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Low Level Design (LLD) Coding

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Low Level Design (LLD) Coding

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Design (LLD) content delivery network - Machine Coding

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techlinks.in
·Dec 31, 2022·

3 min read

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A low-level design (LLD) for a content delivery network (CDN) might include the following components:

  1. Edge servers: The edge servers are responsible for storing and serving the content to the users. They are distributed geographically to provide low latency and high availability.

  2. Origin server: The origin server is the source of the content, and it is responsible for storing and serving the content to the edge servers.

  3. DNS server: The domain name system (DNS) server is responsible for mapping domain names to IP addresses, allowing users to access the content using friendly URLs.

  4. Load balancer: The load balancer is responsible for distributing the traffic among the edge servers to ensure that they are utilized efficiently and do not become overloaded.

  5. Monitoring and management: The monitoring and management component is responsible for monitoring the performance and availability of the CDN, and for managing the configuration and deployment of the edge servers.

This is just a basic outline of the components that might be included in a low-level design of a CDN. The specific details and implementation of these components will depend on the specific requirements and use case of the CDN.

Here is a low-level design of a content delivery network (CDN) in Java:

public class ContentDeliveryNetwork {
    private List<EdgeServer> edgeServers;
    private OriginServer originServer;
    private DNSServer dnsServer;
    private LoadBalancer loadBalancer;
    private MonitoringAndManagement monitoringAndManagement;

    public ContentDeliveryNetwork() {
        this.edgeServers = new ArrayList<>();
        this.originServer = new OriginServer();
        this.dnsServer = new DNSServer();
        this.loadBalancer = new LoadBalancer(edgeServers);
        this.monitoringAndManagement = new MonitoringAndManagement(edgeServers, loadBalancer);
    }

    public void serveContent(String url) {
        String content = originServer.getContent(url);
        EdgeServer selectedEdgeServer = loadBalancer.selectServer();
        selectedEdgeServer.storeContent(url, content);
        String ipAddress = dnsServer.getIPAddress(url);
        selectedEdgeServer.serveContent(ipAddress, url);
    }
}
public class EdgeServer {
    private Map<String, String> storedContent;

    public EdgeServer() {
        this.storedContent = new HashMap<>();
    }

    public void storeContent(String url, String content) {
        storedContent.put(url, content);
    }

    public void serveContent(String ipAddress, String url) {
        String content = storedContent.get(url);
        // serve the content to the user at the specified IP address
    }
}
public class OriginServer {
    public String getContent(String url) {
        // retrieve the content from the origin server
    }
}
public class DNSServer {
    private Map<String, String> domainMappings;

    public DNSServer() {
        this.domainMappings = new HashMap<>();
    }

    public String getIPAddress(String url) {
        return domainMappings.get(url);
    }
}
public class LoadBalancer {
    private List<EdgeServer> edgeServers;

    public LoadBalancer(List<EdgeServer> edgeServers) {
        this.edgeServers = edgeServers;
    }

    public EdgeServer selectServer() {
        // use a load balancing algorithm to select an edge server
    }
}
public class MonitoringAndManagement {
    private List<EdgeServer> edgeServers;
    private LoadBalancer loadBalancer;

    public MonitoringAndManagement(List<EdgeServer> edgeServers, LoadBalancer loadBalancer) {
        this.edgeServers = edgeServers;
        this.loadBalancer = loadBalancer;
    }

    public void monitorPerformance() {
        // monitor the performance of the edge servers and the load balancer
    }

    public void deployEdgeServer(String location) {
        EdgeServer edgeServer = new EdgeServer();
        edgeServers.add(edgeServer);
        loadBalancer.updateServers(edgeServers);
    }
}

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