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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 GRPC_INTERNAL_CORE_TRANSPORT_CONNECTIVITY_STATE_H
#define GRPC_INTERNAL_CORE_TRANSPORT_CONNECTIVITY_STATE_H
#include <grpc/grpc.h>
#include "src/core/iomgr/exec_ctx.h"
typedef struct grpc_connectivity_state_watcher {
/** we keep watchers in a linked list */
struct grpc_connectivity_state_watcher *next;
/** closure to notify on change */
grpc_closure *notify;
/** the current state as believed by the watcher */
grpc_connectivity_state *current;
} grpc_connectivity_state_watcher;
typedef struct {
/** current connectivity state */
grpc_connectivity_state current_state;
/** all our watchers */
grpc_connectivity_state_watcher *watchers;
/** a name to help debugging */
char *name;
} grpc_connectivity_state_tracker;
extern int grpc_connectivity_state_trace;
void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state init_state,
const char *name);
void grpc_connectivity_state_destroy(grpc_exec_ctx *exec_ctx,
grpc_connectivity_state_tracker *tracker);
/** Set connectivity state; not thread safe; access must be serialized with an
* external lock */
void grpc_connectivity_state_set(grpc_exec_ctx *exec_ctx,
grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state state,
const char *reason);
grpc_connectivity_state grpc_connectivity_state_check(
grpc_connectivity_state_tracker *tracker);
/** Return 1 if the channel should start connecting, 0 otherwise */
int grpc_connectivity_state_notify_on_state_change(
grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state *current, grpc_closure *notify);
/** Remove \a subscribed_notify from the list of closures to be called on a
* state change if present, returning 1. Otherwise, nothing is done and return
* 0. */
int grpc_connectivity_state_change_unsubscribe(
grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker,
grpc_closure *subscribed_notify);
#endif /* GRPC_INTERNAL_CORE_TRANSPORT_CONNECTIVITY_STATE_H */
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