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java.lang.Object
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+--java.lang.Thread
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+--sunlabs.brazil.handler.PollHandler
Handler for periodically polling another web site, whose results are (optionally) added to the server's properties. This also includes the ability to request URL's on a cron-like schedule.
The result of fetching the url is expected to be a text document in java Properties format.
Properties:
url above.
[token].name and [token].value
define a new http header.
sessionTable (see below)parameter is
identical to the sessionTable parameter of
the SetTemplate, then this specifies the
namespace parameter that may be used with
the SetTemplate "namespace" parameter to
obtain the extracted data. Defaults to the "prepend" parameter.
date format specifier
to use for matching "match"
patterns. Defaults to "EE-MM-dd-HH-mm".
host:port, or host
it the desired port is 80.
sessionTable
used by the SetTemplate to allow
values obtained by this handler to be accessable from within
templates.
If the sessionTable is set, the namespace
value is used to name the table (e.g. the namespace
specified by SetTemplate. If no
namespace parameter is given, then prepend is used
as the namespace parameter.
If prepend is specified, the following additional properties are created, and added to the properties with the specified prefix.
| Field Summary | |
int |
interval
|
String |
post
|
String |
url
|
| Fields inherited from class java.lang.Thread |
MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY |
| Constructor Summary | |
PollHandler()
|
|
| Method Summary | |
void |
fillProps(Properties props,
HttpRequest target)
Fill the properties from the input stream |
boolean |
init(Server server,
String prefix)
Set up the initial configuration, and kick off a thread to periodically fetch the url. |
boolean |
respond(Request request)
This might allow control over the polling via requests at a later date. |
void |
run()
Periodically poll the url, and copy the results into the server properties. |
| Methods inherited from class java.lang.Thread |
activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield |
| Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Field Detail |
public String url
public String post
public int interval
| Constructor Detail |
public PollHandler()
| Method Detail |
public boolean init(Server server,
String prefix)
init in interface Handlerserver - The HTTP server that created this Handler.
Typical Handlers will use Server.props
to obtain run-time configuration information.prefix - The handlers name.
The string this Handler may prepend to all
of the keys that it uses to extract configuration information
from Server.props. This is set (by the Server
and ChainHandler) to help avoid configuration parameter
namespace collisions.
true if this Handler initialized
successfully, false otherwise. If
false is returned, this Handler
should not be used.public boolean respond(Request request)
respond in interface Handlerrequest - The Request object that represents the HTTP
request.
true if the request was handled. A request was
handled if a response was supplied to the client, typically
by calling Request.sendResponse() or
Request.sendError.public void run()
run in interface Runnablerun in class Thread
public void fillProps(Properties props,
HttpRequest target)
throws IOException
IOException
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Version 2.1, Generated 12/30/04 Copyright (c) 2001-2004, Sun Microsystems. |
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