void
Group::onSessionClose(const ProcessPtr &process, Session *session) {
TRACE_POINT();
// Standard resource management boilerplate stuff...
PoolPtr pool = getPool();
boost::unique_lock<boost::mutex> lock(pool->syncher);
assert(process->isAlive());
assert(isAlive() || getLifeStatus() == SHUTTING_DOWN);
P_TRACE(2, "Session closed for process " << process->inspect());
verifyInvariants();
UPDATE_TRACE_POINT();
/* Update statistics. */
process->sessionClosed(session);
assert(process->getLifeStatus() == Process::ALIVE);
assert(process->enabled == Process::ENABLED
|| process->enabled == Process::DISABLING
|| process->enabled == Process::DETACHED);
if (process->enabled == Process::ENABLED) {
pqueue.decrease(process->pqHandle, process->busyness());
}
/* This group now has a process that's guaranteed to be not
* totally busy.
*/
assert(!process->isTotallyBusy());
bool detachingBecauseOfMaxRequests = false;
bool detachingBecauseCapacityNeeded = false;
bool shouldDetach =
( detachingBecauseOfMaxRequests = (
options.maxRequests > 0
&& process->processed >= options.maxRequests
)) || (
detachingBecauseCapacityNeeded = (
process->sessions == 0
&& getWaitlist.empty()
&& (
!pool->getWaitlist.empty()
|| anotherGroupIsWaitingForCapacity()
)
)
);
bool shouldDisable =
process->enabled == Process::DISABLING
&& process->sessions == 0
&& enabledCount > 0;
if (shouldDetach || shouldDisable) {
vector<Callback> actions;
if (shouldDetach) {
if (detachingBecauseCapacityNeeded) {
/* Someone might be trying to get() a session for a different
* group that couldn't be spawned because of lack of pool capacity.
* If this group isn't under sufficiently load (as apparent by the
* checked conditions) then now's a good time to detach
* this process or group in order to free capacity.
*/
P_DEBUG("Process " << process->inspect() << " is no longer totally "
"busy; detaching it in order to make room in the pool");
} else {
/* This process has processed its maximum number of requests,
* so we detach it.
*/
P_DEBUG("Process " << process->inspect() <<
" has reached its maximum number of requests (" <<
options.maxRequests << "); detaching it");
}
pool->detachProcessUnlocked(process, actions);
} else {
removeProcessFromList(process, disablingProcesses);
addProcessToList(process, disabledProcesses);
removeFromDisableWaitlist(process, DR_SUCCESS, actions);
maybeInitiateOobw(process);
}
pool->fullVerifyInvariants();
lock.unlock();
runAllActions(actions);
} else {
// This could change process->enabled.
maybeInitiateOobw(process);
if (!getWaitlist.empty() && process->enabled == Process::ENABLED) {
/* If there are clients on this group waiting for a process to
* become available then call them now.
*/
UPDATE_TRACE_POINT();
// Already calls verifyInvariants().
assignSessionsToGetWaitersQuickly(lock);
}
}
}
void
Group::detachedProcessesCheckerMain(GroupPtr self) {
TRACE_POINT();
PoolPtr pool = getPool();
Pool::DebugSupportPtr debug = pool->debugSupport;
if (debug != NULL && debug->detachedProcessesChecker) {
debug->debugger->send("About to start detached processes checker");
debug->messages->recv("Proceed with starting detached processes checker");
}
boost::unique_lock<boost::mutex> lock(pool->syncher);
while (true) {
assert(detachedProcessesCheckerActive);
if (getLifeStatus() == SHUT_DOWN || this_thread::interruption_requested()) {
UPDATE_TRACE_POINT();
P_DEBUG("Stopping detached processes checker");
detachedProcessesCheckerActive = false;
break;
}
UPDATE_TRACE_POINT();
if (!detachedProcesses.empty()) {
P_TRACE(2, "Checking whether any of the " << detachedProcesses.size() <<
" detached processes have exited...");
ProcessList::iterator it = detachedProcesses.begin();
ProcessList::iterator end = detachedProcesses.end();
while (it != end) {
const ProcessPtr process = *it;
switch (process->getLifeStatus()) {
case Process::ALIVE:
if (process->canTriggerShutdown()) {
P_DEBUG("Detached process " << process->inspect() <<
" has 0 active sessions now. Triggering shutdown.");
process->triggerShutdown();
assert(process->getLifeStatus() == Process::SHUTDOWN_TRIGGERED);
}
it++;
break;
case Process::SHUTDOWN_TRIGGERED:
if (process->canCleanup()) {
P_DEBUG("Detached process " << process->inspect() << " has shut down. Cleaning up associated resources.");
process->cleanup();
assert(process->getLifeStatus() == Process::DEAD);
it++;
removeProcessFromList(process, detachedProcesses);
} else if (process->shutdownTimeoutExpired()) {
P_WARN("Detached process " << process->inspect() <<
" didn't shut down within " PROCESS_SHUTDOWN_TIMEOUT_DISPLAY
". Forcefully killing it with SIGKILL.");
kill(process->pid, SIGKILL);
it++;
} else {
it++;
}
break;
default:
P_BUG("Unknown 'lifeStatus' state " << (int) process->getLifeStatus());
}
}
}
UPDATE_TRACE_POINT();
if (detachedProcesses.empty()) {
UPDATE_TRACE_POINT();
P_DEBUG("Stopping detached processes checker");
detachedProcessesCheckerActive = false;
vector<Callback> actions;
if (shutdownCanFinish()) {
UPDATE_TRACE_POINT();
finishShutdown(actions);
}
verifyInvariants();
verifyExpensiveInvariants();
lock.unlock();
UPDATE_TRACE_POINT();
runAllActions(actions);
break;
} else {
UPDATE_TRACE_POINT();
verifyInvariants();
verifyExpensiveInvariants();
}
// Not all processes can be shut down yet. Sleep for a while unless
// someone wakes us up.
UPDATE_TRACE_POINT();
detachedProcessesCheckerCond.timed_wait(lock,
posix_time::milliseconds(100));
}
}
void
SuperGroup::realDoInitialize(const Options &options, unsigned int generation) {
vector<ComponentInfo> componentInfos;
vector<ComponentInfo>::const_iterator it;
ExceptionPtr exception;
P_TRACE(2, "Initializing SuperGroup " << inspect() << " in the background...");
try {
componentInfos = loadComponentInfos(options);
} catch (const tracable_exception &e) {
exception = copyException(e);
}
if (componentInfos.empty() && exception == NULL) {
string message = "The directory " +
options.appRoot +
" does not seem to contain a web application.";
exception = boost::make_shared<SpawnException>(
message, message, false);
}
PoolPtr pool = getPool();
Pool::DebugSupportPtr debug = pool->debugSupport;
vector<Callback> actions;
{
if (debug != NULL && debug->superGroup) {
debug->debugger->send("About to finish SuperGroup initialization");
debug->messages->recv("Proceed with initializing SuperGroup");
}
boost::unique_lock<boost::mutex> lock(getPoolSyncher(pool));
this_thread::disable_interruption di;
this_thread::disable_syscall_interruption dsi;
NOT_EXPECTING_EXCEPTIONS();
if (OXT_UNLIKELY(getPool() == NULL || generation != this->generation)) {
return;
}
P_TRACE(2, "Initialization of SuperGroup " << inspect() << " almost done; grabbed lock");
assert(state == INITIALIZING);
verifyInvariants();
if (componentInfos.empty()) {
/* Somehow initialization failed. Maybe something has deleted
* the supergroup files while we're working.
*/
assert(exception != NULL);
setState(DESTROYED);
actions.reserve(getWaitlist.size());
while (!getWaitlist.empty()) {
const GetWaiter &waiter = getWaitlist.front();
actions.push_back(boost::bind(waiter.callback,
SessionPtr(), exception));
getWaitlist.pop_front();
}
} else {
for (it = componentInfos.begin(); it != componentInfos.end(); it++) {
const ComponentInfo &info = *it;
GroupPtr group = boost::make_shared<Group>(shared_from_this(),
options, info);
groups.push_back(group);
if (info.isDefault) {
defaultGroup = group.get();
}
}
setState(READY);
assignGetWaitlistToGroups(actions);
}
verifyInvariants();
P_TRACE(2, "Done initializing SuperGroup " << inspect());
}
this_thread::disable_interruption di;
this_thread::disable_syscall_interruption dsi;
runAllActions(actions);
runInitializationHooks();
}
int infix2postfix(const std::string &query, std::vector<std::string> &result)
{
char buffer[4096];
result.clear();
char ch;
int len = 0;
for (size_t i = 0; i < query.length(); ++i)
{
ch = query.at(i);
if (::isspace(ch) == 0)
{
if (!is_valid_trigger_char(ch))
{
P_WARNING("invalid char[%c] in query[%s]", ch, query.c_str());
return -1;
}
buffer[len++] = ch;
if (len >= int(sizeof(buffer)))
{
P_WARNING("too long query[%s]", query.c_str());
return -1;
}
}
}
buffer[len] = '\0';
P_TRACE("clean query[%s]", buffer);
int start = -1;
int last_token = 0;
std::stack<char> op_stack;
for (int i = 0; i < len; )
{
ch = buffer[i];
if (ch >= '0' && ch <= '9')
{
start = i++;
while (i < len)
{
ch = buffer[i];
if (ch >= '0' && ch <= '9')
{
++i;
}
else break;
}
result.push_back(std::string(buffer + start, i - start));
P_TRACE("get token[%s]", result[result.size() - 1].c_str());
last_token = 1;
}
else if (ch == '(')
{
if (last_token == 1)
{
P_WARNING("invalid operator '('");
return -1;
}
op_stack.push(ch);
P_TRACE("meet operator '('");
last_token = 0;
++i;
}
else if (ch == ')')
{
if (last_token != 1)
{
P_WARNING("invalid operator ')', has nothing in ()");
return -1;
}
P_TRACE("meet operator ')'");
bool matched = false;
while (op_stack.size() > 0)
{
char op = op_stack.top();
op_stack.pop();
if (op == '(')
{
matched = true;
break;
}
result.push_back(std::string(&op, 1));
P_TRACE("push back operator[%c]", op);
}
if (!matched)
{
P_WARNING("unmatched operator ')'");
return -1;
}
last_token = 1;
++i;
}
else
{
if (last_token != 1)
{
P_WARNING("operator '%c' must has left value", ch);
return -1;
}
P_TRACE("meet operator[%c]", ch);
while (op_stack.size() > 0)
{
char op = op_stack.top();
if (op == '(')
{
break;
}
if (g_operator_priority[uint8_t(op)] > g_operator_priority[uint8_t(ch)])
{
break;
}
op_stack.pop();
result.push_back(std::string(&op, 1));
P_TRACE("push back operator[%c]", op);
}
op_stack.push(ch);
last_token = 2;
++i;
}
}
while (op_stack.size() > 0)
{
char op = op_stack.top();
if (op == '(')
{
P_WARNING("unmatched operator '('");
return -1;
}
op_stack.pop();
result.push_back(std::string(&op, 1));
P_TRACE("push back operator[%c]", op);
}
P_TRACE("parsed query[%s] ok", query.c_str());
for (size_t i = 0; i < result.size(); ++i)
{
P_TRACE("parsed tokens[%03d]: %s", int(i), result[i].c_str());
}
return 0;
}
