Course Summary
About CHPS
- Early 2000’s - NWS began looking for a SOA/COTS approach to replace NWSRFS.
- 2005 - NWS selected Deltares to facilitate the transition.
- 2007 - A CHPS prototype was demonstrated in April. By December, the software was being used at the first wave of offices, called CAT-I RFCs.
- 2009 - CAT-I offices began migrating to CHPS.
- Early 2012 - All RFCs were migrated to CHPS.
- Focal point roles include, but are not limited to:
- Configuration Focal Point: Manages and creates configuration files in CHPS.
- System Manager: Oversees the system performance and overall administration.
- Simulation Focal Point: Supervises simulations and maintains files and software.
- Data Focal Point: Administers the data flow and creation of new data.
Hardware
- The MC delegates tasks, relays messages, and monitors the system.
- The database server hosts the Central Database.
- The FSSs execute tasks and model runs and have MC Proxy, a scaled down version of the Master Controller.
- The Operator Client (OC) is the live system and the Stand Alone (SA) is the test bed version of CHPS.
| Servers | Purpose |
|---|---|
| RP1 | Forecast operations |
| RP2 | Backup system, testbed for patches and builds |
| RP3 | Hydrologic development projects, testbed for patches and builds |
Software
Java Software
- JBoss, the application server, provides the infrastructure for the Java Messaging System (JMS), the service used to transfer information from JBoss (CHPS1) to the Master Controller.
- JDBC driver allows the Java programs to access the database management system. The Java Runtime Environment (JRE) executes all of the Java programs.
- MCProxy accepts task requests from the MC, starts the FSS to honor the request, and responds to queries about the status of the FSSs.
- Apache Tomcat builds the Administration Interface.
CHPS Interfaces
- Interactive Forecast Display (IFD) - the forecasting interface for CHPS.
- Workflow Navigator - shows registered workflows and processing steps for the forecast area.
- Database Viewer - displays the time series stored in the database.
- System Monitor - displays the status of the system.
CHPS Tools
- Configuration Manager (CM) - allows the user to upload configurations to the Central Database.
- Administration Interface (AI or Admin Interface) - a web-based monitor for the health of the CHPS system.
- DbVisualizer - a database query application.
CHPS Processes
- Rolling Barrel - makes a new data store copy, deletes the old data store, and moves the newly created temporary data store to its place.
- Amalgamate - a task that takes multiple small pieces of data and combines it into one single record and therefore one single entry in the database.
- MarkedRecordManager - deletes records scheduled to be deleted (but only if they are scheduled).
- Synchronization - copies (synchronizes) the data to the MCs. This task prevents creating the information two or three times between the server clusters.
File Structure
- Configuration files for components only found on a single, virtual server are only located on that server.
- Files used across multiple servers are connected through a mounted drive called CHPS Share (chps_share).
- The CHPS base configuration directory contains several important subdirectories, including ColdStates, Config, Help, Icons, localDataStore, Map, and Models.
XML Advantages
- Programmers can create their own tags.
- Widely used, so exchanging information with other agencies and academia is easier.
- No cost to use XML, and there are many free XML authoring tools.
- Code is "human-legible" and reasonably clear.
- Platform and software independent and most browsers and text editors support it.
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