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//===-- Broadcaster.cpp -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/Broadcaster.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/Log.h"
#include "lldb/Core/Event.h"
#include "lldb/Core/StreamString.h"
#include "lldb/lldb-private-log.h"
using namespace lldb;
using namespace lldb_private;
Broadcaster::Broadcaster (const char *name) :
m_broadcaster_name (name),
m_broadcaster_listeners (),
m_broadcaster_listeners_mutex (Mutex::eMutexTypeRecursive)
{
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT);
if (log)
log->Printf ("%p Broadcaster::Broadcaster(\"%s\")", this, m_broadcaster_name.AsCString());
}
Broadcaster::~Broadcaster()
{
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT);
if (log)
log->Printf ("%p Broadcaster::~Broadcaster(\"%s\")", this, m_broadcaster_name.AsCString());
// Scope for "listeners_locker"
{
Mutex::Locker listeners_locker(m_broadcaster_listeners_mutex);
// Make sure the listener forgets about this broadcaster. We do
// this in the broadcaster in case the broadcaster object initiates
// the removal.
collection::iterator pos, end = m_broadcaster_listeners.end();
for (pos = m_broadcaster_listeners.begin(); pos != end; ++pos)
pos->first->BroadcasterWillDestruct (this);
m_broadcaster_listeners.clear();
}
}
const ConstString &
Broadcaster::GetBroadcasterName ()
{
return m_broadcaster_name;
}
void
Broadcaster::AddInitialEventsToListener (Listener *listener, uint32_t requested_events)
{
}
uint32_t
Broadcaster::AddListener (Listener* listener, uint32_t event_mask)
{
Mutex::Locker locker(m_broadcaster_listeners_mutex);
collection::iterator pos, end = m_broadcaster_listeners.end();
collection::iterator existing_pos = end;
// See if we already have this listener, and if so, update its mask
uint32_t taken_event_types = 0;
for (pos = m_broadcaster_listeners.begin(); pos != end; ++pos)
{
if (pos->first == listener)
existing_pos = pos;
// For now don't descriminate on who gets what
// FIXME: Implement "unique listener for this bit" mask
// taken_event_types |= pos->second;
}
// Each event bit in a Broadcaster object can only be used
// by one listener
uint32_t available_event_types = ~taken_event_types & event_mask;
if (available_event_types)
{
// If we didn't find our listener, add it
if (existing_pos == end)
{
// Grant a new listener the available event bits
m_broadcaster_listeners.push_back(std::make_pair(listener, available_event_types));
}
else
{
// Grant the existing listener the available event bits
existing_pos->second |= available_event_types;
}
// Individual broadcasters decide whether they have outstanding data when a
// listener attaches, and insert it into the listener with this method.
AddInitialEventsToListener (listener, available_event_types);
}
// Return the event bits that were granted to the listener
return available_event_types;
}
bool
Broadcaster::EventTypeHasListeners (uint32_t event_type)
{
Mutex::Locker locker (m_broadcaster_listeners_mutex);
if (m_broadcaster_listeners.empty())
return false;
collection::iterator pos, end = m_broadcaster_listeners.end();
for (pos = m_broadcaster_listeners.begin(); pos != end; ++pos)
{
if (pos->second & event_type)
return true;
}
return false;
}
bool
Broadcaster::RemoveListener (Listener* listener, uint32_t event_mask)
{
Mutex::Locker locker(m_broadcaster_listeners_mutex);
collection::iterator pos, end = m_broadcaster_listeners.end();
// See if we already have this listener, and if so, update its mask
for (pos = m_broadcaster_listeners.begin(); pos != end; ++pos)
{
if (pos->first == listener)
{
// Relinquish all event bits in "event_mask"
pos->second &= ~event_mask;
// If all bits have been relinquished then remove this listener
if (pos->second == 0)
m_broadcaster_listeners.erase (pos);
return true;
}
}
return false;
}
void
Broadcaster::BroadcastEvent (EventSP &event_sp)
{
return PrivateBroadcastEvent (event_sp, false);
}
void
Broadcaster::BroadcastEventIfUnique (EventSP &event_sp)
{
return PrivateBroadcastEvent (event_sp, true);
}
void
Broadcaster::PrivateBroadcastEvent (EventSP &event_sp, bool unique)
{
// Can't add a NULL event...
if (event_sp.get() == NULL)
return;
// Update the broadcaster on this event
event_sp->SetBroadcaster (this);
const uint32_t event_type = event_sp->GetType();
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EVENTS);
if (log)
{
StreamString event_description;
event_sp->Dump (&event_description);
log->Printf ("%p Broadcaster(\"%s\")::BroadcastEvent (event_sp = {%s}, unique =%i)",
this,
m_broadcaster_name.AsCString(""),
event_description.GetData(),
unique);
}
Mutex::Locker event_types_locker(m_broadcaster_listeners_mutex);
collection::iterator pos, end = m_broadcaster_listeners.end();
// Iterate through all listener/mask pairs
for (pos = m_broadcaster_listeners.begin(); pos != end; ++pos)
{
// If the listener's mask matches any bits that we just set, then
// put the new event on its event queue.
if (event_type & pos->second)
{
if (unique && pos->first->PeekAtNextEventForBroadcasterWithType (this, event_type))
continue;
pos->first->AddEvent (event_sp);
}
}
}
void
Broadcaster::BroadcastEvent (uint32_t event_type, EventData *event_data)
{
EventSP event_sp (new Event (event_type, event_data));
PrivateBroadcastEvent (event_sp, false);
}
void
Broadcaster::BroadcastEventIfUnique (uint32_t event_type, EventData *event_data)
{
EventSP event_sp (new Event (event_type, event_data));
PrivateBroadcastEvent (event_sp, true);
}
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