Monitor the Stock Price"

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{{ZKSpreadsheetEssentialsPageHeader}}
 
{{ZKSpreadsheetEssentialsPageHeader}}
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{{Deprecated|url=http://books.zkoss.org/wiki/ZK_Spreadsheet_Essentials}}
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__TOC__
 
__TOC__
  
Here is a ''Stock Price'' monitoring system that uses the ZK Spreadsheet's onCellChange event and data push mechanism.
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Here is a ''Stock Price'' monitoring system that uses the ZK Spreadsheet's onCellChange event and Book sharing mechanism<ref>{{ZSS EE}}</ref>.
 +
<references/>
  
==Purpose==
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===Purpose===
 
Automatically place ''buy'' or ''sell'' command whenever the price of a selected stock reach some preset point.
 
Automatically place ''buy'' or ''sell'' command whenever the price of a selected stock reach some preset point.
  
==Template Excel File with Proper Name Expressions==
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===Template Excel File with Proper Name Expressions===
 
Here is an Excel template file with monitorSheet and dataSheet. monitorSheet shows the selected stocks that refer to the dataSheet with formulas. dataSheet is a sheet that list all available stocks.
 
Here is an Excel template file with monitorSheet and dataSheet. monitorSheet shows the selected stocks that refer to the dataSheet with formulas. dataSheet is a sheet that list all available stocks.
  
[[Image:stock-template.png]]
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<code>''monitorSheet''</code>
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 +
[[Image:stock-monitor.png]]
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<code>''dataSheet''</code>
  
==How ZK Spreadsheet Do the Job==
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[[Image:stock-data.png]]
Assume a stock price service will keep on pumping in updated stock price into  the dataSheet on a separate thread. Whenever a new price is updated into dataSheet, ZK Spreadsheet will trigger the cell change event on monitorSheet that refer to the dataSheet. The onCellChange event listener registered on the ZK Spreadsheet will be called and check the prices . It compairs new price with preset selling price and buying price then notify buying or selling via another Web service.
+
 
 +
===How ZK Spreadsheet Do the Job===
 +
Assume a stock price service will keep on pumping in updated stock price into  the dataSheet on a separate thread. Whenever a new price is updated into dataSheet, ZK Spreadsheet will trigger the cell change event on monitorSheet that refer to the dataSheet. The onCellChange event listener registered on the ZK Spreadsheet will be called and check the prices . It compairs new price with user preset selling and buying price then trigger buying or selling via another Web service.
  
 
[[Image:stock-event.png]]
 
[[Image:stock-event.png]]
  
===ZUML Example===
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===ZUML===
<source lang="xml" high="5">
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<source lang="xml">
<spreadsheet apply="demo.stock.StockComposer"
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<window apply="org.zkoss.zssessentials.cellaction.StockComposer" width="100%" vflex="1">
src="/stock.xls"
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<spreadsheet id="stock"
maxrows="200"  
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    maxrows="200"
maxcolumns="40"  
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    maxcolumns="40"
vflex="1"  
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    vflex="1"
width="100%">
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    width="100%">
</spreadsheet>
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</spreadsheet>
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<vlayout id="message" height="200px" width="100%" style="overflow:auto">
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</vlayout>
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</window>
 
</source>
 
</source>
  
===Stock Composer===
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===Composer===
This is the controller that handle the onCellChange event.
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This is the controller that handle the onCellChange event. The key method is the onCellChange$stocck() event listener. Whenever an onCellChange event is triggered, this method will be called and pass through with a CellEvent event. The event listener then compare if the cell changed is in the price column range and check if the price achieve buy or sell price setting by end user.
<source lang="java" high="17">
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<source lang="java" highlight="18,20,32,46,56,58">
package demo.stock;
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package org.zkoss.zssessentials.cellaction;
 
public class StockComposer extends GenericForwardComposer {
 
public class StockComposer extends GenericForwardComposer {
 
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private static Book book = null;
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private static StockUpdateService service;
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private Vlayout message;
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private Spreadsheet stock;
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private Worksheet monitorSheet;
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private int left;
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private int top;
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private int right;
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private int bottom;
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public void doAfterCompose(Component comp) throws Exception {
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super.doAfterCompose(comp);
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synchronized (StockComposer.class) {
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if (book == null) { //initialize the shared Book and Stock update service
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final Importer importer = Importers.getImporter("excel");
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final InputStream is = Sessions.getCurrent().getWebApp().getResourceAsStream("/WEB-INF/excel/cellaction/stock.xls");
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book = importer.imports(is, "stock.xls");
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book.setShareScope(EventQueues.APPLICATION); //share the work book in Application Scope
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service = new StockUpdateService(book);
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}
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}
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stock.setBook(book);
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monitorSheet = stock.getSelectedSheet();
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final Range priceRange = Ranges.range(monitorSheet, "price");
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left = priceRange.getColumn();
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top = priceRange.getRow();
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right = priceRange.getLastColumn();
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bottom = priceRange.getLastRow();
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}
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public void onCellChange$stock(CellSelectionEvent event) {
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final Worksheet sheet = event.getSheet();
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if (!monitorSheet.equals(sheet)) {
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return; //not the monitorSheet, return
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}
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final int eleft = event.getLeft();
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final int etop = event.getTop();
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final int eright = event.getRight();
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final int ebottom = event.getBottom();
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if (left > eright || eleft > right || top > ebottom || etop > bottom) {
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return; //no intersection, return
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}
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for (int row = etop; row <= ebottom; ++row) {
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for (int col = eleft; col <= eright; ++col) {
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if (left <= col && col <= right && top <= row && row <= bottom) { //in range
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final Range priceRng = Ranges.range(monitorSheet, row, col);
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final Range sellRng = priceRng.getOffset(0, 3);
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final Range buyRng = priceRng.getOffset(0, 2);
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final Range codeRng = priceRng.getOffset(0, -1);
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final double newPrice = ((Number)priceRng.getValue()).doubleValue();
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final double sellPrice = ((Number)sellRng.getValue()).doubleValue();
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final double buyPrice = ((Number)buyRng.getValue()).doubleValue();
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final String stockCode = (String) codeRng.getValue();
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if (newPrice <= buyPrice) {
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buy(stockCode, priceRng);
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} else if (newPrice >= sellPrice) {
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sell(stockCode, priceRng);
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}
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}
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}
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}
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}
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private void buy(String stockCode, Range priceRng) {
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//stockService.buy(stockCode, price);
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new Label("Buy "+stockCode+" at price: "+priceRng.getText()).setParent(message);
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}
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private void sell(String stockCode, Range priceRng) {
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new Label("Sell "+stockCode+" at price: "+priceRng.getText()).setParent(message);
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}
 
}
 
}
 
</source>
 
</source>
  
==Result==
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===Result===
  
 
[[Image:stock-result.png]]
 
[[Image:stock-result.png]]
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 +
View complete source of ZUML [http://code.google.com/p/zkbooks/source/browse/trunk/zssessentials/examples/WebContent/cellaction/stock.zul stock.zul]
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 +
View complete source of composer [http://code.google.com/p/zkbooks/source/browse/trunk/zssessentials/examples/src/org/zkoss/zssessentials/cellaction/StockComposer.java StockComposer.java]
  
 
=Version History=
 
=Version History=

Latest revision as of 12:57, 19 January 2022



Stop.png This article is out of date, please refer to http://books.zkoss.org/wiki/ZK_Spreadsheet_Essentials for more up to date information.


Here is a Stock Price monitoring system that uses the ZK Spreadsheet's onCellChange event and Book sharing mechanism[1].

Purpose

Automatically place buy or sell command whenever the price of a selected stock reach some preset point.

Template Excel File with Proper Name Expressions

Here is an Excel template file with monitorSheet and dataSheet. monitorSheet shows the selected stocks that refer to the dataSheet with formulas. dataSheet is a sheet that list all available stocks.

monitorSheet

Stock-monitor.png

dataSheet

Stock-data.png

How ZK Spreadsheet Do the Job

Assume a stock price service will keep on pumping in updated stock price into the dataSheet on a separate thread. Whenever a new price is updated into dataSheet, ZK Spreadsheet will trigger the cell change event on monitorSheet that refer to the dataSheet. The onCellChange event listener registered on the ZK Spreadsheet will be called and check the prices . It compairs new price with user preset selling and buying price then trigger buying or selling via another Web service.

Stock-event.png

ZUML

<window apply="org.zkoss.zssessentials.cellaction.StockComposer" width="100%" vflex="1">
	<spreadsheet id="stock"
	    maxrows="200"
	    maxcolumns="40"
	    vflex="1"
	    width="100%">
	</spreadsheet>
	<vlayout id="message" height="200px" width="100%" style="overflow:auto">
	</vlayout>
</window>

Composer

This is the controller that handle the onCellChange event. The key method is the onCellChange$stocck() event listener. Whenever an onCellChange event is triggered, this method will be called and pass through with a CellEvent event. The event listener then compare if the cell changed is in the price column range and check if the price achieve buy or sell price setting by end user.

package org.zkoss.zssessentials.cellaction;
public class StockComposer extends GenericForwardComposer {
	private static Book book = null;
	private static StockUpdateService service;
	private Vlayout message;
	private Spreadsheet stock;
	private Worksheet monitorSheet;
	private int left;
	private int top;
	private int right;
	private int bottom;
	
	public void doAfterCompose(Component comp) throws Exception {
		super.doAfterCompose(comp);
		synchronized (StockComposer.class) {
			if (book == null) { //initialize the shared Book and Stock update service
				final Importer importer = Importers.getImporter("excel");
				final InputStream is = Sessions.getCurrent().getWebApp().getResourceAsStream("/WEB-INF/excel/cellaction/stock.xls");
				book = importer.imports(is, "stock.xls");
				book.setShareScope(EventQueues.APPLICATION); //share the work book in Application Scope
				service = new StockUpdateService(book);
			}
		}
		stock.setBook(book);
		monitorSheet = stock.getSelectedSheet();
		final Range priceRange = Ranges.range(monitorSheet, "price");
		left = priceRange.getColumn();
		top = priceRange.getRow();
		right = priceRange.getLastColumn();
		bottom = priceRange.getLastRow();
	}
	public void onCellChange$stock(CellSelectionEvent event) {
		final Worksheet sheet = event.getSheet();
		if (!monitorSheet.equals(sheet)) {
			return; //not the monitorSheet, return
		}
		final int eleft = event.getLeft();
		final int etop = event.getTop();
		final int eright = event.getRight();
		final int ebottom = event.getBottom();
		if (left > eright || eleft > right || top > ebottom || etop > bottom) {
			return; //no intersection, return
		}
		for (int row = etop; row <= ebottom; ++row) {
			for (int col = eleft; col <= eright; ++col) {
				if (left <= col && col <= right && top <= row && row <= bottom) { //in range
					final Range priceRng = Ranges.range(monitorSheet, row, col);
					final Range sellRng = priceRng.getOffset(0, 3);
					final Range buyRng = priceRng.getOffset(0, 2);
					final Range codeRng = priceRng.getOffset(0, -1);
					final double newPrice = ((Number)priceRng.getValue()).doubleValue();
					final double sellPrice = ((Number)sellRng.getValue()).doubleValue();
					final double buyPrice = ((Number)buyRng.getValue()).doubleValue();
					final String stockCode = (String) codeRng.getValue();
					if (newPrice <= buyPrice) {
						buy(stockCode, priceRng);
					} else if (newPrice >= sellPrice) {
						sell(stockCode, priceRng);
					}
				}
			}
		}
	}
	private void buy(String stockCode, Range priceRng) {
		//stockService.buy(stockCode, price);
		new Label("Buy "+stockCode+" at price: "+priceRng.getText()).setParent(message);
	}
	private void sell(String stockCode, Range priceRng) {
		new Label("Sell "+stockCode+" at price: "+priceRng.getText()).setParent(message);
	}
}

Result

Stock-result.png

View complete source of ZUML stock.zul

View complete source of composer StockComposer.java

Version History

Last Update : 2022/01/19


Version Date Content
     


All source code listed in this book is at Github.


Last Update : 2022/01/19

Copyright © Potix Corporation. This article is licensed under GNU Free Documentation License.