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/*
*
* Copyright 2018 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 GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
#define GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
#include <functional>
#include <grpcpp/impl/codegen/call.h>
#include <grpcpp/impl/codegen/channel_interface.h>
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen_interface.h>
#include <grpcpp/impl/codegen/status.h>
// Forward declarations
namespace grpc_core {
class CQCallbackInterface;
};
namespace grpc {
namespace internal {
// The contract on these tags is that they are single-shot. They must be
// constructed and then fired at exactly one point. There is no expectation
// that they can be reused without reconstruction.
class CallbackWithStatusTag {
public:
// always allocated against a call arena, no memory free required
static void operator delete(void* ptr, std::size_t size) {
assert(size == sizeof(CallbackWithStatusTag));
}
// This operator should never be called as the memory should be freed as part
// of the arena destruction. It only exists to provide a matching operator
// delete to the operator new so that some compilers will not complain (see
// https://github.com/grpc/grpc/issues/11301) Note at the time of adding this
// there are no tests catching the compiler warning.
static void operator delete(void*, void*) { assert(0); }
CallbackWithStatusTag(grpc_call* call, std::function<void(Status)> f,
CompletionQueueTag* ops);
~CallbackWithStatusTag() {}
void* tag() { return static_cast<void*>(impl_); }
Status* status_ptr() { return status_; }
CompletionQueueTag* ops() { return ops_; }
// force_run can not be performed on a tag if operations using this tag
// have been sent to PerformOpsOnCall. It is intended for error conditions
// that are detected before the operations are internally processed.
void force_run(Status s);
private:
grpc_core::CQCallbackInterface* impl_;
Status* status_;
CompletionQueueTag* ops_;
};
class CallbackWithSuccessTag {
public:
// always allocated against a call arena, no memory free required
static void operator delete(void* ptr, std::size_t size) {
assert(size == sizeof(CallbackWithSuccessTag));
}
// This operator should never be called as the memory should be freed as part
// of the arena destruction. It only exists to provide a matching operator
// delete to the operator new so that some compilers will not complain (see
// https://github.com/grpc/grpc/issues/11301) Note at the time of adding this
// there are no tests catching the compiler warning.
static void operator delete(void*, void*) { assert(0); }
CallbackWithSuccessTag(grpc_call* call, std::function<void(bool)> f,
CompletionQueueTag* ops);
void* tag() { return static_cast<void*>(impl_); }
CompletionQueueTag* ops() { return ops_; }
// force_run can not be performed on a tag if operations using this tag
// have been sent to PerformOpsOnCall. It is intended for error conditions
// that are detected before the operations are internally processed.
void force_run(bool ok);
private:
grpc_core::CQCallbackInterface* impl_;
CompletionQueueTag* ops_;
};
} // namespace internal
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
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