fix protobuf Checkstyle

[seagle-yuan]

move Generated java file from src/main/java to src/protobuf/java
add proto maven plugin
add proto dependency

[codecov]

Codecov Report

Merging #1881 (86c341b) into master (2af01bc) will decrease coverage by 0.59%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1881      +/-   ##
============================================
- Coverage     71.11%   70.52%   -0.60%     
+ Complexity      963      961       -2     
============================================
  Files           452      452              
  Lines         38405    38656     +251     
  Branches       5418     5526     +108     
============================================
- Hits          27312    27261      -51     
- Misses         8436     8724     +288     
- Partials       2657     2671      +14     

Impacted Files	Coverage Δ
...hugegraph/backend/store/raft/rpc/RaftRequests.java	20.53% <ø> (ø)
.../java/com/baidu/hugegraph/task/HugeServerInfo.java	73.91% <0.00%> (-0.73%)	⬇️
...ugegraph/backend/store/raft/StoreStateMachine.java	65.76% <0.00%> (+0.90%)	⬆️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	78.48% <0.00%> (+1.16%)	⬆️
...va/com/baidu/hugegraph/util/collection/IntSet.java	75.00% <0.00%> (+1.27%)	⬆️
...hugegraph/backend/store/raft/rpc/RpcForwarder.java	71.18% <0.00%> (+1.69%)	⬆️
.../hugegraph/backend/store/rocksdb/RocksDBTable.java	68.49% <0.00%> (+2.05%)	⬆️

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[javeme]

there are some conflicts, please rebase the latest code

[imbajin]

Thanks, and could u explain why the files that generated by protobuf has changed a lot? (version update? or just check style inconsistent?)

if we generate a new proto java file, how to keep the code style? (rely on the maven plugin?)

[imbajin]

do we include it in commons-rpc module?

[seagle-yuan]

1、I compiled protobuf with different version. and found that old file compliled with likely 2.6.1 version. this version released in Apr, 2015.
https://mvnrepository.com/artifact/com.google.protobuf/protoc

2、if we add protobuf plugin. and generate file to src/protobuf/java path. this path will be ignored to check

3、Through the dependency check, found these dependencies already exist.

[INFO] com.baidu.hugegraph:hugegraph-rpc:jar:2.0.1:compile
[INFO] +- com.lmax:disruptor:jar:3.3.7:compile
[INFO] \- com.alipay.sofa:sofa-rpc-all:jar:5.7.6:compile
[INFO]    +- com.alipay.sofa:tracer-core:jar:3.0.8:compile
[INFO]    |  +- io.opentracing:opentracing-api:jar:0.22.0:compile
[INFO]    |  +- io.opentracing:opentracing-noop:jar:0.22.0:compile
[INFO]    |  +- io.opentracing:opentracing-mock:jar:0.22.0:compile
[INFO]    |  \- io.opentracing:opentracing-util:jar:0.22.0:compile
[INFO]    +- com.alipay.sofa.lookout:lookout-api:jar:1.4.1:compile
[INFO]    +- io.swagger:swagger-core:jar:1.5.18:compile
[INFO]    |  +- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.9.3:compile
[INFO]    |  +- io.swagger:swagger-models:jar:1.5.18:compile
[INFO]    |  |  \- io.swagger:swagger-annotations:jar:1.5.18:compile
[INFO]    |  \- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO]    +- io.grpc:grpc-netty-shaded:jar:1.28.0:compile
[INFO]    |  \- io.grpc:grpc-core:jar:1.28.0:compile (version selected from constraint [1.28.0,1.28.0])
[INFO]    |     +- io.grpc:grpc-api:jar:1.28.0:compile (version selected from constraint [1.28.0,1.28.0])
[INFO]    |     |  \- io.grpc:grpc-context:jar:1.28.0:compile
[INFO]    |     +- com.google.code.gson:gson:jar:2.8.6:compile
[INFO]    |     +- com.google.android:annotations:jar:4.1.1.4:compile
[INFO]    |     \- io.perfmark:perfmark-api:jar:0.19.0:compile
[INFO]    +- io.grpc:grpc-protobuf:jar:1.6.1:provided
[INFO]    |  +- com.google.protobuf:protobuf-java-util:jar:3.3.1:provided
[INFO]    |  +- com.google.api.grpc:proto-google-common-protos:jar:0.1.9:provided
[INFO]    |  \- io.grpc:grpc-protobuf-lite:jar:1.6.1:provided
[INFO]    \- io.grpc:grpc-stub:jar:1.6.1:provided

[imbajin]

TODO: we need use a unify version for rpc & common (or just include commons package maybe)