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e2e326a9c4
CLOSED TREE Backed out changeset c23b8418e6be (bug 1060987) Backed out changeset a8cddc6bdffc (bug 1061060) Backed out changeset b5af5cbdac3f (bug 1060982) Backed out changeset 4912d451011a (bug 1060930) Backed out changeset bdacbf453238 (bug 1061058) Backed out changeset da6c71a8f5ae (bug 1060987)
245 lines
9.5 KiB
C++
245 lines
9.5 KiB
C++
/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_FileSystemTaskBase_h
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#define mozilla_dom_FileSystemTaskBase_h
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/FileSystemRequestParent.h"
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#include "mozilla/dom/PFileSystemRequestChild.h"
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#include "mozilla/dom/ipc/Blob.h"
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class nsIDOMFile;
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namespace mozilla {
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namespace dom {
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class FileSystemBase;
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class FileSystemParams;
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class Promise;
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/*
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* The base class to implement a Task class.
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* The task is used to handle the OOP (out of process) operations.
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* The file system operations can only be performed in the parent process. When
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* performing such a parent-process-only operation, a task will delivered the
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* operation to the parent process if needed.
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*
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* The following diagram illustrates the how a API call from the content page
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* starts a task and gets call back results.
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*
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* The left block is the call sequence inside the child process, while the
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* right block is the call sequence inside the parent process.
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*
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* There are two types of API call. One is from the content page of the child
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* process and we mark the steps as (1) to (8). The other is from the content
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* page of the parent process and we mark the steps as (1') to (4').
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*
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* Page Page
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* | |
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* | (1) | (1')
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* ______|________________ | _____________________|_____________
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* | | | | | | |
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* | | Task in | | | Task in | |
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* | | Child Process | | | Parent Process | |
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* | V | IPC | V |
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* [new FileSystemTaskBase()] | | [new FileSystemTaskBase()] |
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* | | | | | | |
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* | | (2) | | | (2') |
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* | V | (3) | | |
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* | [GetRequestParams]------------->[new FileSystemTaskBase(...)] |
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* | | | | | |
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* | | | | | (4) | |
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* | | | | | V |
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* | | | | -----------> [Work] |
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* | | IPC | | |
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* | | | | (5) | (3') |
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* | | | | V |
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* | | | | --------[HandleResult] |
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* | | | | | | |
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* | | | | (6) | |
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* | | (7) | V | |
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* | [SetRequestResult]<-------------[GetRequestResult] | |
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* | | | | | (4') |
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* | | (8) | | | | |
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* | V | | | V |
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* |[HandlerCallback] | IPC | [HandlerCallback] |
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* |_______|_______________| | |_________________________|_________|
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* | | |
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* V V
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* Page Page
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*
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* 1. From child process page
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* Child:
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* (1) Call FileSystem API from content page with JS. Create a task and run.
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* The base constructor [FileSystemTaskBase()] of the task should be called.
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* (2) Forward the task to the parent process through the IPC and call
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* [GetRequestParams] to prepare the parameters of the IPC.
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* Parent:
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* (3) The parent process receives IPC and handle it in
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* FileystemRequestParent.
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* Get the IPC parameters and create a task to run the IPC task. The base
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* constructor [FileSystemTaskBase(aParam, aParent)] of the task should be
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* called to set the task as an IPC task.
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* (4) The task operation will be performed in the member function of [Work].
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* A worker thread will be created to run that function. If error occurs
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* during the operation, call [SetError] to record the error and then abort.
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* (5) After finishing the task operation, call [HandleResult] to send the
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* result back to the child process though the IPC.
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* (6) Call [GetRequestResult] request result to prepare the parameters of the
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* IPC. Because the formats of the error result for different task are the
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* same, FileSystemTaskBase can handle the error message without interfering.
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* Each task only needs to implement its specific success result preparation
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* function -[GetSuccessRequestResult].
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* Child:
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* (7) The child process receives IPC and calls [SetRequestResult] to get the
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* task result. Each task needs to implement its specific success result
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* parsing function [SetSuccessRequestResult] to get the success result.
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* (8) Call [HandlerCallback] to send the task result to the content page.
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* 2. From parent process page
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* We don't need to send the task parameters and result to other process. So
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* there are less steps, but their functions are the same. The correspondence
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* between the two types of steps is:
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* (1') = (1),
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* (2') = (4),
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* (3') = (5),
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* (4') = (8).
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*/
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class FileSystemTaskBase
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: public nsRunnable
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, public PFileSystemRequestChild
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{
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public:
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/*
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* Start the task. If the task is running the child process, it will be
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* forwarded to parent process by IPC, or else, creates a worker thread to
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* do the task work.
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*/
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void
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Start();
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/*
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* The error codes are defined in xpcom/base/ErrorList.h and their
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* corresponding error name and message are defined in dom/base/domerr.msg.
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*/
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void
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SetError(const nsresult& aErrorCode);
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FileSystemBase*
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GetFileSystem() const;
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/*
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* Get the type of permission access required to perform this task.
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*/
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virtual void
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GetPermissionAccessType(nsCString& aAccess) const = 0;
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NS_DECL_NSIRUNNABLE
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protected:
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/*
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* To create a task to handle the page content request.
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*/
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FileSystemTaskBase(FileSystemBase* aFileSystem);
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/*
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* To create a parent process task delivered from the child process through
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* IPC.
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*/
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FileSystemTaskBase(FileSystemBase* aFileSystem,
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const FileSystemParams& aParam,
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FileSystemRequestParent* aParent);
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virtual
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~FileSystemTaskBase();
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/*
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* The function to perform task operation. It will be run on the worker
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* thread of the parent process.
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* Overrides this function to define the task operation for individual task.
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*/
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virtual nsresult
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Work() = 0;
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/*
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* After the task is completed, this function will be called to pass the task
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* result to the content page.
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* Override this function to handle the call back to the content page.
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*/
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virtual void
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HandlerCallback() = 0;
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/*
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* Wrap the task parameter to FileSystemParams for sending it through IPC.
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* It will be called when we need to forward a task from the child process to
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* the prarent process.
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* @param filesystem The string representation of the file system.
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*/
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virtual FileSystemParams
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GetRequestParams(const nsString& aFileSystem) const = 0;
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/*
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* Wrap the task success result to FileSystemResponseValue for sending it
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* through IPC.
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* It will be called when the task is completed successfully and we need to
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* send the task success result back to the child process.
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*/
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virtual FileSystemResponseValue
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GetSuccessRequestResult() const = 0;
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/*
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* Unwrap the IPC message to get the task success result.
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* It will be called when the task is completed successfully and an IPC
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* message is received in the child process and we want to get the task
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* success result.
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*/
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virtual void
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SetSuccessRequestResult(const FileSystemResponseValue& aValue) = 0;
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bool
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HasError() const { return mErrorValue != NS_OK; }
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// Overrides PFileSystemRequestChild
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virtual bool
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Recv__delete__(const FileSystemResponseValue& value) MOZ_OVERRIDE;
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BlobParent*
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GetBlobParent(nsIDOMFile* aFile) const;
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nsresult mErrorValue;
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nsRefPtr<FileSystemBase> mFileSystem;
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nsRefPtr<FileSystemRequestParent> mRequestParent;
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private:
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/*
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* After finishing the task operation, handle the task result.
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* If it is an IPC task, send back the IPC result. Or else, send the result
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* to the content page.
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*/
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void
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HandleResult();
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/*
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* Wrap the task result to FileSystemResponseValue for sending it through IPC.
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* It will be called when the task is completed and we need to
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* send the task result back to the child process.
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*/
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FileSystemResponseValue
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GetRequestResult() const;
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/*
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* Unwrap the IPC message to get the task result.
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* It will be called when the task is completed and an IPC message is received
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* in the child process and we want to get the task result.
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*/
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void
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SetRequestResult(const FileSystemResponseValue& aValue);
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_FileSystemTaskBase_h
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