// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "dbus/dbus_statistics.h"
#include <set>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
namespace dbus {
namespace {
// Used to store dbus statistics sorted alphabetically by service, interface,
// then method (using std::string <).
struct Stat {
Stat(const std::string& service,
const std::string& interface,
const std::string& method)
: service(service),
interface(interface),
method(method),
sent_method_calls(0),
received_signals(0),
sent_blocking_method_calls(0) {
}
std::string service;
std::string interface;
std::string method;
int sent_method_calls;
int received_signals;
int sent_blocking_method_calls;
bool Compare(const Stat& other) const {
if (service != other.service)
return service < other.service;
if (interface != other.interface)
return interface < other.interface;
return method < other.method;
}
struct PtrCompare {
bool operator()(Stat* lhs, Stat* rhs) const {
DCHECK(lhs && rhs);
return lhs->Compare(*rhs);
}
};
};
typedef std::set<Stat*, Stat::PtrCompare> StatSet;
//------------------------------------------------------------------------------
// DBusStatistics
// Simple class for gathering DBus usage statistics.
class DBusStatistics {
public:
DBusStatistics()
: start_time_(base::Time::Now()),
origin_thread_id_(base::PlatformThread::CurrentId()) {
}
~DBusStatistics() {
DCHECK_EQ(origin_thread_id_, base::PlatformThread::CurrentId());
STLDeleteContainerPointers(stats_.begin(), stats_.end());
}
// Enum to specify which field in Stat to increment in AddStat
enum StatType {
TYPE_SENT_METHOD_CALLS,
TYPE_RECEIVED_SIGNALS,
TYPE_SENT_BLOCKING_METHOD_CALLS
};
// Add a call to |method| for |interface|. See also MethodCall in message.h.
void AddStat(const std::string& service,
const std::string& interface,
const std::string& method,
StatType type) {
if (base::PlatformThread::CurrentId() != origin_thread_id_) {
DVLOG(1) << "Ignoring DBusStatistics::AddStat call from thread: "
<< base::PlatformThread::CurrentId();
return;
}
Stat* stat = GetStat(service, interface, method, true);
DCHECK(stat);
if (type == TYPE_SENT_METHOD_CALLS)
++stat->sent_method_calls;
else if (type == TYPE_RECEIVED_SIGNALS)
++stat->received_signals;
else if (type == TYPE_SENT_BLOCKING_METHOD_CALLS)
++stat->sent_blocking_method_calls;
else
NOTREACHED();
}
// Look up the Stat entry in |stats_|. If |add_stat| is true, add a new entry
// if one does not already exist.
Stat* GetStat(const std::string& service,
const std::string& interface,
const std::string& method,
bool add_stat) {
DCHECK_EQ(origin_thread_id_, base::PlatformThread::CurrentId());
scoped_ptr<Stat> stat(new Stat(service, interface, method));
StatSet::iterator found = stats_.find(stat.get());
if (found != stats_.end())
return *found;
if (!add_stat)
return NULL;
found = stats_.insert(stat.release()).first;
return *found;
}
StatSet& stats() { return stats_; }
base::Time start_time() { return start_time_; }
private:
StatSet stats_;
base::Time start_time_;
base::PlatformThreadId origin_thread_id_;
DISALLOW_COPY_AND_ASSIGN(DBusStatistics);
};
DBusStatistics* g_dbus_statistics = NULL;
} // namespace
//------------------------------------------------------------------------------
namespace statistics {
void Initialize() {
if (g_dbus_statistics)
delete g_dbus_statistics; // reset statistics
g_dbus_statistics = new DBusStatistics();
}
void Shutdown() {
delete g_dbus_statistics;
g_dbus_statistics = NULL;
}
void AddSentMethodCall(const std::string& service,
const std::string& interface,
const std::string& method) {
if (!g_dbus_statistics)
return;
g_dbus_statistics->AddStat(
service, interface, method, DBusStatistics::TYPE_SENT_METHOD_CALLS);
}
void AddReceivedSignal(const std::string& service,
const std::string& interface,
const std::string& method) {
if (!g_dbus_statistics)
return;
g_dbus_statistics->AddStat(
service, interface, method, DBusStatistics::TYPE_RECEIVED_SIGNALS);
}
void AddBlockingSentMethodCall(const std::string& service,
const std::string& interface,
const std::string& method) {
if (!g_dbus_statistics)
return;
g_dbus_statistics->AddStat(
service, interface, method,
DBusStatistics::TYPE_SENT_BLOCKING_METHOD_CALLS);
}
// NOTE: If the output format is changed, be certain to change the test
// expectations as well.
std::string GetAsString(ShowInString show, FormatString format) {
if (!g_dbus_statistics)
return "DBusStatistics not initialized.";
const StatSet& stats = g_dbus_statistics->stats();
if (stats.empty())
return "No DBus calls.";
base::TimeDelta dtime = base::Time::Now() - g_dbus_statistics->start_time();
int dminutes = dtime.InMinutes();
dminutes = std::max(dminutes, 1);
std::string result;
int sent = 0, received = 0, sent_blocking = 0;
// Stats are stored in order by service, then interface, then method.
for (StatSet::const_iterator iter = stats.begin(); iter != stats.end(); ) {
StatSet::const_iterator cur_iter = iter;
StatSet::const_iterator next_iter = ++iter;
const Stat* stat = *cur_iter;
sent += stat->sent_method_calls;
received += stat->received_signals;
sent_blocking += stat->sent_blocking_method_calls;
// If this is not the last stat, and if the next stat matches the current
// stat, continue.
if (next_iter != stats.end() &&
(*next_iter)->service == stat->service &&
(show < SHOW_INTERFACE || (*next_iter)->interface == stat->interface) &&
(show < SHOW_METHOD || (*next_iter)->method == stat->method))
continue;
if (!sent && !received && !sent_blocking)
continue; // No stats collected for this line, skip it and continue.
// Add a line to the result and clear the counts.
std::string line;
if (show == SHOW_SERVICE) {
line += stat->service;
} else {
// The interface usually includes the service so don't show both.
line += stat->interface;
if (show >= SHOW_METHOD)
line += "." + stat->method;
}
line += base::StringPrintf(":");
if (sent_blocking) {
line += base::StringPrintf(" Sent (BLOCKING):");
if (format == FORMAT_TOTALS)
line += base::StringPrintf(" %d", sent_blocking);
else if (format == FORMAT_PER_MINUTE)
line += base::StringPrintf(" %d/min", sent_blocking / dminutes);
else if (format == FORMAT_ALL)
line += base::StringPrintf(" %d (%d/min)",
sent_blocking, sent_blocking / dminutes);
}
if (sent) {
line += base::StringPrintf(" Sent:");
if (format == FORMAT_TOTALS)
line += base::StringPrintf(" %d", sent);
else if (format == FORMAT_PER_MINUTE)
line += base::StringPrintf(" %d/min", sent / dminutes);
else if (format == FORMAT_ALL)
line += base::StringPrintf(" %d (%d/min)", sent, sent / dminutes);
}
if (received) {
line += base::StringPrintf(" Received:");
if (format == FORMAT_TOTALS)
line += base::StringPrintf(" %d", received);
else if (format == FORMAT_PER_MINUTE)
line += base::StringPrintf(" %d/min", received / dminutes);
else if (format == FORMAT_ALL)
line += base::StringPrintf(
" %d (%d/min)", received, received / dminutes);
}
result += line + "\n";
sent = 0;
sent_blocking = 0;
received = 0;
}
return result;
}
namespace testing {
bool GetCalls(const std::string& service,
const std::string& interface,
const std::string& method,
int* sent,
int* received,
int* blocking) {
if (!g_dbus_statistics)
return false;
Stat* stat = g_dbus_statistics->GetStat(service, interface, method, false);
if (!stat)
return false;
*sent = stat->sent_method_calls;
*received = stat->received_signals;
*blocking = stat->sent_blocking_method_calls;
return true;
}
} // namespace testing
} // namespace statistics
} // namespace dbus