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package examples;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.BufferedReader;

import java.io.Writer;

import java.util.Random;

import com.amazonaws.services.lambda.runtime.RequestStreamHandler;

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

import org.json.simple.JSONObject;

import org.json.simple.JSONArray;

import org.json.simple.parser.ParseException;

import org.json.simple.parser.JSONParser;

import com.stackimpact.agent.StackImpact;

import com.stackimpact.agent.ProfileSpan;

public class Hello implements RequestStreamHandler {

JSONParser parser = new JSONParser();

// initialize StackImpact agent

static {

StackImpact.setAutoProfilingMode(false);

StackImpact.start("agent key here", "LambdaJavaApp");

}

public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {

ProfileSpan span = StackImpact.profile();

// simulate CPU work

try {

Random rand = new Random();

for (int i = 0; i < 20 * 1000000; i++) {

rand.nextInt(100000);

}

catch(Exception ex) {

}

// end CPU work

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

JSONObject responseJson = new JSONObject();

String responseCode = "200";

try {

JSONObject event = (JSONObject)parser.parse(reader);

JSONObject responseBody = new JSONObject();

responseBody.put("input", event.toJSONString());

responseBody.put("message", "Hello");

JSONObject headerJson = new JSONObject();

headerJson.put("x-custom-header", "my custom header value");

responseJson.put("isBase64Encoded", false);

responseJson.put("statusCode", responseCode);

responseJson.put("headers", headerJson);

responseJson.put("body", responseBody.toString());

} catch(ParseException pex) {

responseJson.put("statusCode", "400");

responseJson.put("exception", pex);

}

OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");

writer.write(responseJson.toJSONString());

writer.close();

span.stop();

}

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