PCF tile - Overview

What is a PCF tile: 

A tile is a software package that can be deployed in PCF ops manager for the app developers to consume, A tile can be anything - can be a PCF hosted tile such as MySQL service, Autoscaler service or it can be a custom tile (for a service that you created). 

What does a tile package contain. 

• Zip file (with .pivotal extension) containing bosh manifest and executables

When to create a tile:

• Create and provision services for your system. 
• Integrate a third party functionality - database, message broker etc., 

Tile generator: tool to create a tile. 

• Input: 
• Service, service broker, build pack, docker image etc., 
• Output:
• .pivotal file
• Contains
• Deployment scripts
• Bosh release
• Tile
• Concourse CI
• How to 
• Tile init: 
• Creates a shell. 
• Tile build
• Creates bosh release. 
• Tile.yml
• Create forms for customization. 

# Importing a tile into PCF ops manager

• Import a pivotal file into the ops manager. 
• Add the tile
• Specify settings:
• Availability zones, 
• Form values that are specified in the tile.yml

And now you can use the tile. 

Spring scheduler - refresh

Schedulers are ways by which schedule a job to run at a predefined interval. 

Steps to implement scheduler

1. Include @EnableScheduling in the Main configuration file. 

@SpringBootApplication

@EnableScheduling

public class BasicsApplication 

1. Annotate with @Scheduled, specifying the criteria fixedRate. 

@Scheduled(fixedRate=5000)

public void displayScheduledTime() {

    System.out.println("The time is: " + dateFormat.format(new Date()));

    log.info("The time now is {} ", dateFormat.format(new Date()));

}

What else can you do using Spring schedulers. 

@Scheduled(fixedRate = 5000) 

• Runs the job every 5 seconds by comparing with the start. 

@Scheduled(fixedDelay = 5000)

• Runs the job by verifying with the delay instead of the start time. 

@Scheduled(initialDelay=10000, fixedRate = 500)

• Waits for 10 seconds and then executes the method every 500 ms. 

@Scheduled(cron="*/5 * * * * MON-FRI")

• Runs a scheduled cron job. 

@Async is a annotation which is used to indicate a method that it should be executed asynchronously.