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1.6. Red Hat JBoss Data Grid Cache Architecture

Red Hat JBoss Data Grid Cache Architecture Diagram
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Red Hat JBoss Data Grid Cache Architecture Diagram

Figure 1.1. Red Hat JBoss Data Grid Cache Architecture

Red Hat JBoss Data Grid's cache infrastructure depicts the individual elements and their interaction with each other in each JBoss Data Grid Usage Mode (Library and Remote Client-Server). For clarity, each cache architecture diagram is separated into two parts:
  • Elements that a user cannot directly interact with are depicted within a dark grey box in the diagram. In Remote Client-Server mode, this includes Persistent Store, Cache, Cache Manager, L1 Cache, and Server Module. In Library mode, user cannot directly interact with Persistent Store and L1 Cache.
  • Elements that a user can interact directly with are depicted in a light grey box in the diagram. In Remote Client-Server mode, this includes the Application and the Cache Client. In Library mode, users are allowed to interact with the Cache and Cache Manager, as well as the Application.
Cache Architecture Elements

JBoss Data Grid's cache architecture includes the following elements:

  1. The Persistent Store is an optional component. It can permanently store the cached entries for restoration after a data grid shutdown.
  2. The Level 1 Cache (or L1 Cache) stores remote cache entries after they are initially accessed, preventing unnecessary remote fetch operations for each subsequent use of the same entries.
  3. The Cache Manager controls the life cycle of Cache instances and can store and retrieve them when required.
  4. The Cache is the main component for storage and retrieval of the key-value entries.
Library and Remote Client-Server Mode Architecture

In Library mode, the Application (user code) can interact with the Cache and Cache Manager components directly. In this case the Application resides in the same Java Virtual Machine (JVM) and can call Cache and Cache Manager Java API methods directly.

In Remote Client-Server mode, the Application does not directly interact with the cache. Additionally, the Application usually resides in a different JVM, on different physical host, or does not need to be a Java Application. In this case, the Application uses a Cache Client that communicates with a remote JBoss Data Grid Server over the network using one of the supported protocols such as Memcached, Hot Rod, or REST. The appropriate server module handles the communication on the server side. When a request is sent to the server remotely, it translates the protocol back to the concrete operations performed on the cache component to store and retrieve data.
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