| // 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 "content/browser/renderer_host/java/java_bridge_dispatcher_host.h" |
| |
| #include "base/android/java_handler_thread.h" |
| #include "base/bind.h" |
| #include "base/lazy_instance.h" |
| #include "content/browser/renderer_host/java/java_bridge_channel_host.h" |
| #include "content/child/child_process.h" |
| #include "content/child/npapi/npobject_stub.h" |
| #include "content/child/npapi/npobject_util.h" // For CreateNPVariantParam() |
| #include "content/common/java_bridge_messages.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "content/public/browser/render_frame_host.h" |
| #include "content/public/browser/render_process_host.h" |
| #include "third_party/WebKit/public/web/WebBindings.h" |
| |
| #if !defined(OS_ANDROID) |
| #error "JavaBridge only supports OS_ANDROID" |
| #endif |
| |
| namespace content { |
| |
| namespace { |
| // The JavaBridge needs to use a Java thread so the callback |
| // will happen on a thread with a prepared Looper. |
| class JavaBridgeThread : public base::android::JavaHandlerThread { |
| public: |
| JavaBridgeThread() : base::android::JavaHandlerThread("JavaBridge") { |
| Start(); |
| } |
| virtual ~JavaBridgeThread() { |
| Stop(); |
| } |
| }; |
| |
| void CleanUpStubs(const std::vector<base::WeakPtr<NPObjectStub> > & stubs) { |
| for (size_t i = 0; i < stubs.size(); ++i) { |
| if (stubs[i]) { |
| stubs[i]->DeleteSoon(); |
| } |
| } |
| } |
| |
| base::LazyInstance<JavaBridgeThread> g_background_thread = |
| LAZY_INSTANCE_INITIALIZER; |
| } // namespace |
| |
| JavaBridgeDispatcherHost::JavaBridgeDispatcherHost( |
| RenderFrameHost* render_frame_host) |
| : render_frame_host_(render_frame_host) { |
| } |
| |
| JavaBridgeDispatcherHost::~JavaBridgeDispatcherHost() { |
| g_background_thread.Get().message_loop()->PostTask( |
| FROM_HERE, |
| base::Bind(&CleanUpStubs, stubs_)); |
| } |
| |
| void JavaBridgeDispatcherHost::AddNamedObject(const base::string16& name, |
| NPObject* object) { |
| NPVariant_Param variant_param; |
| CreateNPVariantParam(object, &variant_param); |
| |
| Send(new JavaBridgeMsg_AddNamedObject( |
| render_frame_host_->GetRoutingID(), name, variant_param)); |
| } |
| |
| void JavaBridgeDispatcherHost::RemoveNamedObject(const base::string16& name) { |
| // On receipt of this message, the JavaBridgeDispatcher will drop its |
| // reference to the corresponding proxy object. When the last reference is |
| // removed, the proxy object will delete its NPObjectProxy, which will cause |
| // the NPObjectStub to be deleted, which will drop its reference to the |
| // original NPObject. |
| Send(new JavaBridgeMsg_RemoveNamedObject( |
| render_frame_host_->GetRoutingID(), name)); |
| } |
| |
| void JavaBridgeDispatcherHost::RenderFrameDeleted() { |
| render_frame_host_ = NULL; |
| } |
| |
| void JavaBridgeDispatcherHost::OnGetChannelHandle(IPC::Message* reply_msg) { |
| g_background_thread.Get().message_loop()->PostTask( |
| FROM_HERE, |
| base::Bind(&JavaBridgeDispatcherHost::GetChannelHandle, this, reply_msg)); |
| } |
| |
| void JavaBridgeDispatcherHost::Send(IPC::Message* msg) { |
| if (render_frame_host_) { |
| render_frame_host_->Send(msg); |
| return; |
| } |
| |
| delete msg; |
| } |
| |
| void JavaBridgeDispatcherHost::GetChannelHandle(IPC::Message* reply_msg) { |
| // The channel creates the channel handle based on the renderer ID we passed |
| // to GetJavaBridgeChannelHost() and, on POSIX, the file descriptor used by |
| // the underlying channel. |
| JavaBridgeHostMsg_GetChannelHandle::WriteReplyParams( |
| reply_msg, |
| channel_->channel_handle()); |
| |
| BrowserThread::PostTask( |
| BrowserThread::UI, |
| FROM_HERE, |
| base::Bind(&JavaBridgeDispatcherHost::Send, this, reply_msg)); |
| } |
| |
| void JavaBridgeDispatcherHost::CreateNPVariantParam(NPObject* object, |
| NPVariant_Param* param) { |
| // The JavaBridgeChannelHost needs to be created on the background thread, as |
| // that is where Java objects will live, and CreateNPVariantParam() needs the |
| // channel to create the NPObjectStub. To avoid blocking here until the |
| // channel is ready, create the NPVariant_Param by hand, then post a message |
| // to the background thread to set up the channel and create the corresponding |
| // NPObjectStub. Post that message before doing any IPC, to make sure that |
| // the channel and object proxies are ready before responses are received |
| // from the renderer. |
| |
| // Create an NPVariantParam suitable for serialization over IPC from our |
| // NPVariant. See CreateNPVariantParam() in npobject_utils. |
| param->type = NPVARIANT_PARAM_SENDER_OBJECT_ROUTING_ID; |
| int route_id = JavaBridgeChannelHost::ThreadsafeGenerateRouteID(); |
| param->npobject_routing_id = route_id; |
| |
| blink::WebBindings::retainObject(object); |
| g_background_thread.Get().message_loop()->PostTask( |
| FROM_HERE, |
| base::Bind(&JavaBridgeDispatcherHost::CreateObjectStub, this, object, |
| render_frame_host_->GetProcess()->GetID(), route_id)); |
| } |
| |
| void JavaBridgeDispatcherHost::CreateObjectStub(NPObject* object, |
| int render_process_id, |
| int route_id) { |
| DCHECK_EQ(g_background_thread.Get().message_loop(), |
| base::MessageLoop::current()); |
| if (!channel_.get()) { |
| channel_ = JavaBridgeChannelHost::GetJavaBridgeChannelHost( |
| render_process_id, |
| BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)); |
| } |
| |
| // In a typical scenario, the lifetime of each NPObjectStub is governed by |
| // that of the NPObjectProxy in the renderer, via the channel. However, |
| // we cannot guaranteed that the renderer always terminates cleanly |
| // (crashes / sometimes just unavoidable). We keep a weak reference to |
| // it now and schedule a delete on it when this host is getting deleted. |
| |
| // Pass 0 for the containing window, as it's only used by plugins to pump the |
| // window message queue when a method on a renderer-side object causes a |
| // dialog to be displayed, and the Java Bridge does not need this |
| // functionality. The page URL is also not required. |
| stubs_.push_back((new NPObjectStub( |
| object, channel_.get(), route_id, 0, GURL()))->AsWeakPtr()); |
| |
| // The NPObjectStub takes a reference to the NPObject. Release the ref added |
| // in CreateNPVariantParam(). |
| blink::WebBindings::releaseObject(object); |
| } |
| |
| } // namespace content |