Class ResourceLimitHandler
java.lang.Object
sunlabs.brazil.handler.ResourceLimitHandler
- All Implemented Interfaces:
Handler
Handler for server resource management.
This handler monitors various system load parameters, and
rejects each request with a short message if any resource
limit is exceeded. The properties are evaluated at init time,
to minimize the per-request overhead of this monitor.
Properties:
- memory
- The minimum # of remaining bytes available to the vm
- threads
- The Max number of active threads
- file
- The file name or resource of the html file to return if resources run low. Defaults to "busy.html".
- retry
- The number of seconds to request the client wait before retrying the request.
- Version:
- 2.3
- Author:
- Stephen Uhler
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Constructor Summary
Constructors -
Method Summary
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Constructor Details
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ResourceLimitHandler
public ResourceLimitHandler()
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Method Details
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init
Description copied from interface:Handler
Initializes the handler.- Specified by:
init
in interfaceHandler
- Parameters:
server
- The HTTP server that created thisHandler
. TypicalHandler
s will useServer.props
to obtain run-time configuration information.prefix
- The handlers name. The string thisHandler
may prepend to all of the keys that it uses to extract configuration information fromServer.props
. This is set (by theServer
andChainHandler
) to help avoid configuration parameter namespace collisions.- Returns:
true
if thisHandler
initialized successfully,false
otherwise. Iffalse
is returned, thisHandler
should not be used.
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respond
Description copied from interface:Handler
Responds to an HTTP request.- Specified by:
respond
in interfaceHandler
- Parameters:
request
- TheRequest
object that represents the HTTP request.- Returns:
true
if the request was handled. A request was handled if a response was supplied to the client, typically by callingRequest.sendResponse()
orRequest.sendError
.- Throws:
IOException
- if there was an I/O error while sending the response to the client. Typically, in that case, theServer
will (try to) send an error message to the client and then close the client's connection.The
IOException
should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting aFileNotFoundException
due to not being able to open a file). In that case, theHandler
's duty is to turn thatIOException
into a HTTP response indicating, in this case, that a file could not be found.
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