April 2026
392 pages
6h 20m
Japanese
Content preview from APIハンズオンラーニング ―手を動かして学ぶAPIの設計と実装
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8章gRPC
RPCはRemote Procedure Callの略である。その名前が示すように、RPCというAPIスタイルはプロシージャー（関数）の遠隔呼び出しに重点を置いている。RPCのAPIはインテント指向のインターフェースが特徴であり、インテントは「CreateUser」や「GenerateReport」のような特定のアクション（操作）を表す名前を持つ。このようなアプローチはRESTとは正反対である。RESTは「User」や「Report」のようなリソースの取得と変更に重点を置いている†1。そしてこれらのリソースに対してGET、POST、PUT、DELETEという標準化されたHTTPのメソッドを利用する。
[†1] 「5.4 APIの成熟度モデル」で解説した。
gRPC†2は、現時点でおそらく最も広く採用されているRPCの実装である†3。Googleがこのプロジェクトを開始し、2017年にCloud Native Computing Foundationに寄贈された。Webサイトのアドレスはhttps://grpc.ioである。
[†2] 「g」の意味はリリースのたびに遊び心で変わる。gRPCのGitHubリポジトリーにあるdoc/g_stands_for.md（https://oreil.ly/QTdMM）で、それぞれの意味が一覧されている。
[†3] gRPC以外にも、Apache Thrift（https://oreil.ly/3llo2）、tRPC（https://oreil.ly/A8n2b）、JSON-RPC（https://www.jsonrpc.org）など、いくつかのRPCベースの技術が存在する。
RPCの全体的な目標について説明した後、この章ではgRPCとその機能について紹介する。Protocol ...
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