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// Copyright 2014 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 MOJO_COMMON_WEAK_BINDING_SET_H_
#define MOJO_COMMON_WEAK_BINDING_SET_H_
#include <algorithm>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
namespace mojo {
template <typename Interface>
class WeakBinding;
// Use this class to manage a set of weak pointers to bindings each of which is
// owned by the pipe they are bound to.
template <typename Interface>
class WeakBindingSet : public ErrorHandler {
public:
WeakBindingSet() : error_handler_(nullptr) {}
~WeakBindingSet() { CloseAllBindings(); }
void set_error_handler(ErrorHandler* error_handler) {
error_handler_ = error_handler;
}
void AddBinding(Interface* impl, InterfaceRequest<Interface> request) {
auto binding = new WeakBinding<Interface>(impl, request.Pass());
binding->set_error_handler(this);
bindings_.push_back(binding->GetWeakPtr());
}
void CloseAllBindings() {
for (const auto& it : bindings_) {
if (it)
it->Close();
}
bindings_.clear();
}
private:
// ErrorHandler implementation.
void OnConnectionError() override {
// Clear any deleted bindings.
bindings_.erase(
std::remove_if(bindings_.begin(), bindings_.end(),
[](const base::WeakPtr<WeakBinding<Interface>>& p) {
return p.get() == nullptr;
}),
bindings_.end());
if (error_handler_)
error_handler_->OnConnectionError();
}
ErrorHandler* error_handler_;
std::vector<base::WeakPtr<WeakBinding<Interface>>> bindings_;
DISALLOW_COPY_AND_ASSIGN(WeakBindingSet);
};
template <typename Interface>
class WeakBinding : public ErrorHandler {
public:
WeakBinding(Interface* impl, InterfaceRequest<Interface> request)
: binding_(impl, request.Pass()),
error_handler_(nullptr),
weak_ptr_factory_(this) {
binding_.set_error_handler(this);
}
~WeakBinding() override {}
void set_error_handler(ErrorHandler* error_handler) {
error_handler_ = error_handler;
}
base::WeakPtr<WeakBinding> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
void Close() { binding_.Close(); }
// ErrorHandler implementation.
void OnConnectionError() override {
ErrorHandler* error_handler = error_handler_;
delete this;
if (error_handler)
error_handler->OnConnectionError();
}
private:
mojo::Binding<Interface> binding_;
ErrorHandler* error_handler_;
base::WeakPtrFactory<WeakBinding> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WeakBinding);
};
} // namespace mojo
#endif // MOJO_COMMON_WEAK_BINDING_SET_H_
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