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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "Publisher.h"
#include "SubscriberInfo.h"
#include "PublisherDefinitionRegistry.h"
#include "Player.h"
#include "../base/Exception.h"
#include "../base/StringHelper.h"
using namespace std;
namespace avg {
int Publisher::s_LastSubscriberID = 0;
Publisher::Publisher()
{
m_pPublisherDef = PublisherDefinition::create("");
}
Publisher::Publisher(const string& sTypeName)
{
m_pPublisherDef = PublisherDefinitionRegistry::get()->getDefinition(sTypeName);
vector<MessageID> messageIDs = m_pPublisherDef->getMessageIDs();
for (unsigned i=0; i<messageIDs.size(); ++i) {
m_SignalMap[messageIDs[i]] = list<SubscriberInfoPtr>();
}
}
Publisher::~Publisher()
{
}
int Publisher::subscribe(MessageID messageID, const py::object& callable)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
int subscriberID = s_LastSubscriberID;
s_LastSubscriberID++;
// cerr << this << " subscribe " << messageID << ", " << subscriberID << endl;
subscribers.push_front(SubscriberInfoPtr(new SubscriberInfo(subscriberID, callable)));
return subscriberID;
}
void Publisher::unsubscribe(MessageID messageID, int subscriberID)
{
// cerr << this << " unsubscribe " << messageID << ", " << subscriberID << endl;
// cerr << " ";
// dumpSubscribers(messageID);
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
SubscriberInfoList::iterator it;
for (it = subscribers.begin(); it != subscribers.end(); it++) {
if ((*it)->getID() == subscriberID) {
unsubscribeIterator(messageID, it);
return;
}
}
// cerr << " End of unsubscribe: ";
// dumpSubscribers(messageID);
throwSubscriberNotFound(messageID, subscriberID);
}
void Publisher::unsubscribe1(int subscriberID)
{
SignalMap::iterator it;
for (it = m_SignalMap.begin(); it != m_SignalMap.end(); ++it) {
SubscriberInfoList& subscribers = it->second;
SubscriberInfoList::iterator it2;
for (it2 = subscribers.begin(); it2 != subscribers.end(); it2++) {
if ((*it2)->getID() == subscriberID) {
MessageID messageID = it->first;
unsubscribeIterator(messageID, it2);
return;
}
}
}
throw Exception(AVG_ERR_INVALID_ARGS,
"Subscriber with ID "+toString(subscriberID)+" not found.");
}
void Publisher::unsubscribeCallable(MessageID messageID, const py::object& callable)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
SubscriberInfoList::iterator it;
for (it = subscribers.begin(); it != subscribers.end(); it++) {
if ((*it)->isCallable(callable)) {
unsubscribeIterator(messageID, it);
return;
}
}
throwSubscriberNotFound(messageID, -1);
}
int Publisher::getNumSubscribers(MessageID messageID)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
return subscribers.size();
}
bool Publisher::isSubscribed(MessageID messageID, int subscriberID)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
SubscriberInfoList::iterator it;
for (it = subscribers.begin(); it != subscribers.end(); it++) {
if ((*it)->getID() == subscriberID) {
return true;
}
}
return false;
}
bool Publisher::isSubscribedCallable(MessageID messageID, const py::object& callable)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
SubscriberInfoList::iterator it;
for (it = subscribers.begin(); it != subscribers.end(); it++) {
if ((*it)->isCallable(callable)) {
return true;
}
}
return false;
}
void Publisher::publish(MessageID messageID)
{
if (m_SignalMap.find(messageID) != m_SignalMap.end()) {
throw Exception(AVG_ERR_INVALID_ARGS, "Signal with ID "+toString(messageID)+
"already registered.");
}
m_SignalMap[messageID] = SubscriberInfoList();
}
void Publisher::removeSubscribers()
{
SignalMap::iterator it;
for (it = m_SignalMap.begin(); it != m_SignalMap.end(); ++it) {
it->second = SubscriberInfoList();
}
}
void Publisher::notifySubscribers(MessageID messageID)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
if (!subscribers.empty()) {
py::list args;
notifySubscribersPy(messageID, args);
}
}
void Publisher::notifySubscribers(const string& sMsgName)
{
MessageID messageID = m_pPublisherDef->getMessageID(sMsgName);
notifySubscribers(messageID);
}
void Publisher::notifySubscribersPy(MessageID messageID, const py::list& args)
{
// cerr << this << " notifySubscribers " << messageID << endl;
// cerr << " ";
// dumpSubscribers(messageID);
AVG_ASSERT(!(Player::get()->isTraversingTree()));
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
WeakSubscriberInfoList subRefs;
for (SubscriberInfoList::iterator it = subscribers.begin(); it != subscribers.end();
++it)
{
subRefs.push_back(*it);
}
WeakSubscriberInfoList::iterator it;
for (it = subRefs.begin(); it != subRefs.end(); ++it) {
// cerr << " next" << endl;
if (!(*it).expired()) {
SubscriberInfoPtr pSub = (*it).lock();
if (pSub->hasExpired()) {
// Python subscriber doesn't exist anymore -> auto-unsubscribe.
unsubscribe(messageID, pSub->getID());
} else {
// cerr << " invoke: " << (*it)->getID() << endl;
pSub->invoke(args);
}
}
}
// cerr << " end notify" << endl;
}
MessageID Publisher::genMessageID()
{
return PublisherDefinitionRegistry::get()->genMessageID();
}
void Publisher::unsubscribeIterator(MessageID messageID, SubscriberInfoList::iterator it)
{
m_SignalMap[messageID].erase(it);
}
Publisher::SubscriberInfoList& Publisher::safeFindSubscribers(MessageID messageID)
{
if (m_SignalMap.find(messageID) == m_SignalMap.end()) {
throw Exception(AVG_ERR_INVALID_ARGS, "No signal with ID "+toString(messageID));
}
SubscriberInfoList& subscribers = m_SignalMap[messageID];
return subscribers;
}
void Publisher::throwSubscriberNotFound(MessageID messageID, int subscriberID)
{
if (subscriberID == -1) {
throw Exception(AVG_ERR_INVALID_ARGS, "Signal with ID "+toString(messageID)+
" doesn't have a subscriber with the given callable.");
} else {
throw Exception(AVG_ERR_INVALID_ARGS, "Signal with ID "+toString(messageID)+
" doesn't have a subscriber with ID "+toString(subscriberID));
}
}
void Publisher::dumpSubscribers(MessageID messageID)
{
SubscriberInfoList& subscribers = safeFindSubscribers(messageID);
SubscriberInfoList::iterator it;
for (it = subscribers.begin(); it != subscribers.end(); it++) {
cerr << (*it)->getID() << " ";
}
cerr << endl;
}
}
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