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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/tabs/public/supports_handles.h"
#include "base/types/pass_key.h"
namespace tabs::internal {
SupportsHandlesBase::SupportsHandlesBase(HandleFactory& handle_factory)
: handle_factory_(handle_factory),
handle_value_(
handle_factory.AssignHandleValue(base::PassKey<SupportsHandlesBase>(),
this)) {}
SupportsHandlesBase::~SupportsHandlesBase() {
handle_factory_->FreeHandleValue(base::PassKey<SupportsHandlesBase>(),
handle_value_);
}
SupportsHandlesBase* SupportsHandlesBase::LookupHandle(HandleFactory& factory,
int32_t handle_value) {
return factory.LookupObject(base::PassKey<SupportsHandlesBase>(),
handle_value);
}
HandleFactory::HandleFactory() = default;
HandleFactory::~HandleFactory() = default;
int32_t HandleFactory::AssignHandleValue(base::PassKey<SupportsHandlesBase>,
StoredPointerType object) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_);
CHECK(object);
// Use the next available handle value; it is an error if the value rolls
// back over to zero.
++last_handle_value_;
CHECK(last_handle_value_)
<< "Fatal handle reuse! Please curtail object creation.";
lookup_table_.emplace(last_handle_value_, object);
return last_handle_value_;
}
void HandleFactory::FreeHandleValue(base::PassKey<SupportsHandlesBase>,
int32_t handle_value) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_);
CHECK(lookup_table_.erase(handle_value));
}
HandleFactory::StoredPointerType HandleFactory::LookupObject(
base::PassKey<SupportsHandlesBase>,
int32_t handle_value) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_);
const auto it = lookup_table_.find(handle_value);
return it != lookup_table_.end() ? it->second : nullptr;
}
} // namespace tabs::internal
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