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Groovy & Gradle: JVM Automation and Build Engineering · 课时

构建缓存与守护进程

利用 Gradle 构建缓存和守护进程，大幅加快增量构建速度。

构建缓存与守护进程 是 CoddyKit 上的免费 Groovy & Gradle: JVM Automation and Build Engineering 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Groovy & Gradle: JVM Automation and Build Engineering 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Groovy & Gradle: JVM Automation and Build Engineering 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Boost Your Gradle Builds

Ever waited too long for a Gradle build to finish? In this lesson, we'll unlock two powerful features to speed up your development:

  • Gradle Daemon: Keeps a JVM running in the background.
  • Build Cache: Reuses outputs from previous builds.

These tools are essential for making your incremental builds much faster!

Meet the Gradle Daemon

The Gradle Daemon is a long-lived background process that hosts your Gradle builds. Think of it like a dedicated server for your builds!

  • It eliminates the JVM startup overhead for each build.
  • It keeps project information and caches in memory.
  • This means subsequent builds are significantly faster!

Daemon in Action: First Run

Let's see the Daemon's effect. The first time you run a Gradle command, the Daemon might need to start up, taking a bit longer. Copy this into a build.gradle file:

task greet {
  doLast {
    println "Hello from Gradle!"
  }
}

Daemon in Action: Subsequent Runs

Now, run the task again using gradle greet. Notice how much faster it is? That's the Daemon at work!

You can check if the Daemon is running with gradle --status and stop it with gradle --stop.

Understanding the Build Cache

The Gradle Build Cache stores the outputs of tasks that have been executed. If a task's inputs haven't changed, Gradle can reuse its cached output instead of re-running it.

  • It saves time by avoiding redundant work.
  • Works across different machines if a remote cache is configured.
  • Enabled by default for local caching.

Local Build Cache Explained

The local build cache is stored on your machine, typically in your Gradle user home directory (~/.gradle/caches/build-cache).

When a task runs, Gradle calculates a hash of its inputs. If that hash matches an entry in the cache, the cached output is used. If not, the task runs and its output is stored.

Cacheable Tasks

For a task to be cacheable, it must properly declare its inputs and outputs. Gradle needs to know what goes into a task and what comes out to determine if it can be cached.

  • Inputs: Files, properties, directories used by the task.
  • Outputs: Files or directories produced by the task.

Many built-in Gradle tasks (like compileJava) are cacheable by default!

Build Cache in Practice

Let's create a task that generates a file. Run gradle generateReport once, then run it again. Notice FROM-CACHE or UP-TO-DATE in the output!

task generateReport {
  inputs.property 'version', '1.0'
  outputs.file 'build/report.txt'
  doLast {
    def reportFile = file('build/report.txt')
    reportFile.parentFile.mkdirs()
    reportFile.text = "Report Version: ${inputs.properties.version}"
    println "Generated report.txt"
  }
}

When Cache Isn't Used

Sometimes, the build cache might not be used, leading to a "cache miss". Common reasons include:

  • Input Changes: Any change to task inputs (even a timestamp).
  • Task Not Cacheable: Task doesn't properly declare inputs/outputs.
  • Cache Disabled: Explicitly disabled with --no-build-cache.
  • Local Cache Cleaned: Cache entries removed.

Quick Check: Build Speed

What is the primary benefit of the Gradle Daemon?

Recap: Faster Builds Ahead!

You've learned how the Gradle Daemon and Build Cache significantly improve build performance:

  • The Daemon keeps a JVM running, making subsequent builds start faster.
  • The Build Cache reuses previous task outputs, avoiding redundant work.

By leveraging these, you can enjoy much quicker incremental builds and a smoother development workflow. Next, we'll explore profiling and debugging your builds!

常见问题解答

「构建缓存与守护进程」课时是免费的吗？

是的 — 「构建缓存与守护进程」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Groovy & Gradle: JVM Automation and Build Engineering 课程的其余内容，请升级到 CoddyKit PRO。 Groovy & Gradle: JVM Automation and Build Engineering 课程共包含 4 节课。

「构建缓存与守护进程」这节课中我会学到什么？

利用 Gradle 构建缓存和守护进程，大幅加快增量构建速度。 你通过在浏览器中直接运行的动手代码来练习 Groovy & Gradle: JVM Automation and Build Engineering，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Groovy & Gradle: JVM Automation and Build Engineering 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Groovy & Gradle: JVM Automation and Build Engineering 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。

「构建缓存与守护进程」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Groovy & Gradle: JVM Automation and Build Engineering 课中编写并运行代码吗？

能。每节 Groovy & Gradle: JVM Automation and Build Engineering 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

  1. 构建缓存与守护进程
  2. 构建性能分析与调试
  3. 并行执行与配置
  4. 增量构建与任务输入/输出
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