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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_CHANNEL_INTERFACE_H
#define GRPCXX_CHANNEL_INTERFACE_H
#include <memory>
#include <grpc/grpc.h>
#include <grpc++/status.h>
#include <grpc++/impl/call.h>
struct grpc_call;
namespace grpc {
class Call;
class CallOpBuffer;
class ClientContext;
class CompletionQueue;
class RpcMethod;
class ChannelInterface : public CallHook,
public std::enable_shared_from_this<ChannelInterface> {
public:
virtual ~ChannelInterface() {}
virtual void* RegisterMethod(const char* method_name) = 0;
virtual Call CreateCall(const RpcMethod& method, ClientContext* context,
CompletionQueue* cq) = 0;
// Get the current channel state. If the channel is in IDLE and try_to_connect
// is set to true, try to connect.
virtual grpc_connectivity_state GetState(bool try_to_connect) = 0;
// Return the tag on cq when the channel state is changed or deadline expires.
// GetState needs to called to get the current state.
template <typename T>
void NotifyOnStateChange(grpc_connectivity_state last_observed, T deadline,
CompletionQueue* cq, void* tag) {
TimePoint<T> deadline_tp(deadline);
NotifyOnStateChangeImpl(last_observed, deadline_tp.raw_time(), cq, tag);
}
// Blocking wait for channel state change or deadline expiration.
// GetState needs to called to get the current state.
template <typename T>
bool WaitForStateChange(grpc_connectivity_state last_observed, T deadline) {
TimePoint<T> deadline_tp(deadline);
return WaitForStateChangeImpl(last_observed, deadline_tp.raw_time());
}
private:
virtual void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline,
CompletionQueue* cq, void* tag) = 0;
virtual bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
gpr_timespec deadline) = 0;
};
} // namespace grpc
#endif // GRPCXX_CHANNEL_INTERFACE_H
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