[Android] Move content/browser/{renderer_host => android}/java/*

content/browser/renderer_host/java/java_bridge_dispatcher_host.cc

-// 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