```javascript
import { AuthenticationDetails, CognitoUserPool, CognitoUser } from 'amazon-cognito-identity-js';

export default class CognitoUserPoolService{
    constructor(config){
        if (!config || !config.aws)
            throw new Error("aws configuration is missing.");
        if (!config.aws.cognitoUserPoolId)
            throw new Error("cognito userId is required.");
        if (!config.aws.clientId)
            throw new Error("App cliendId is required.");

        this.config = config;
    }

    signIn(username,password){
        if (!username)
            throw new Error("username is required.");
        if (!password)
            throw new Error("password is required.");

        var authenticationData = {
            Username : username,
            Password : password
        };
        var authenticationDetails = new AuthenticationDetails(authenticationData);

        var poolData = {
            UserPoolId : this.config.aws.cognitoUserPoolId,
            ClientId : this.config.aws.clientId
        };
        var userPool = new CognitoUserPool(poolData);
        var userData = {
            Username : username,
            Pool : userPool
        };
        var cognitoUser = new CognitoUser(userData);
        cognitoUser.authenticateUser(authenticationDetails, {
            onSuccess: function (result) {
                console.log('access token',result.getAccessToken().getJwtToken());
                console.log('id token',result.getIdToken().getJwtToken());
                console.log('refresh token',result.getRefreshToken().getJwtToken());
                AWSConfigHelper.configure(result.getIdToken().getJwtToken());
            },
            onFailure: function(err) {
                console.log(err.message || JSON.stringify(err));
            },

        });
    }
}
```