CODEWITHSUNDEEP
amazon-web-servicesamazon-s3aws-lambdaamazon-cloudwatch-events
nats
nats

Reputation: 197

lambda handler for multiple triggers in aws lambda

How will the Lambda handler of multiple different types of trigger look like in java? I want to set a trigger for Cloudwatch Event Rule, S3. How can I do this?

public class App implements RequestHandler<S3Event, Context>
{
public Context handleRequest(S3Event s3event, Context context) {
     System.out.println("welcome to lambda");
    }
}

Upvotes: 1

Views: 2803

Answers (2)

k1r0
k1r0

Reputation: 552

You can use Map<String,String> as input

public class Handler implements RequestHandler<Map<String,String>, String>{
  @Override
  public String handleRequest(Map<String,String> event, Context context) {
  }
}

Or use RequestStreamHandler and parse the InputStream to the correct object.

public class HandlerStream implements RequestStreamHandler {
  @Override
  public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
  }
}

Upvotes: 2

oieduardorabelo
oieduardorabelo

Reputation: 2985

using a generic Object could work, I use Serverless Framework with:

package com.serverless;

import java.util.Collections;
import java.util.Map;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

public class Handler implements RequestHandler<Object, Object> {

    private static final Logger LOG = LogManager.getLogger(Handler.class);

    @Override
    public Object handleRequest(final Object input, final Context context) {
        LOG.info("received: {}", input);
        return input;
    }
}

Upvotes: 0

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