Some days ago, I presented how the code got much cleaner when I replaced Mongoose callbacks with the async-await feature from ES7, which NodeJs already support. I mentioned then, I was gonna do a post to demonstrate how async-await can also be used to make parallel calls. Here am I doing just that. I was actually blown away by its simplicity and performance gain when doing so. Let me show you what I mean.

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Jax-RS REST Client example demonstrating how to GET a resource with a query parameter. The resource is secured with Basic Authentication.

A lot has been written already about the transition from callbacks to promises and now to the new async/await1 feature in ES7.

"The purpose of `async/await` functions is to simplify the behavior of using promises synchronously and to perform some behavior on a group of `Promises`. Just as `Promises` are similar to structured callbacks, `async/await is similar to combining generators and promises."[^1]

In this blog post I present what this code “upgrade” meant for CRUD operations performed on codingmarks. I use Moongoose in an ExpressJS/NodeJS backend to perform the operations against a MongoDB database.

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This post presents the snippet from the Nginx configuration that redirects all request to https://www.codingmarks.org:

# redirect HTTP to www
server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name codingmarks.org www.codingmarks.org;

    return 301 https://www.codingmarks.org$request_uri;
}

# redirect HTTPS to wwww
server {
    listen 443;
    server_name codingmarks.org;

    return 301 https://www.codingmarks.org$request_uri;
}

Note the missing www.codingmarks.org in the second server/server_name entry, to avoid an infinite loop

Lots of other good Nginx resources can be found if you search for the nginx tag on codingmarks: https://www.codingmarks.org?q=[nginx]

Octocat Source code for codingmarks.org is available on Github - frontend and backend.

This blog post presents a simple example showing how to insert a document in mongodb, in the Java language.

Octocat The code samples are taken from the Free-Programming-Books-Importer project, available on Github

Use MongoDB Java Driver

Add the java mongo driver to your class path, or if you use maven to the dependencies in your pom file:

<dependencies>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongodb-driver</artifactId>
        <version>3.2.2</version>
    </dependency>
    ......
</dependencies>

Prepare the Mongo Client

MongoClientURI connectionString = new MongoClientURI("mongodb://codingpedia:codingpedia@localhost:27017/codingpedia-bookmarks");
MongoClient mongoClient = new MongoClient(connectionString);
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