Add pattern: Timer and TimerTask → ScheduledExecutorService

[Copilot]

Adds the "Timer tasks to scheduled executors" concurrency pattern, showing the migration from Timer/TimerTask to ScheduledExecutorService.

Content

• New pattern file content/concurrency/timer-task-to-scheduled-executor.yaml (difficulty: intermediate, JDK 5+)
• Spliced into the concurrency navigation chain between lock-free-lazy-init and io/http-client, updating prev/next on both neighbors

Proof

• proof/concurrency/TimerTaskToScheduledExecutor.java demonstrates the modern code compiles and runs on JDK 25

Translations

• Partial content translations added for all 13 non-English locales (de, es, pt-BR, zh-CN, ar, fr, ja, ko, bn, it, pl, tr, ru)

Social

• Appended queue/tweet draft entries via the social queue generator (social/queue.txt, social/tweets.yaml)

// Old
Timer timer = new Timer("refresh-timer");
timer.scheduleAtFixedRate(new TimerTask() {
    @Override public void run() { refresh(); }
}, 0, 60_000);

// Modern
ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedRate(this::refresh, 0, 1, TimeUnit.MINUTES);

• Fixes [Pattern] Timer tasks to scheduled executors #208

[Copilot]

Pull request overview

Adds the Timer/TimerTask migration pattern to the concurrency catalog.

Changes:

• Adds pattern content and proof script.
• Updates navigation and social publishing artifacts.
• Adds translations for all 13 non-English locales.

Show a summary per file

File	Description
content/concurrency/timer-task-to-scheduled-executor.yaml	Defines the new pattern.
content/concurrency/lock-free-lazy-init.yaml	Links forward to the pattern.
content/io/http-client.yaml	Links back to the pattern.
proof/concurrency/TimerTaskToScheduledExecutor.java	Provides the compilation proof.
social/queue.txt	Queues the pattern for publishing.
social/tweets.yaml	Adds its social draft.
translations/content/ar/concurrency/timer-task-to-scheduled-executor.yaml	Adds Arabic content.
translations/content/bn/concurrency/timer-task-to-scheduled-executor.yaml	Adds Bengali content.
translations/content/de/concurrency/timer-task-to-scheduled-executor.yaml	Adds German content.
translations/content/es/concurrency/timer-task-to-scheduled-executor.yaml	Adds Spanish content.
translations/content/fr/concurrency/timer-task-to-scheduled-executor.yaml	Adds French content.
translations/content/it/concurrency/timer-task-to-scheduled-executor.yaml	Adds Italian content.
translations/content/ja/concurrency/timer-task-to-scheduled-executor.yaml	Adds Japanese content.
translations/content/ko/concurrency/timer-task-to-scheduled-executor.yaml	Adds Korean content.
translations/content/pl/concurrency/timer-task-to-scheduled-executor.yaml	Adds Polish content.
translations/content/pt-BR/concurrency/timer-task-to-scheduled-executor.yaml	Adds Brazilian Portuguese content.
translations/content/ru/concurrency/timer-task-to-scheduled-executor.yaml	Adds Russian content.
translations/content/tr/concurrency/timer-task-to-scheduled-executor.yaml	Adds Turkish content.
translations/content/zh-CN/concurrency/timer-task-to-scheduled-executor.yaml	Adds Simplified Chinese content.

Review details

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

• Files reviewed: 19/19 changed files
• Comments generated: 1
• Review effort level: Balanced