| /* |
| * |
| * 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_CHANNEL_SUBCHANNEL_CALL_HOLDER_H |
| #define GRPC_INTERNAL_CORE_CHANNEL_SUBCHANNEL_CALL_HOLDER_H |
| |
| #include "src/core/client_config/subchannel.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, |
| 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. |
| |
| Both the channel and uchannel filter use 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); uchannel returns |
| immediately */ |
| 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_pollset *pollset; |
| |
| 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 |