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// 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 "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "chrome/browser/printing/print_job_worker_owner.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Thread;
namespace printing {
// See definition below.
class JobEventDetails;
class PrintedDocument;
class PrintedPage;
class PrintedPagesSource;
class PrintJobWorker;
class PrinterQuery;
// Manages the print work for a specific document. Talks to the printer through
// PrintingContext through PrintJobWorker. Hides access to PrintingContext in a
// worker thread so the caller never blocks. PrintJob will send notifications on
// any state change. While printing, the PrintJobManager instance keeps a
// reference to the job to be sure it is kept alive. All the code in this class
// runs in the UI thread.
class PrintJob : public PrintJobWorkerOwner,
public content::NotificationObserver,
public base::MessageLoop::DestructionObserver {
// Create a empty PrintJob. When initializing with this constructor,
// post-constructor initialization must be done with Initialize().
// Grabs the ownership of the PrintJobWorker from another job, which is
// usually a PrinterQuery. Set the expected page count of the print job.
void Initialize(PrintJobWorkerOwner* job, PrintedPagesSource* source,
int page_count);
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// PrintJobWorkerOwner implementation.
virtual void GetSettingsDone(const PrintSettings& new_settings,
PrintingContext::Result result) OVERRIDE;
virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner) OVERRIDE;
virtual base::MessageLoop* message_loop() OVERRIDE;
virtual const PrintSettings& settings() const OVERRIDE;
virtual int cookie() const OVERRIDE;
// DestructionObserver implementation.
virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
// Starts the actual printing. Signals the worker that it should begin to
// spool as soon as data is available.
void StartPrinting();
// Asks for the worker thread to finish its queued tasks and disconnects the
// delegate object. The PrintJobManager will remove its reference. This may
// have the side-effect of destroying the object if the caller doesn't have a
// handle to the object. Use PrintJob::is_stopped() to check whether the
// worker thread has actually stopped.
void Stop();
// Cancels printing job and stops the worker thread. Takes effect immediately.
void Cancel();
// Synchronously wait for the job to finish. It is mainly useful when the
// process is about to be shut down and we're waiting for the spooler to eat
// our data.
bool FlushJob(base::TimeDelta timeout);
// Disconnects the PrintedPage source (PrintedPagesSource). It is done when
// the source is being destroyed.
void DisconnectSource();
// Returns true if the print job is pending, i.e. between a StartPrinting()
// and the end of the spooling.
bool is_job_pending() const;
// Access the current printed document. Warning: may be NULL.
PrintedDocument* document() const;
virtual ~PrintJob();
// Updates document_ to a new instance.
void UpdatePrintedDocument(PrintedDocument* new_document);
// Processes a NOTIFY_PRINT_JOB_EVENT notification.
void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
// Releases the worker thread by calling Stop(), then broadcasts a JOB_DONE
// notification.
void OnDocumentDone();
// Terminates the worker thread in a very controlled way, to work around any
// eventual deadlock.
void ControlledWorkerShutdown();
// Called at shutdown when running a nested message loop.
void Quit();
void HoldUntilStopIsCalled();
content::NotificationRegistrar registrar_;
// Main message loop reference. Used to send notifications in the right
// thread.
base::MessageLoop* const ui_message_loop_;
// Source that generates the PrintedPage's (i.e. a WebContents). It will be
// set back to NULL if the source is deleted before this object.
PrintedPagesSource* source_;
// All the UI is done in a worker thread because many Win32 print functions
// are blocking and enters a message loop without your consent. There is one
// worker thread per print job.
scoped_ptr<PrintJobWorker> worker_;
// Cache of the print context settings for access in the UI thread.
PrintSettings settings_;
// The printed document.
scoped_refptr<PrintedDocument> document_;
// Is the worker thread printing.
bool is_job_pending_;
// Is Canceling? If so, try to not cause recursion if on FAILED notification,
// the notified calls Cancel() again.
bool is_canceling_;
// Used at shutdown so that we can quit a nested message loop.
base::WeakPtrFactory<PrintJob> quit_factory_;
// Details for a NOTIFY_PRINT_JOB_EVENT notification. The members may be NULL.
class JobEventDetails : public base::RefCountedThreadSafe<JobEventDetails> {
// Event type.
enum Type {
// Print... dialog box has been closed with OK button.
// Print... dialog box has been closed with CANCEL button.
// An automated initialization has been done, e.g. Init(false, NULL).
// A new document started printing.
// A new page started printing.
// A page is done printing.
// A document is done printing. The worker thread is still alive. Warning:
// not a good moment to release the handle to PrintJob.
// The worker thread is finished. A good moment to release the handle to
// PrintJob.
// All missing pages have been requested.
// An error occured. Printing is canceled.
JobEventDetails(Type type, PrintedDocument* document, PrintedPage* page);
// Getters.
PrintedDocument* document() const;
PrintedPage* page() const;
Type type() const {
return type_;
friend class base::RefCountedThreadSafe<JobEventDetails>;
scoped_refptr<PrintedDocument> document_;
scoped_refptr<PrintedPage> page_;
const Type type_;
} // namespace printing