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// Copyright 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.
#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_IO_IOS_H_
#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_IO_IOS_H_
#include "base/base_export.h"
#include "base/mac/scoped_cffiledescriptorref.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_pump_mac.h"
#include "base/observer_list.h"
#include "base/threading/thread_checker.h"
namespace base {
// This file introduces a class to monitor sockets and issue callbacks when
// sockets are ready for I/O on iOS.
class BASE_EXPORT MessagePumpIOSForIO : public MessagePumpNSRunLoop {
public:
class IOObserver {
public:
IOObserver() {}
// An IOObserver is an object that receives IO notifications from the
// MessagePump.
//
// NOTE: An IOObserver implementation should be extremely fast!
virtual void WillProcessIOEvent() = 0;
virtual void DidProcessIOEvent() = 0;
protected:
virtual ~IOObserver() {}
};
// Used with WatchFileDescriptor to asynchronously monitor the I/O readiness
// of a file descriptor.
class Watcher {
public:
// Called from MessageLoop::Run when an FD can be read from/written to
// without blocking
virtual void OnFileCanReadWithoutBlocking(int fd) = 0;
virtual void OnFileCanWriteWithoutBlocking(int fd) = 0;
protected:
virtual ~Watcher() {}
};
// Object returned by WatchFileDescriptor to manage further watching.
class FileDescriptorWatcher {
public:
FileDescriptorWatcher();
~FileDescriptorWatcher(); // Implicitly calls StopWatchingFileDescriptor.
// NOTE: These methods aren't called StartWatching()/StopWatching() to
// avoid confusion with the win32 ObjectWatcher class.
// Stop watching the FD, always safe to call. No-op if there's nothing
// to do.
bool StopWatchingFileDescriptor();
private:
friend class MessagePumpIOSForIO;
friend class MessagePumpIOSForIOTest;
// Called by MessagePumpIOSForIO, ownership of |fdref| and |fd_source|
// is transferred to this object.
void Init(CFFileDescriptorRef fdref,
CFOptionFlags callback_types,
CFRunLoopSourceRef fd_source,
bool is_persistent);
void set_pump(base::WeakPtr<MessagePumpIOSForIO> pump) { pump_ = pump; }
const base::WeakPtr<MessagePumpIOSForIO>& pump() const { return pump_; }
void set_watcher(Watcher* watcher) { watcher_ = watcher; }
void OnFileCanReadWithoutBlocking(int fd, MessagePumpIOSForIO* pump);
void OnFileCanWriteWithoutBlocking(int fd, MessagePumpIOSForIO* pump);
bool is_persistent_; // false if this event is one-shot.
base::mac::ScopedCFFileDescriptorRef fdref_;
CFOptionFlags callback_types_;
base::ScopedCFTypeRef<CFRunLoopSourceRef> fd_source_;
base::WeakPtr<MessagePumpIOSForIO> pump_;
Watcher* watcher_;
DISALLOW_COPY_AND_ASSIGN(FileDescriptorWatcher);
};
enum Mode {
WATCH_READ = 1 << 0,
WATCH_WRITE = 1 << 1,
WATCH_READ_WRITE = WATCH_READ | WATCH_WRITE
};
MessagePumpIOSForIO();
~MessagePumpIOSForIO() override;
// Have the current thread's message loop watch for a a situation in which
// reading/writing to the FD can be performed without blocking.
// Callers must provide a preallocated FileDescriptorWatcher object which
// can later be used to manage the lifetime of this event.
// If a FileDescriptorWatcher is passed in which is already attached to
// an event, then the effect is cumulative i.e. after the call |controller|
// will watch both the previous event and the new one.
// If an error occurs while calling this method in a cumulative fashion, the
// event previously attached to |controller| is aborted.
// Returns true on success.
// Must be called on the same thread the message_pump is running on.
bool WatchFileDescriptor(int fd,
bool persistent,
int mode,
FileDescriptorWatcher *controller,
Watcher *delegate);
void RemoveRunLoopSource(CFRunLoopSourceRef source);
void AddIOObserver(IOObserver* obs);
void RemoveIOObserver(IOObserver* obs);
private:
friend class MessagePumpIOSForIOTest;
void WillProcessIOEvent();
void DidProcessIOEvent();
static void HandleFdIOEvent(CFFileDescriptorRef fdref,
CFOptionFlags callback_types,
void* context);
ObserverList<IOObserver> io_observers_;
ThreadChecker watch_file_descriptor_caller_checker_;
base::WeakPtrFactory<MessagePumpIOSForIO> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(MessagePumpIOSForIO);
};
} // namespace base
#endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_IO_IOS_H_
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