/*
 *
 * 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 GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_SHARED_RESOURCE_H
#define GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_SHARED_RESOURCE_H

#include <grpc/support/port_platform.h>

#include <grpc/grpc.h>
#include <grpc/support/sync.h>

#include "src/core/lib/gprpp/thd.h"
#include "src/core/lib/iomgr/pollset_set.h"
#include "src/core/lib/surface/completion_queue.h"

/**
 * Main struct containing ALTS shared resources used when
 * employing the dedicated completion queue and thread.
 */
typedef struct alts_shared_resource_dedicated {
  grpc_core::Thread thread;
  grpc_completion_queue* cq;
  grpc_pollset_set* interested_parties;
  grpc_cq_completion storage;
  gpr_mu mu;
  grpc_channel* channel;
} alts_shared_resource_dedicated;

/* This method returns the address of alts_shared_resource_dedicated
 * object shared by all TSI handshakes.
 */
alts_shared_resource_dedicated* grpc_alts_get_shared_resource_dedicated(void);

/**
 * This method destroys the alts_shared_resource_dedicated object
 * shared by all TSI handshakes. The applicaiton is responsible for
 * invoking the API before calling grpc_shutdown().
 */
void grpc_alts_shared_resource_dedicated_shutdown();

/**
 * This method initializes the alts_shared_resource_dedicated object
 * shared by all TSI handshakes. The application is responsible for
 * invoking the API after calling grpc_init();
 */
void grpc_alts_shared_resource_dedicated_init();

/**
 * This method populates various fields of the alts_shared_resource_dedicated
 * object shared by all TSI handshakes and start the dedicated thread.
 * The API will be invoked by the caller in a lazy manner. That is,
 * it will get invoked when ALTS TSI handshake occurs for the first time.
 */
void grpc_alts_shared_resource_dedicated_start(
    const char* handshaker_service_url);

#endif /* GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_SHARED_RESOURCE_H \
        */