flashcache

Class Quote

java.lang.Object

flashcache.Quote

public class Quote
extends Object

This class is an interactive command-line application that looks up NASDAQ stock symbols and displays current quote information. A cache loader, QuoteLoader, is used to read quotes from quotes.nasdaq.com and cache them in the distributed GemFire cache for quicker access.

Quotes are cached for 20 seconds. At that time the cached data is invalidated by GemFire and, if the symbol is queried again, the QuoteLoader will be invoked to read an updated quote from NASDAQ.

The program is run like this, assuming that you have followed the instructions for setting up your environment.

 $ java flashcache.Quote 
 Enter symbol: ORCL
 (QuoteLoader netSearching for ORCL)
 (QuoteLoader querying nasdaq for ORCL)
 ORCL: last sale=9.85  net change=-0.34  volume=26,526,419
 Enter next symbol: AMZN
 (QuoteLoader netSearching for AMZN)
 (QuoteLoader querying nasdaq for AMZN)
 AMZN: last sale=36.37  net change=-0.19  volume=5,668,938
 Enter next symbol: 

 

The main prompts for a NASDAQ stock symbol. Enter a symbol, such as SUNW, to request a quote. Enter no symbol to exit. The cached quotes are distributed to other GemFire caches connected to the same distributed system. Optimistic distribution is used, so there is no locking or acknowledgment of updates, and quotes are distributed asynchronously.

Since:

2.0

Constructor Summary

Constructors

Constructor and Description
Quote()

Method Summary

Methods

Modifier and Type	Method and Description
String	getQuote(String symbol) this method returns a cached quote
void	initializeCache(com.gemstone.gemfire.cache.Cache cache, com.gemstone.gemfire.cache.CacheListener<String,Object> aListener) this method initializes the cache
void	initializeDistSystem(String sysDir) this method initializes the distributed system
static void	main(String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Quote

public Quote()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

getQuote

public String getQuote(String symbol)
                throws Exception

this method returns a cached quote

Throws:

Exception

initializeDistSystem

public void initializeDistSystem(String sysDir)
                          throws Exception

this method initializes the distributed system

Throws:

Exception

initializeCache

public void initializeCache(com.gemstone.gemfire.cache.Cache cache,
                   com.gemstone.gemfire.cache.CacheListener<String,Object> aListener)
                     throws Exception

this method initializes the cache

Throws:

Exception