Design E-commerce Spring Boot App with JMS with Caching and pub-sub mechanism

Requirement: A number of vendors provide price information for traded instruments; a traded instrument will have different prices from different vendors. Price data from each vendor is to be cached in a local data store and then distributed to interested downstream systems. The cache will have services to allow clients to publish and retrieve data from the store. Clients are interested in getting all prices from a particular vendor or prices for a single instrument from various vendors. Prices older than 30 days must be removed from the cache. The task is to design and implement such service. Your solution must include the following: 1. document the design using sequencing diagrams, explaining choices made to arrive at the solution 2. document the domain model for persisted objects using appropriate diagrams 3. document the implementation explaining any design patterns – simple in-memory maps can be used to persist the objects, although this should be easy to change to allow a different persistence implementation i.e. database. 4. all implemented classes must be unit tested 5. document any problems encountered and how they were overcome 6. optional: provide a demo for implemented rest API Permitted Technologies: The following technologies can be used wherever appropriate. Java – versions 1.7+ Spring – including Spring boot, Spring integration, Spring Web. Other DI frameworks can also be used JMS – embedded brokers are allowed JDBC/Caching – any permitted, including embedded solutions Testing frameworks – JUnit/JMock/Mockito etc. Maven/Gradle