May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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390
11
章 メッセージ通信と統合
それでは起動しましょう。次のように
PUB
ソケットと
SUB
ソケットが正しく接続するようにして、
チャットアプリケーションのインスタンスを
3
つ起動します。
$ node app --http 8080 --pub 5000 --sub 5001 --sub 5002
$ node app --http 8081 --pub 5001 --sub 5000 --sub 5002
$ node app --http 8082 --pub 5002 --sub 5000 --sub 5001
最初のコマンドは、
HTTP
サーバがポート
8080
をリッスンし、
PUB
ソケットをポート
5000
に、
SUB
ソケットをポート
5001
と
5002
に接続するようにしてインスタンスを起動します。これは、他の
2
つの
インスタンスの
PUB
ソケットがこれらのポートをリッスンすることを想定しています。残りの
2
つのコ
マンドも同様です。
さて最初に
わかることは、
PUB
ソケットに対応するポートが使用可能でなくても
ØMQ
がエラーを出
さないことです。たとえば、
1
番目のコマンドの時点では、ポート
5001
と
5002
をリッスンしているも
のはありません。それでも
ØMQ
は何のエラーも出しません。それは一定期間ごとにこれらのポートへ
の接続を試みる再接続の仕組みが
ØMQ
にあるためです。この機能は、いずれかのノードがダウンや
再起動をした場合に特に便利です。同じく「寛大な」処理が
PUB
ソケットに適用されています。つまり、
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and much more.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.