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void EventObserver::registerSchemaEvents(Session &session, const std::string &db) |
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{
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if (all_event_plugins.empty()) |
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return; |
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EventObserverList *observers; |
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observers= session.getSchemaObservers(db); |
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if (observers == NULL) |
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{
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observers= new EventObserverList(); |
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session.setSchemaObservers(db, observers); |
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}
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for_each(all_event_plugins.begin(), all_event_plugins.end(), |
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RegisterSchemaEventsIterate(db, *observers)); |
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}
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//----------
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/* Cleanup before freeing the Session object. */
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void EventObserver::deregisterSchemaEvents(Session &session, const std::string &db) |
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{
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if (all_event_plugins.empty()) |
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return; |
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EventObserverList *observers; |
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observers= session.getSchemaObservers(db); |
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if (observers) |
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{
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session.setSchemaObservers(db, NULL); |
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observers->clearAllObservers(); |
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delete observers; |
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}
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}
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/*========================================================*/
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/* Session Event Observer handling: */
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/*========================================================*/
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//----------
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/* For each EventObserver plugin call its registerSessionEventsDo() meathod so that it can
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* register what events, if any, it is interested in on this session.
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*/
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class RegisterSessionEventsIterate : public unary_function<EventObserver *, void> |
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{
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Session &session; |
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EventObserverList &observers; |
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public: |
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RegisterSessionEventsIterate(Session &session_arg, EventObserverList &observers_arg) : |
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session(session_arg), observers(observers_arg) {} |
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inline result_type operator() (argument_type eventObserver) |
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327 |
{
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eventObserver->registerSessionEventsDo(session, observers); |
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329 |
}
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};
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332 |
//----------
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/*
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334 |
* registerSessionEvents() is called by drizzle to register all plugins that
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* may be interested in session events on the newly created session.
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*/
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void EventObserver::registerSessionEvents(Session &session) |
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{
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if (all_event_plugins.empty()) |
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return; |
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341 |
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342 |
EventObserverList *observers; |
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observers= session.getSessionObservers(); |
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345 |
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346 |
if (observers == NULL) |
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{
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observers= new EventObserverList(); |
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349 |
session.setSessionObservers(observers); |
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350 |
}
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351 |
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352 |
observers->clearAllObservers(); |
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353 |
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354 |
for_each(all_event_plugins.begin(), all_event_plugins.end(), |
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355 |
RegisterSessionEventsIterate(session, *observers)); |
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356 |
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357 |
}
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358 |
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359 |
//----------
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360 |
/* Cleanup before freeing the session object. */
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361 |
void EventObserver::deregisterSessionEvents(Session &session) |
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362 |
{
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363 |
if (all_event_plugins.empty()) |
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364 |
return; |
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365 |
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366 |
EventObserverList *observers; |
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367 |
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368 |
observers= session.getSessionObservers(); |
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369 |
||
370 |
if (observers) |
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371 |
{
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372 |
session.setSessionObservers(NULL); |
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373 |
observers->clearAllObservers(); |
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374 |
delete observers; |
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375 |
}
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376 |
}
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377 |
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378 |
||
379 |
/* Event observer list iterator: */
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380 |
//----------
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381 |
class EventIterate : public unary_function<pair<uint32_t, EventObserver *>, bool> |
|
382 |
{
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383 |
EventData &data; |
|
384 |
||
385 |
public: |
|
386 |
EventIterate(EventData &data_arg) : |
|
387 |
unary_function<pair<uint32_t, EventObserver *>, bool>(), |
|
388 |
data(data_arg) |
|
1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
389 |
{}
|
390 |
||
1593
by Brian Aker
Merge in Barry. |
391 |
inline result_type operator()(argument_type handler) |
1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
392 |
{
|
1593
by Brian Aker
Merge in Barry. |
393 |
bool result= handler.second->observeEventDo(data); |
394 |
if (result) |
|
395 |
{
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396 |
/* TRANSLATORS: The leading word "EventObserver" is the name
|
|
397 |
of the plugin api, and so should not be translated. */
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398 |
errmsg_printf(ERRMSG_LVL_ERROR, |
|
399 |
_("EventIterate event handler '%s' failed for event '%s'"), |
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400 |
handler.second->getName().c_str(), handler.second->eventName(data.event)); |
|
401 |
||
402 |
}
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403 |
return result; |
|
1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
404 |
}
|
1593
by Brian Aker
Merge in Barry. |
405 |
};
|
406 |
||
407 |
||
408 |
/*==========================================================*/
|
|
409 |
/* Generic meathods called by drizzle to notify all interested
|
|
410 |
* plugins of an event,
|
|
1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
411 |
*/
|
1593
by Brian Aker
Merge in Barry. |
412 |
|
413 |
// Call all event observers interested in the event.
|
|
414 |
bool EventData::callEventObservers() |
|
415 |
{
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|
416 |
EventObserverList::ObserverMap *eventObservers; |
|
417 |
||
418 |
eventObservers = observerList->getObservers(event); |
|
419 |
||
420 |
if (eventObservers == NULL) |
|
421 |
return false; // Nobody was interested in the event. :( |
|
422 |
||
423 |
/* Use find_if instead of foreach so that we can collect return codes */
|
|
424 |
EventObserverList::ObserverMap::iterator iter= |
|
425 |
find_if(eventObservers->begin(), eventObservers->end(), |
|
426 |
EventIterate(*this)); |
|
427 |
/* If iter is == end() here, that means that all of the plugins returned
|
|
428 |
* false, which in this case means they all succeeded. Since we want to
|
|
429 |
* return false on success, we return the value of the two being !=.
|
|
1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
430 |
*/
|
1593
by Brian Aker
Merge in Barry. |
431 |
return iter != eventObservers->end(); |
432 |
}
|
|
433 |
||
434 |
//--------
|
|
435 |
bool SessionEventData::callEventObservers() |
|
436 |
{
|
|
437 |
observerList= session.getSessionObservers(); |
|
438 |
||
439 |
return EventData::callEventObservers(); |
|
440 |
}
|
|
441 |
||
442 |
//--------
|
|
443 |
bool SchemaEventData::callEventObservers() |
|
444 |
{
|
|
1502.5.8
by Barry.Leslie at PrimeBase
- Changed names to match the drizzle naming convention. |
445 |
observerList= session.getSchemaObservers(db); |
1593
by Brian Aker
Merge in Barry. |
446 |
if (!observerList) |
447 |
{
|
|
448 |
EventObserver::registerSchemaEvents(session, db); |
|
449 |
observerList= session.getSchemaObservers(db); |
|
450 |
}
|
|
451 |
||
452 |
return EventData::callEventObservers(); |
|
453 |
}
|
|
454 |
||
455 |
//--------
|
|
456 |
bool TableEventData::callEventObservers() |
|
457 |
{
|
|
458 |
observerList= table.s->getTableObservers(); |
|
459 |
||
460 |
return EventData::callEventObservers(); |
|
461 |
}
|
|
462 |
||
463 |
/*==========================================================*/
|
|
464 |
/* Static meathods called by drizzle to notify interested plugins
|
|
465 |
* of a schema event,
|
|
466 |
*/
|
|
467 |
bool EventObserver::beforeDropTable(Session &session, TableIdentifier &table) |
|
468 |
{
|
|
469 |
if (all_event_plugins.empty()) |
|
470 |
return false; |
|
471 |
||
472 |
BeforeDropTableEventData eventData(session, table); |
|
473 |
return eventData.callEventObservers(); |
|
474 |
}
|
|
475 |
||
476 |
bool EventObserver::afterDropTable(Session &session, TableIdentifier &table, int err) |
|
477 |
{
|
|
478 |
if (all_event_plugins.empty()) |
|
479 |
return false; |
|
480 |
||
481 |
AfterDropTableEventData eventData(session, table, err); |
|
482 |
return eventData.callEventObservers(); |
|
483 |
}
|
|
484 |
||
485 |
bool EventObserver::beforeRenameTable(Session &session, TableIdentifier &from, TableIdentifier &to) |
|
486 |
{
|
|
487 |
if (all_event_plugins.empty()) |
|
488 |
return false; |
|
489 |
||
490 |
BeforeRenameTableEventData eventData(session, from, to); |
|
491 |
return eventData.callEventObservers(); |
|
492 |
}
|
|
493 |
||
494 |
bool EventObserver::afterRenameTable(Session &session, TableIdentifier &from, TableIdentifier &to, int err) |
|
495 |
{
|
|
496 |
if (all_event_plugins.empty()) |
|
497 |
return false; |
|
498 |
||
499 |
AfterRenameTableEventData eventData(session, from, to, err); |
|
500 |
return eventData.callEventObservers(); |
|
501 |
}
|
|
502 |
||
503 |
/*==========================================================*/
|
|
504 |
/* Static meathods called by drizzle to notify interested plugins
|
|
505 |
* of a table event,
|
|
506 |
*/
|
|
507 |
bool EventObserver::beforeInsertRecord(Table &table, unsigned char *buf) |
|
508 |
{
|
|
509 |
if (all_event_plugins.empty()) |
|
510 |
return false; |
|
511 |
||
512 |
BeforeInsertRecordEventData eventData(*(table.in_use), table, buf); |
|
513 |
return eventData.callEventObservers(); |
|
514 |
}
|
|
515 |
||
516 |
bool EventObserver::afterInsertRecord(Table &table, const unsigned char *buf, int err) |
|
517 |
{
|
|
518 |
if (all_event_plugins.empty()) |
|
519 |
return false; |
|
520 |
||
521 |
AfterInsertRecordEventData eventData(*(table.in_use), table, buf, err); |
|
522 |
return eventData.callEventObservers(); |
|
523 |
}
|
|
524 |
||
525 |
bool EventObserver::beforeDeleteRecord(Table &table, const unsigned char *buf) |
|
526 |
{
|
|
527 |
if (all_event_plugins.empty()) |
|
528 |
return false; |
|
529 |
||
530 |
BeforeDeleteRecordEventData eventData(*(table.in_use), table, buf); |
|
531 |
return eventData.callEventObservers(); |
|
532 |
}
|
|
533 |
||
534 |
bool EventObserver::afterDeleteRecord(Table &table, const unsigned char *buf, int err) |
|
535 |
{
|
|
536 |
if (all_event_plugins.empty()) |
|
537 |
return false; |
|
538 |
||
539 |
AfterDeleteRecordEventData eventData(*(table.in_use), table, buf, err); |
|
540 |
return eventData.callEventObservers(); |
|
541 |
}
|
|
542 |
||
543 |
bool EventObserver::beforeUpdateRecord(Table &table, const unsigned char *old_data, unsigned char *new_data) |
|
544 |
{
|
|
545 |
if (all_event_plugins.empty()) |
|
546 |
return false; |
|
547 |
||
548 |
BeforeUpdateRecordEventData eventData(*(table.in_use), table, old_data, new_data); |
|
549 |
return eventData.callEventObservers(); |
|
550 |
}
|
|
551 |
||
552 |
bool EventObserver::afterUpdateRecord(Table &table, const unsigned char *old_data, unsigned char *new_data, int err) |
|
553 |
{
|
|
554 |
if (all_event_plugins.empty()) |
|
555 |
return false; |
|
556 |
||
557 |
AfterUpdateRecordEventData eventData(*(table.in_use), table, old_data, new_data, err); |
|
558 |
return eventData.callEventObservers(); |
|
559 |
}
|
|
560 |
||
561 |
/*==========================================================*/
|
|
562 |
/* Static meathods called by drizzle to notify interested plugins
|
|
563 |
* of a session event,
|
|
564 |
*/
|
|
565 |
bool EventObserver::beforeCreateDatabase(Session &session, const std::string &db) |
|
566 |
{
|
|
567 |
if (all_event_plugins.empty()) |
|
568 |
return false; |
|
569 |
||
570 |
BeforeCreateDatabaseEventData eventData(session, db); |
|
571 |
return eventData.callEventObservers(); |
|
572 |
}
|
|
573 |
||
574 |
bool EventObserver::afterCreateDatabase(Session &session, const std::string &db, int err) |
|
575 |
{
|
|
576 |
if (all_event_plugins.empty()) |
|
577 |
return false; |
|
578 |
||
579 |
AfterCreateDatabaseEventData eventData(session, db, err); |
|
580 |
return eventData.callEventObservers(); |
|
581 |
}
|
|
582 |
||
583 |
bool EventObserver::beforeDropDatabase(Session &session, const std::string &db) |
|
584 |
{
|
|
585 |
if (all_event_plugins.empty()) |
|
586 |
return false; |
|
587 |
||
588 |
BeforeDropDatabaseEventData eventData(session, db); |
|
589 |
return eventData.callEventObservers(); |
|
590 |
}
|
|
591 |
||
592 |
bool EventObserver::afterDropDatabase(Session &session, const std::string &db, int err) |
|
593 |
{
|
|
594 |
if (all_event_plugins.empty()) |
|
595 |
return false; |
|
596 |
||
597 |
AfterDropDatabaseEventData eventData(session, db, err); |
|
598 |
return eventData.callEventObservers(); |
|
599 |
}
|
|
1502.5.3
by Barry.Leslie at PrimeBase
Added the source code for the events plugin. |
600 |
|
601 |
||
602 |
} /* namespace plugin */ |
|
603 |
} /* namespace drizzled */ |