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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_CLIENT_CONFIG_SUBCHANNEL_H
#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_H
#include "src/core/channel/channel_stack.h"
#include "src/core/client_config/connector.h"
#include "src/core/transport/connectivity_state.h"
/** A (sub-)channel that knows how to connect to exactly one target
address. Provides a target for load balancing. */
typedef struct grpc_subchannel grpc_subchannel;
typedef struct grpc_subchannel_call grpc_subchannel_call;
typedef struct grpc_subchannel_args grpc_subchannel_args;
#ifdef GRPC_STREAM_REFCOUNT_DEBUG
#define GRPC_SUBCHANNEL_REF(p, r) \
grpc_subchannel_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) \
grpc_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_CALL_REF(p, r) \
grpc_subchannel_call_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
grpc_subchannel_call_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_REF_EXTRA_ARGS \
, const char *file, int line, const char *reason
#else
#define GRPC_SUBCHANNEL_REF(p, r) grpc_subchannel_ref((p))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) grpc_subchannel_unref((cl), (p))
#define GRPC_SUBCHANNEL_CALL_REF(p, r) grpc_subchannel_call_ref((p))
#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
grpc_subchannel_call_unref((cl), (p))
#define GRPC_SUBCHANNEL_REF_EXTRA_ARGS
#endif
void grpc_subchannel_ref(grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_call_ref(grpc_subchannel_call *call
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_call_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *call
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
/** construct a subchannel call (possibly asynchronously).
*
* If the returned status is 1, the call will return immediately and \a target
* will point to a connected \a subchannel_call instance. Note that \a notify
* will \em not be invoked in this case.
* Otherwise, if the returned status is 0, the subchannel call will be created
* asynchronously, invoking the \a notify callback upon completion. */
int grpc_subchannel_create_call(grpc_exec_ctx *exec_ctx,
grpc_subchannel *subchannel,
grpc_pollset *pollset, gpr_atm *target,
grpc_closure *notify);
/** cancel \a call in the waiting state. */
void grpc_subchannel_cancel_create_call(grpc_exec_ctx *exec_ctx,
grpc_subchannel *subchannel,
gpr_atm *target);
/** process a transport level op */
void grpc_subchannel_process_transport_op(grpc_exec_ctx *exec_ctx,
grpc_subchannel *subchannel,
grpc_transport_op *op);
/** poll the current connectivity state of a channel */
grpc_connectivity_state grpc_subchannel_check_connectivity(
grpc_subchannel *channel);
/** call notify when the connectivity state of a channel changes from *state.
Updates *state with the new state of the channel */
void grpc_subchannel_notify_on_state_change(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel,
grpc_connectivity_state *state,
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_subchannel_state_change_unsubscribe(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel,
grpc_closure *subscribed_notify);
/** express interest in \a channel's activities through \a pollset. */
void grpc_subchannel_add_interested_party(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel,
grpc_pollset *pollset);
/** stop following \a channel's activity through \a pollset. */
void grpc_subchannel_del_interested_party(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel,
grpc_pollset *pollset);
/** continue processing a transport op */
void grpc_subchannel_call_process_op(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *subchannel_call,
grpc_transport_stream_op *op);
/** continue querying for peer */
char *grpc_subchannel_call_get_peer(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *subchannel_call);
grpc_call_stack *grpc_subchannel_call_get_call_stack(
grpc_subchannel_call *subchannel_call);
struct grpc_subchannel_args {
/** Channel filters for this channel - wrapped factories will likely
want to mutate this */
const grpc_channel_filter **filters;
/** The number of filters in the above array */
size_t filter_count;
/** Channel arguments to be supplied to the newly created channel */
const grpc_channel_args *args;
/** Address to connect to */
struct sockaddr *addr;
size_t addr_len;
/** metadata context to use */
grpc_mdctx *mdctx;
/** master channel */
grpc_channel *master;
};
/** create a subchannel given a connector */
grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
grpc_subchannel_args *args);
/** Return the metadata context associated with the subchannel */
grpc_mdctx *grpc_subchannel_get_mdctx(grpc_subchannel *subchannel);
/** Return the master channel associated with the subchannel */
grpc_channel *grpc_subchannel_get_master(grpc_subchannel *subchannel);
#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_H */
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