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-rw-r--r--src/core/ext/client_config/subchannel_call_holder.h99
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diff --git a/src/core/ext/client_config/subchannel_call_holder.h b/src/core/ext/client_config/subchannel_call_holder.h
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--- a/src/core/ext/client_config/subchannel_call_holder.h
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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_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H
-#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H
-
-#include "src/core/ext/client_config/subchannel.h"
-#include "src/core/lib/iomgr/polling_entity.h"
-
-/** Pick a subchannel for grpc_subchannel_call_holder;
- Return 1 if subchannel is available immediately (in which case on_ready
- should not be called), or 0 otherwise (in which case on_ready should be
- called when the subchannel is available) */
-typedef int (*grpc_subchannel_call_holder_pick_subchannel)(
- grpc_exec_ctx *exec_ctx, void *arg, grpc_metadata_batch *initial_metadata,
- uint32_t initial_metadata_flags,
- grpc_connected_subchannel **connected_subchannel, grpc_closure *on_ready);
-
-typedef enum {
- GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING,
- GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL
-} grpc_subchannel_call_holder_creation_phase;
-
-/** Wrapper for holding a pointer to grpc_subchannel_call, and the
- associated machinery to create such a pointer.
- Handles queueing of stream ops until a call object is ready, waiting
- for initial metadata before trying to create a call object,
- and handling cancellation gracefully.
-
- The channel filter uses this as their call_data. */
-typedef struct grpc_subchannel_call_holder {
- /** either 0 for no call, 1 for cancelled, or a pointer to a
- grpc_subchannel_call */
- gpr_atm subchannel_call;
- /** Helper function to choose the subchannel on which to create
- the call object. Channel filter delegates to the load
- balancing policy (once it's ready). */
- grpc_subchannel_call_holder_pick_subchannel pick_subchannel;
- void *pick_subchannel_arg;
-
- gpr_mu mu;
-
- grpc_subchannel_call_holder_creation_phase creation_phase;
- grpc_connected_subchannel *connected_subchannel;
- grpc_polling_entity *pollent;
-
- grpc_transport_stream_op *waiting_ops;
- size_t waiting_ops_count;
- size_t waiting_ops_capacity;
-
- grpc_closure next_step;
-
- grpc_call_stack *owning_call;
-} grpc_subchannel_call_holder;
-
-void grpc_subchannel_call_holder_init(
- grpc_subchannel_call_holder *holder,
- grpc_subchannel_call_holder_pick_subchannel pick_subchannel,
- void *pick_subchannel_arg, grpc_call_stack *owning_call);
-void grpc_subchannel_call_holder_destroy(grpc_exec_ctx *exec_ctx,
- grpc_subchannel_call_holder *holder);
-
-void grpc_subchannel_call_holder_perform_op(grpc_exec_ctx *exec_ctx,
- grpc_subchannel_call_holder *holder,
- grpc_transport_stream_op *op);
-char *grpc_subchannel_call_holder_get_peer(grpc_exec_ctx *exec_ctx,
- grpc_subchannel_call_holder *holder);
-
-#endif /* GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_CALL_HOLDER_H */