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What is the “volatile” keyword used for?
... about when to use as I'm worried about the caching aspects. If I write a queue implementation where only 1 thread will be writing and only 1 thread will be reading, can I get by without locks and just mark my head and tail "pointers" as volatile? I want to ensure that both the reader and writer s...
Executing JavaScript without a browser?
...ck out Rhino.
The Rhino Shell provides a way to run JavaScript scripts in batch mode:
java org.mozilla.javascript.tools.shell.Main my_javascript_code.js [args]
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How to construct a REST API that takes an array of id's for the resources
...d by webserver, eg tomcat.
RESTful attempt:
POST http://example.com/api/batchtask
[
{
method : "GET",
headers : [..],
url : "/users/id1"
},
{
method : "GET",
headers : [..],
url : "/users/id2"
}
]
Server will reply URI of newly created ...
Why must wait() always be in synchronized block
...ed block with a concrete example.
Suppose we were to implement a blocking queue (I know, there is already one in the API :)
A first attempt (without synchronization) could look something along the lines below
class BlockingQueue {
Queue<String> buffer = new LinkedList<String>();
...
VC DDE（Dynamic Data Exchange）与EXCEL连接 - C/C++ - 清泛网 - 专注C/C++及内核技术
...LL,0,hConv,hszItem,CF_TEXT,
XTYP_REQUEST,5000 , NULL);
if (hData==NULL)
{
printf("Request failed: %s\n", szItem);
}
else
{
char szResult[255];
DdeGetData(hData, (unsigned char *)szResult, 255, 0);
printf("...
When to use Common Table Expression (CTE)
...itute of views in SQL Server. Common table expression is only valid in the batch of statement where it was defined and cannot be used in other sessions.
Syntax of declaring CTE(Common table expression) :-
with [Name of CTE]
as
(
Body of common table expression
)
Lets take an example :-
CREATE T...
jQuery AJAX cross domain
...he sort of API access you are looking for, and is supported by the current batch of major browsers.
See how to enable cross-origin resource sharing for client and server:
http://enable-cors.org/
"Cross-Origin Resource Sharing (CORS) is a specification that enables truly open access across domain-...
Execute Python script via crontab
I'm trying to execute a python script using the Linux crontab. I want to run this script every 10 minutes.
3 Answers
...
When to use valueChangeListener or f:ajax listener?
...le executing a business action, then fall back to valueChangeListener, but queue it to the INVOKE_APPLICATION phase.
public void changeListener(ValueChangeEvent event) {
if (event.getPhaseId() != PhaseId.INVOKE_APPLICATION) {
event.setPhaseId(PhaseId.INVOKE_APPLICATION);
event.q...
How to create an installer for a .net Windows Service using Visual Studio
...rvice as we weren't started by a user
ServiceBase.Run(new CSMessageQueueService());
}
return 0;
}
private static int InstallService()
{
var service = new MyService();
try
{
// perform specific install steps for our queue service.
service.InstallService(...