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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <unordered_map>
#include <unordered_set>
#include "hci/acl_manager.h"
#include "l2cap/cid.h"
#include "l2cap/internal/ilink.h"
#include "l2cap/psm.h"
#include "l2cap/security_policy.h"
#include "os/handler.h"
#include "os/log.h"
namespace bluetooth {
namespace l2cap {
namespace internal {
class DynamicChannelImpl;
// Helper class for keeping channels in a Link. It allocates and frees Channel object, and supports querying whether a
// channel is in use
class DynamicChannelAllocator {
public:
DynamicChannelAllocator(l2cap::internal::ILink* link, os::Handler* l2cap_handler)
: link_(link), l2cap_handler_(l2cap_handler) {
ASSERT(link_ != nullptr);
ASSERT(l2cap_handler_ != nullptr);
}
// Allocates a channel. If psm is used, OR the remote cid already exists, return nullptr.
// NOTE: The returned DynamicChannelImpl object is still owned by the channel allocator, NOT the client.
std::shared_ptr<DynamicChannelImpl> AllocateChannel(Psm psm, Cid remote_cid, SecurityPolicy security_policy);
std::shared_ptr<DynamicChannelImpl> AllocateReservedChannel(Cid reserved_cid, Psm psm, Cid remote_cid,
SecurityPolicy security_policy);
// Gives an unused Cid to be used for opening a channel. If a channel is used, call AllocateReservedChannel. If no
// longer needed, use FreeChannel.
Cid ReserveChannel();
// Frees a channel. If psm doesn't exist, it will crash
void FreeChannel(Cid cid);
bool IsPsmUsed(Psm psm) const;
std::shared_ptr<DynamicChannelImpl> FindChannelByCid(Cid cid);
std::shared_ptr<DynamicChannelImpl> FindChannelByRemoteCid(Cid cid);
// Returns number of open, but not reserved channels
size_t NumberOfChannels() const;
void OnAclDisconnected(hci::ErrorCode hci_status);
private:
l2cap::internal::ILink* link_;
os::Handler* l2cap_handler_;
std::unordered_set<Cid> used_cid_;
std::unordered_map<Cid, std::shared_ptr<DynamicChannelImpl>> channels_;
std::unordered_set<Cid> used_remote_cid_;
};
} // namespace internal
} // namespace l2cap
} // namespace bluetooth
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