22 lines
1.4 KiB
Markdown
22 lines
1.4 KiB
Markdown
Spring Cloud Function Deployer is an library for building apps that can deploy functions packaged as jars. It can deploy a basic Spring Cloud Function app from a jar with locally cached dependencies in about 500ms (compared to 1500ms for the same application launched from cold). It can be used in a pool as a "warm" JVM to deploy functions quicker than they could be started from scratch. Example usage:
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```java
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@SpringBootApplication
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@EnableFunctionDeployer
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public class FunctionApplication {
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public static void main(String[] args) throws IOException {
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new ApplicationBootstrap().run(FunctionApplication.class, args);
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}
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}
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```
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There is a main class in the jar that alread looks like this. You can use it like that or you can create your own copy if you want to customize it. The `ApplicationBootstrap` is a utility that replaces `SpringApplication`, creating a class loader hierarchy that works with the function configuration. It needs to be launched with configuration for the `FunctionProperties`:
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| Option | Description |
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|--------|----------------------|
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| `function.location` | Mandatory archive location(s) for building the classpath of the function. |
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| `function.bean` | Mandatory bean class or name (if `function.main` is provided) to create the function. If multi-valued, the function is composed (outputs piped to inputs) |
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| `function.main` | The main `@SpringBootApplication` to launch (optional). |
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