Chapter 2. Compiling Protobuf Schema

Data Grid uses the ProtoStream API to store data as Protobuf-encoded entries.

Protobuf is a language-neutral format that allows clients to create and retrieve entries in remote caches using both Hot Rod and REST endpoints.

2.1. Compiling Protobuf schema on Red Hat Enterprise Linux (RHEL)
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Compile Protobuf schema, .proto files, into C++ header and source files to describe your data to Data Grid.

Prerequisites

Install the Protobuf library and protobuf-devel package.
```
# yum install protobuf
# yum install protobuf-devel
```

Procedure

Set the LD_LIBRARY_PATH environment variable, if it is not already set.
```
# export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/lib64
```
Compile Protobuf schema for the Hot Rod C++ client as required.
```
# /bin/protoc --cpp_out dllexport_decl=HR_PROTO_EXPORT:/path/to/output/ $FILE
```
HR_PROTO_EXPORT is a macro that the Hot Rod C++ client expands when it compiles the Protobuf schema.
Register your Protobuf schema with Data Grid if you plan to use queries.

Compile Protobuf schema, .proto files, into C++ header and source files to describe your data to Data Grid.

Procedure

Open a command prompt to the installation directory for the Hot Rod C++ client.
Compile Protobuf schema for the Hot Rod C++ client as required.
```
bin\protoc --cpp_out dllexport_decl=HR_PROTO_EXPORT:path\to\output\ $FILE
```
HR_PROTO_EXPORT is a macro that the Hot Rod C++ client expands when it compiles the Protobuf schema.
Register your Protobuf schema with Data Grid if you plan to use queries.