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//
// Copyright 2020 gRPC authors.
//
// 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.
//
#ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_DYNAMIC_FILTERS_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_DYNAMIC_FILTERS_H
#include <grpc/support/port_platform.h>
#include <vector>
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/gpr/time_precise.h"
#include "src/core/lib/gprpp/arena.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/polling_entity.h"
namespace grpc_core {
class DynamicFilters : public RefCounted<DynamicFilters> {
public:
// Implements the interface of RefCounted<>.
class Call {
public:
struct Args {
RefCountedPtr<DynamicFilters> channel_stack;
grpc_polling_entity* pollent;
grpc_slice path;
gpr_cycle_counter start_time;
grpc_millis deadline;
Arena* arena;
grpc_call_context_element* context;
CallCombiner* call_combiner;
};
Call(Args args, grpc_error_handle* error);
// Continues processing a transport stream op batch.
void StartTransportStreamOpBatch(grpc_transport_stream_op_batch* batch);
// Sets the 'then_schedule_closure' argument for call stack destruction.
// Must be called once per call.
void SetAfterCallStackDestroy(grpc_closure* closure);
// Interface of RefCounted<>.
RefCountedPtr<Call> Ref() GRPC_MUST_USE_RESULT;
RefCountedPtr<Call> Ref(const DebugLocation& location,
const char* reason) GRPC_MUST_USE_RESULT;
// When refcount drops to 0, destroys itself and the associated call stack,
// but does NOT free the memory because it's in the call arena.
void Unref();
void Unref(const DebugLocation& location, const char* reason);
private:
// Allow RefCountedPtr<> to access IncrementRefCount().
template <typename T>
friend class RefCountedPtr;
// Interface of RefCounted<>.
void IncrementRefCount();
void IncrementRefCount(const DebugLocation& location, const char* reason);
static void Destroy(void* arg, grpc_error_handle error);
RefCountedPtr<DynamicFilters> channel_stack_;
grpc_closure* after_call_stack_destroy_ = nullptr;
};
static RefCountedPtr<DynamicFilters> Create(
const grpc_channel_args* args,
std::vector<const grpc_channel_filter*> filters);
explicit DynamicFilters(grpc_channel_stack* channel_stack)
: channel_stack_(channel_stack) {}
~DynamicFilters() override;
RefCountedPtr<Call> CreateCall(Call::Args args, grpc_error_handle* error);
private:
grpc_channel_stack* channel_stack_;
};
} // namespace grpc_core
#endif // GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_DYNAMIC_FILTERS_H
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