Created
March 9, 2012 14:53
-
-
Save G-WAN/2006843 to your computer and use it in GitHub Desktop.
G-WAN / Java - please help to write Gwan.get_arg() call
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // ============================================================================ | |
| // Java servlet example for the G-WAN Web App. Server (http://trustleap.ch/) | |
| // ---------------------------------------------------------------------------- | |
| // loan.java: G-WAN's version of the Java loan http://gwan.ch/source/loan.jsp | |
| // written for GlassFish (follow the link above for details). | |
| // ---------------------------------------------------------------------------- | |
| // This Java code is served very quickly by G-WAN (despite C/Java conversions). | |
| // See below (the " -t 6" option setups 6 client worker threads for 6 Cores): | |
| // | |
| // weighttp -n 1000000 -c 300 -t 6 -k -H "Accept-Encoding: gzip" \ | |
| // "http://127.0.0.1:80/?loan.java&name=Eva&amount=10000&rate=3.5&term=1" | |
| // finished in 1 sec, 748 millisec, 571778 req/s, 1286500 kbyte/s | |
| // requests: 1000000 total/started/done/succeeded, 0 failed/errored | |
| // status codes: 1000000 2xx, 0 3xx, 0 4xx, 0 5xx | |
| // traffic: 2303999915 bytes total, 276999915 bytes http, 2027000000 bytes data | |
| // | |
| // On the same machine, Tomcat's HelloWorld example does: | |
| // (installation: https://help.ubuntu.com/11.04/serverguide/C/tomcat.html) | |
| // (administration https://help.ubuntu.com/community/ApacheTomcat5) | |
| // | |
| // weighttp -n 1000000 -c 300 -t 6 -k -H "Accept-Encoding: gzip" \ | |
| // "http://127.0.0.1:8080/examples/servlets/servlet/HelloWorldExample" | |
| // finished in 12 sec, 278 millisec, 81441 req/s, 39024 kbyte/s | |
| // requests: 1000000 total/started/done/succeeded, 0 failed/errored | |
| // status codes: 1000000 2xx, 0 3xx, 0 4xx, 0 5xx | |
| // traffic: 490671704 bytes total, 131671704 bytes http, 359000000 bytes data | |
| // | |
| // Server bytes sent kbyte/sec requests/sec servlet time | |
| // ------ -------------- --------- ------------ ---------- ------ | |
| // G-WAN 2,303,999,915 1,286,500 571,778 loan.java 1 sec | |
| // Tomcat 490,671,704 39,024 81,441 hello.java 12 sec | |
| // | |
| // The next best Web servers do not even reach 571,778 req/s when serving mere | |
| // static contents. G-WAN is making dynamic contents fly (high). | |
| // ---------------------------------------------------------------------------- | |
| import api.Gwan; | |
| public class loan // the class name MUST match the script *.java filename | |
| { | |
| public static int jmain(long env, String[] args) | |
| { | |
| String m_out = ""; | |
| // ---- requests without parameters trigger a redirect to the input form | |
| if(args.length == 0) | |
| { | |
| m_out = "HTTP/1.1 302 Found\r\n" | |
| + "Content-type:text/html\r\n" | |
| + "Location: /csp_loan.html\r\n\r\n" | |
| + "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">" | |
| + "<html><head><title>Redirect</title></head>" | |
| + "<body>Click <a href=\"/csp_loan.html\">HERE</A> for redirect.</body>" | |
| + "</html>"; | |
| } | |
| else | |
| { | |
| // ---- process a GET query with parameters | |
| long start = Gwan.getUs(); | |
| double payment, interest, principal, cost, amount, rate, term; | |
| int month=0, year=1, lastpayment=1; | |
| String[] Months={"January","February","March","April","May","June", | |
| "July", "August","September","October","November","December"}; | |
| // the form field "names" we want to find values for | |
| String szName="-", Name="", Amount="0.0", Rate="0.0", Term="0.0"; | |
| // anyone volunter to write a Java equivalent for G-WAN's get_arg()? | |
| switch(args[0].charAt(0)) | |
| { | |
| case 'a': Amount = args[0].substring(args[0].indexOf('=') + 1); break; | |
| case 'n': Name = args[0].substring(args[0].indexOf('=') + 1); break; | |
| case 'r': Rate = args[0].substring(args[0].indexOf('=') + 1); break; | |
| case 't': Term = args[0].substring(args[0].indexOf('=') + 1); break; | |
| } | |
| switch(args[1].charAt(0)) | |
| { | |
| case 'a': Amount = args[1].substring(args[1].indexOf('=') + 1); break; | |
| case 'n': Name = args[1].substring(args[1].indexOf('=') + 1); break; | |
| case 'r': Rate = args[1].substring(args[1].indexOf('=') + 1); break; | |
| case 't': Term = args[1].substring(args[1].indexOf('=') + 1); break; | |
| } | |
| switch(args[2].charAt(0)) | |
| { | |
| case 'a': Amount = args[2].substring(args[2].indexOf('=') + 1); break; | |
| case 'n': Name = args[2].substring(args[2].indexOf('=') + 1); break; | |
| case 'r': Rate = args[2].substring(args[2].indexOf('=') + 1); break; | |
| case 't': Term = args[2].substring(args[2].indexOf('=') + 1); break; | |
| } | |
| switch(args[3].charAt(0)) | |
| { | |
| case 'a': Amount = args[3].substring(args[3].indexOf('=') + 1); break; | |
| case 'n': Name = args[3].substring(args[3].indexOf('=') + 1); break; | |
| case 'r': Rate = args[3].substring(args[3].indexOf('=') + 1); break; | |
| case 't': Term = args[3].substring(args[3].indexOf('=') + 1); break; | |
| } | |
| // set default values if a parameter is missing | |
| if(Name == null) Name ="-"; | |
| if(Amount == null) Amount ="100000.0"; | |
| if(Rate == null) Rate ="3.5"; | |
| if(Term == null) Term ="10.0"; | |
| // all litteral strings provided by a client must be escaped this way | |
| // if you inject them into an HTML page | |
| //public static String escape_html(String Name) | |
| { | |
| int len = Name.length(); | |
| StringBuffer sb = new StringBuffer(len); | |
| int c; | |
| for(int i = 0; i < len; i++) | |
| { | |
| c = Name.charAt(i); | |
| if(c == ' ') sb.append(" "); else | |
| if(c == '"') sb.append("""); else | |
| if(c == '&') sb.append("&"); else | |
| if(c == '<') sb.append("<"); else | |
| if(c == '>') sb.append(">"); else | |
| if(c == '\n') sb.append("<br/>"); | |
| else | |
| { | |
| c = c&0xffff; // unicode | |
| if(c < 32 || c > 127) | |
| { | |
| sb.append("&#"); | |
| sb.append(new Integer(c).toString()); | |
| sb.append(';'); | |
| } | |
| else | |
| sb.append(c); | |
| } | |
| } | |
| //return sb.toString(); | |
| szName = sb.toString(); | |
| } | |
| // filter input data to avoid all the useless or nasty cases | |
| amount = Double.parseDouble(Amount); | |
| if(amount < 1.0) | |
| amount = 1.0; | |
| rate = Double.parseDouble(Rate); | |
| if(rate > 19.0) | |
| rate = 20.0; | |
| if(rate > 1.0) | |
| rate = rate/100.0; | |
| else | |
| if(rate < 1.0) | |
| rate = 1.0/100.0; | |
| term = Double.parseDouble(Term); | |
| if(term < 0.1) | |
| term = 1.0/12.0; | |
| // do not do this in production... | |
| //else | |
| //if(term > 90.0) | |
| // term = 90.0; | |
| // calculate the monthly payment amount | |
| payment = amount*rate/12*Math.pow(1+rate/12, term*12) | |
| / (Math.pow(1+rate/12, term*12)-1); | |
| cost = (term*12*payment)-amount; | |
| // build the top of our HTML page | |
| m_out += String.format( | |
| "<!DOCTYPE HTML>" | |
| + "<html lang=\"en\"><head><title>Loan Calculator</title><meta http-equiv" | |
| + "=\"Content-Type\" content=\"text/html; charset=utf-8\">" | |
| + "<link href=\"/imgs/style.css\" rel=\"stylesheet\" type=\"text/css\">" | |
| + "</head><body style=\"margin:16px;\">" | |
| + "<h2>Dear %s, your loan goes as follows:</h2><br>", Name); | |
| // (szName.length() < 2 || szName.charAt(0) == '-') ? "client" : szName); | |
| m_out += String.format( | |
| "<table class=\"clean\" width=240px>" | |
| +"<tr><th>loan</th><th>details</th></tr>" | |
| +"<tr class=\"d1\"><td>Amount</td><td>%,.2f" | |
| +"</td></tr><tr class=\"d0\"><td>Rate</td><td>" | |
| +"%,.2f%%</td></tr><tr class=\"d1\"><td>Term</td><td>" | |
| +"%d %s(s)</td></tr><tr class=\"d0\"><td>Cost</td><td>" | |
| +"%,.2f (%3.2f%%)</td></tr></table>", | |
| amount, | |
| rate * 100, | |
| (int)(((int)term>0)?term:Math.ceil(12*term)), | |
| ((int)term>0)?"year":"month", | |
| cost, | |
| 100/(amount/cost)); | |
| m_out += String.format( | |
| "<br><table class=\"clean\" width=112px>" | |
| +"<tr class=\"d1\"><td><b>YEAR %d" | |
| +"</b></td></tr></table>" | |
| +"<table class=\"clean\" width=550px>" | |
| +"<tr><th>month</th><th>payment</th><th>interest</th>" | |
| +"<th>principal</th><th>balance</th></tr>", | |
| year); | |
| // output monthly payments | |
| for(;;) | |
| { | |
| month = month+1; | |
| interest = (amount*rate)/12; | |
| if(amount>payment) | |
| { | |
| amount = (amount-payment)+interest; | |
| principal = payment-interest; | |
| } | |
| else | |
| { | |
| // calculate last payment | |
| if(lastpayment>0) | |
| { | |
| lastpayment = 0; | |
| payment = amount; | |
| principal = amount-interest; | |
| amount = 0; | |
| } | |
| else | |
| { | |
| // all payments are done, just padd the table | |
| amount = 0; | |
| payment = 0; | |
| interest = 0; | |
| principal = 0; | |
| } | |
| } | |
| m_out += String.format( | |
| "<tr class=\"d%d\"><td>%s</td><td>%,.2f</td><td>%,.2f" | |
| +"</td><td>%,.2f</td><td>%,.2f</td></tr>", | |
| month & 1, Months[month - 1], | |
| payment, | |
| interest, | |
| principal, | |
| amount); | |
| if(month==12) | |
| { | |
| if(amount>0) | |
| { | |
| month=0; year=year+1; | |
| m_out += String.format( | |
| "</table><br><table class=\"clean\" width=112px>" | |
| +"<tr class=\"d1\"><td><b>YEAR %d" | |
| +"</b></td></tr></table>" | |
| +"<table class=\"clean\" width=550px>" | |
| +"<tr><th>month</th><th>payment</th><th>interest" | |
| +"</th><th>principal</th><th>balance</th></tr>", | |
| year); | |
| } | |
| else | |
| { | |
| break; | |
| } | |
| } | |
| } | |
| // time the process and close the HTML page | |
| m_out += String.format( | |
| "</table><br>This page was generated in %,.2f ms." | |
| +"<br>(on a 3GHz CPU 1 ms = 3,000,000 cycles)" | |
| +"<br></body></html>", (Gwan.getUs() - start)/1000.0); | |
| } | |
| Gwan.xbufCat(Gwan.getReply(env), m_out); | |
| return 200; | |
| } | |
| } | |
| // ============================================================================ | |
| // End of Source Code | |
| // ============================================================================ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Note: the Gwan.get_arg() hardcoded code above works fine in this example but a generic version would help end-users.