/Users/deen/code/yugabyte-db/src/yb/tserver/read_query.h
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1 | | // Copyright (c) YugaByte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | // |
13 | | |
14 | | #ifndef YB_TSERVER_READ_QUERY_H |
15 | | #define YB_TSERVER_READ_QUERY_H |
16 | | |
17 | | #include "yb/common/common_net.pb.h" |
18 | | #include "yb/common/read_hybrid_time.h" |
19 | | #include "yb/common/transaction.h" |
20 | | |
21 | | #include "yb/rpc/rpc_context.h" |
22 | | #include "yb/rpc/thread_pool.h" |
23 | | |
24 | | #include "yb/server/clock.h" |
25 | | |
26 | | #include "yb/tablet/abstract_tablet.h" |
27 | | |
28 | | #include "yb/tserver/tserver_fwd.h" |
29 | | #include "yb/tserver/tserver.fwd.h" |
30 | | |
31 | | namespace yb { |
32 | | namespace tserver { |
33 | | |
34 | | // Actually it would be better to rely on TabletServerIf::tablet_peer_lookup, but master |
35 | | // has pretty different logic in obtaining read tablet. |
36 | | // Moreover in master we have several places to get tablet, but all of them has different logic. |
37 | | // So it is good example of bad design that was not refactored in a proper time. |
38 | | // And now it is non trivial task to merge all such places into a single one. |
39 | | class ReadTabletProvider { |
40 | | public: |
41 | | virtual Result<std::shared_ptr<tablet::AbstractTablet>> GetTabletForRead( |
42 | | const TabletId& tablet_id, tablet::TabletPeerPtr tablet_peer, |
43 | | YBConsistencyLevel consistency_level, AllowSplitTablet allow_split_tablet) = 0; |
44 | | |
45 | 160 | virtual ~ReadTabletProvider() = default; |
46 | | }; |
47 | | |
48 | | void PerformRead( |
49 | | TabletServerIf* server, ReadTabletProvider* read_tablet_provider, |
50 | | const ReadRequestPB* req, ReadResponsePB* resp, rpc::RpcContext context); |
51 | | |
52 | | } // namespace tserver |
53 | | } // namespace yb |
54 | | |
55 | | #endif // YB_TSERVER_READ_QUERY_H |