Add IPC stubs between browser and ServiceWorker's worker context in the child process

content/browser/service_worker/embedded_worker_instance.cc

 // Copyright 2013 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 "content/browser/service_worker/embedded_worker_instance.h"
 
 #include "content/browser/service_worker/embedded_worker_registry.h"
+#include "content/common/service_worker_messages.h"
 #include "url/gurl.h"
 
 namespace content {
 
 EmbeddedWorkerInstance::~EmbeddedWorkerInstance() {
-  registry_->RemoveWorker(embedded_worker_id_);
+  registry_->RemoveWorker(process_id_, embedded_worker_id_);
 }
 
 bool EmbeddedWorkerInstance::Start(
     int64 service_worker_version_id,
     const GURL& script_url) {
   DCHECK(status_ == STOPPED);
   if (!ChooseProcess())
     return false;
   status_ = STARTING;
   bool success = registry_->StartWorker(
       process_id_,
       embedded_worker_id_,
       service_worker_version_id,
       script_url);
   if (!success) {
     status_ = STOPPED;
     process_id_ = -1;
   }
   return success;
 }
 
 bool EmbeddedWorkerInstance::Stop() {
   DCHECK(status_ == STARTING || status_ == RUNNING);
   const bool success = registry_->StopWorker(process_id_, embedded_worker_id_);
   if (success)
     status_ = STOPPING;
   return success;
 }
 
+bool EmbeddedWorkerInstance::SendFetchRequest(
+    const ServiceWorkerFetchRequest& request) {
+  DCHECK(status_ == RUNNING);
+  // Note to reviewers: the code around FetchEvent is very rough, it's here
+  // basically to show how I'm planning to establish bidirectional channel
+  // between embedded worker and browser. (I can remove this part from this
+  // patch if this part looks too rough)

[alecflett, 2013/12/19 00:59:11]

I say leave it - this gives us something to build on - I'd keep the comment too,
turn it into a TODO

[kinuko, 2013/12/20 08:01:09]

Ok, changed it to a TODO comment

+  return registry_->Send(process_id_,
+                         new ServiceWorkerContextMsg_FetchEvent(
+                             thread_id_, embedded_worker_id_, request));
+}
+
 void EmbeddedWorkerInstance::AddProcessReference(int process_id) {
   ProcessRefMap::iterator found = process_refs_.find(process_id);
   if (found == process_refs_.end())
     found = process_refs_.insert(std::make_pair(process_id, 0)).first;
   ++found->second;
 }
 
 void EmbeddedWorkerInstance::ReleaseProcessReference(int process_id) {
   ProcessRefMap::iterator found = process_refs_.find(process_id);
   if (found == process_refs_.end()) {
     NOTREACHED() << "Releasing unknown process ref " << process_id;
     return;
   }
   if (--found->second == 0)
     process_refs_.erase(found);
 }
 
 EmbeddedWorkerInstance::EmbeddedWorkerInstance(
     EmbeddedWorkerRegistry* registry,
     int embedded_worker_id)
     : registry_(registry),
       embedded_worker_id_(embedded_worker_id),
       status_(STOPPED),
       process_id_(-1),
       thread_id_(-1) {
 }
 
 void EmbeddedWorkerInstance::OnStarted(int thread_id) {
+  // Stop is requested before OnStarted is sent back from the worker.
+  if (status_ == STOPPING)
+    return;
   DCHECK(status_ == STARTING);
   status_ = RUNNING;
   thread_id_ = thread_id;
 }
 
 void EmbeddedWorkerInstance::OnStopped() {
   status_ = STOPPED;
   process_id_ = -1;
   thread_id_ = -1;
 }
 
 bool EmbeddedWorkerInstance::ChooseProcess() {
   DCHECK_EQ(-1, process_id_);
   // Naive implementation; chooses a process which has the biggest number of
   // associated providers (so that hopefully likely live longer).
   ProcessRefMap::iterator max_ref_iter = process_refs_.end();
   for (ProcessRefMap::iterator iter = process_refs_.begin();
        iter != process_refs_.end(); ++iter) {
     if (max_ref_iter == process_refs_.end() ||
         max_ref_iter->second < iter->second)
       max_ref_iter = iter;
   }
   if (max_ref_iter == process_refs_.end())
     return false;
   process_id_ = max_ref_iter->first;
   return true;
 }
 
 }  // namespace content