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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/printing/cups_printers_manager_proxy.h"
#include <memory>
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "chrome/browser/ash/printing/cups_printers_manager.h"
#include "chromeos/printing/printer_configuration.h"
namespace ash {
namespace {
class ProxyImpl : public CupsPrintersManagerProxy,
public CupsPrintersManager::Observer {
public:
ProxyImpl() = default;
~ProxyImpl() override {
// Verify that the active manager has been unset when we're cleaned up.
DCHECK(active_manager_ == nullptr);
}
void AddObserver(CupsPrintersManager::Observer* observer) override {
observers_.AddObserver(observer);
}
void RemoveObserver(CupsPrintersManager::Observer* observer) override {
observers_.RemoveObserver(observer);
}
void SetManager(CupsPrintersManager* manager) override {
if (active_manager_ != nullptr) {
DVLOG(1) << "Discarding manager when one is already set. This should "
"only happen during testing.";
return;
}
active_manager_ = manager;
active_manager_->AddObserver(this);
// Emit a change event to wake up any observers.
// Emitting for saved printers is an arbitrary decision.
OnPrintersChanged(
chromeos::PrinterClass::kSaved,
active_manager_->GetPrinters(chromeos::PrinterClass::kSaved));
}
void RemoveManager(CupsPrintersManager* manager) override {
if (!active_manager_) {
// It's possible no manager was ever attached and we ignore it.
return;
}
if (manager != active_manager_) {
// Ignore removals of unattached managers.
return;
}
active_manager_->RemoveObserver(this);
active_manager_ = nullptr;
}
// CupsPrintersManager::Observer overrides
void OnPrintersChanged(
chromeos::PrinterClass printer_class,
const std::vector<chromeos::Printer>& printers) override {
for (auto& observer : observers_) {
observer.OnPrintersChanged(printer_class, printers);
}
}
private:
// The manager for which we are forwarding events.
raw_ptr<CupsPrintersManager> active_manager_ = nullptr;
// TODO(skau): Change to CheckedObservers
base::ObserverList<CupsPrintersManager::Observer>::Unchecked observers_;
};
} // namespace
// static
std::unique_ptr<CupsPrintersManagerProxy> CupsPrintersManagerProxy::Create() {
return std::make_unique<ProxyImpl>();
}
} // namespace ash
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