Function Compute:Metode kait siklus hidup instans

Kait Initializer

Implementasikan antarmuka FunctionInitializer dan metode initialize(Context context)-nya.

Definisi antarmuka:

package com.aliyun.fc.runtime;

import java.io.IOException;

/**
 * This is the interface for the initialization operation
 */
public interface FunctionInitializer {

    /**
     * The interface to handle a function compute initialize request
     *
     * @param context The function compute initialize environment context object.
     * @throws IOException IOException during I/O handling
     */
    void initialize(Context context) throws IOException;
}

Kait PreStop

Implementasikan antarmuka PreStopHandler dan metode preStop(Context context)-nya.

Definisi antarmuka:

package com.aliyun.fc.runtime;

import java.io.IOException;

/**
 * This is the interface for the preStop operation
 */
public interface PreStopHandler {

    /**
     * The interface to handle a function compute preStop request
     *
     * @param context The function compute preStop environment context object.
     * @throws IOException IOException during I/O handling
     */
    void preStop(Context context) throws IOException;
}

Contoh lengkap: StreamRequestHandler dengan kedua kait

package example;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.aliyun.fc.runtime.Context;
import com.aliyun.fc.runtime.StreamRequestHandler;
import com.aliyun.fc.runtime.FunctionInitializer;
import com.aliyun.fc.runtime.PreStopHandler;

public class App implements StreamRequestHandler, FunctionInitializer, PreStopHandler {
    @Override
    public void initialize(Context context) throws IOException {
        context.getLogger().info("initialize start ...");
    }

    @Override
    public void handleRequest(
            InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
        context.getLogger().info("handlerRequest ...");
        outputStream.write(new String("hello world\n").getBytes());
    }

    @Override
    public void preStop(Context context) throws IOException {
        context.getLogger().info("preStop start ...");
    }
}

Catatan: InputStream mengembalikan data dalam chunk. OutputStream tidak.

Gunakan Konsol Function Compute

Pada halaman detail fungsi di Konsol Function Compute, atur bidang kait menggunakan format [Nama paket].[Nama kelas]::[Nama metode].

Untuk kelas contoh di atas:

• Initializer Hook: example.App::initialize

• PreStop Hook: example.App::preStop

Gunakan Serverless Devs

Tambahkan instanceLifecycleConfig di bawah function dalam s.yaml, dengan sub-kunci initializer dan preStop. Setiap sub-kunci menerima handler dan timeout (dalam detik).

# ------------------------------------
#   Official manual: https://manual.serverless-devs.com/user-guide/aliyun/#fc3
#   Tips: https://manual.serverless-devs.com/user-guide/tips/
# If you have any questions, join the DingTalk group 33947367 for technical support.
# ------------------------------------
edition: 3.0.0
name: hello-world-app
access: "default"

vars: # The global variables
  region: "cn-hangzhou"

resources:
  hello_world:
    component: fc3
    actions:
      pre-${regex('deploy|local')}:
        - run: mvn package -DskipTests
          path: ./
    props:
      region: ${vars.region}
      functionName: "start-java-1xqf"
      description: 'hello world by serverless devs'
      runtime: "java8"
      code: ./target/HelloFCJava-1.0-SNAPSHOT-jar-with-dependencies.jar
      handler: example.App::handleRequest
      memorySize: 128
      timeout: 10
      instanceLifecycleConfig:      # The extension function
        initializer:                # The Initializer hook
          handler: example.App::initialize
          timeout: 60
        preStop:                    # The PreStop hook
          handler: example.App::preStop  # The function handler
          timeout: 60               # The timeout period.

Untuk referensi sintaksis YAML lengkap, lihat Perintah umum Serverless Devs.