val fruits = List("apple", "banana", "avocado", "papaya") val countsToFruits = // count how many 'a' in each fruit fruits.groupBy(fruit => fruit.count(_ == 'a')) for (count, fruits) <- countsToFruits do println(s"with 'a' × $count = $fruits") // prints: with 'a' × 1 = List(apple) // prints: with 'a' × 2 = List(avocado) // prints: with 'a' × 3 = List(banana, papaya)
Kohsuke here. This is a message for my fellow Jenkins developers. Jenkins has been on an amazing run, but I believe we are trapped in a local optimum, and losing appeal to people who fall outside of our traditional sweet spot. We need to take on new efforts to solve this. One is “cloud native Jenkins” that creates a flavor of Jenkins that runs well on Kubernetes. The other is “gear shift”, where w
I am using rabbitmq and a simple python sample from here together with docker-compose. My problem is that I need to wait for rabbitmq to be fully started. From what I searched so far, I don't know how to wait with container x (in my case worker) until y (rabbitmq) is started. I found this blog post where he checks if the other host is online. I also found this docker command: wait Usage: docker wa
[default-tests-sbt] $ /usr/lib/jvm/java-8-oracle/bin/java -Dsbt.log.noformat=true -Xmx2G -jar /var/lib/jenkins/tools/org.jvnet.hudson.plugins.SbtPluginBuilder_SbtInstallation/SBT_default_launcher/bin/sbt-launch.jar clean test:clean buildUmp test [info] Loading project definition from /var/lib/jenkins/workspace/default-tests-sbt/project [info] Set current project to ump (in build file:/var/lib/jenk
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MailSlurper is a small SMTP mail server that slurps mail into oblivion! MailSlurper is perfect for individual developers or small teams writing mail-enabled applications that wish to test email functionality without the risk or hassle of installing and configuring a full-blown email server. It's simple to use! Simply set up MailSlurper, configure your code and/or application server to send mail th
I've noticed that the "preferred" method of setting the system hostname is fundamentally different between Red Hat/CentOS and Debian/Ubuntu systems. CentOS documentation and the RHEL deployment guide say the hostname should be the FQDN: HOSTNAME=<value>, where <value> should be the Fully Qualified Domain Name (FQDN), such as hostname.example.com, but can be whatever hostname is necessary. The RHEL
The primary objective of IT automation is to make processes related to infrastructure faster, more secure and error-free. Chef SaaS enables you to automate your IT infrastructure with the power of the cloud. Now, all your favorite Chef tools are available as SaaS. No setup hassles, no maintenance and no extra resources required. Read on to learn more.
Setting up Jenkins is a complex process, as both Jenkins and its plugins require some tuning and configuration, with dozens of parameters to set within the web UI manage section. Experienced Jenkins users rely on groovy init scripts to customize Jenkins and enforce the desired state. Those scripts directly invoke Jenkins API and, as such, can do everything (at your own risk). But they also require
JVM は ホスト名を解決すると IP アドレスをキャッシュします。 発生する問題 あるサーバのホスト名が変化しなくても、IP アドレスが変わると、 Java のプログラムからそのサーバにアクセスできなくなることがあります。 具体的には、 AWS の ELB はホスト名が変わらずに IP アドレスだけ勝手に変化することがあるので、そのような場合に、名前解決に失敗します。 もちろんサーバ側の管理者が DNS の A レコードを変更したときにも発生するので、 AWS のみならず一般的に起き得ます。 どのようにキャッシュしている？ キャッシュを保持してある場所 InetAddress クラスがキャッシュを保持しています。 キャッシュが存在する限り、名前解決をしようとしても、キャッシュが参照されます。 キャッシュの有効期間を決定する場所 InetAddressCachePolicy クラスがキャッ
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