- GenericWebAgent methods
- LWP::UserAgent related methods
Bio::DB::GenericWebAgent - helper base class for parameter-based remote server access and response retrieval.
# DO NOT USE DIRECTLY See Bio::DB::EUtilities for an example implementation
WARNING: Please do NOT spam the web servers with multiple requests.
Bio::DB::GenericWebAgent is a generic wrapper around a web agent (LWP::UserAgent), an object which can retain, format, and build parameters for the user agent (Bio::ParameterBaseI), and a BioPerl class parser that processes response content received by the user agent. The Bio::ParameterBaseI object should be state-aware, e.g. know when changes occur to parameters, so that identical requests are not repeatedly sent to the server (this base class takes this into consideration).
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : new Usage : Bio::DB::GenericWebAgent->new(@args); Function: Create new Bio::DB::GenericWebAgent instance. Returns : Args : None specific to this base class. Inheriting classes will likely set specific parameters in their constructor; Bio::DB::GenericWebAgent is primarily a test bed.
Title : parameter_base Usage : $dbi->parameter_base($pobj); Function: Get/Set Bio::ParameterBaseI. Returns : Bio::ParameterBaseI object Args : Bio::ParameterBaseI object
Title : ua Usage : $dbi->ua; Function: Get/Set LWP::UserAgent. Returns : LWP::UserAgent Args : LWP::UserAgent
Title : get_Response Usage : $agent->get_Response; Function: Get the HTTP::Response object by passing it an HTTP::Request (generated from Bio::ParameterBaseI implementation). Returns : HTTP::Response object or data if callback is used Args : (optional) -cache_response - flag to cache HTTP::Response object; Default is 1 (TRUE, caching ON) These are passed on to LWP::UserAgent::request() if stipulated -cb - use a LWP::UserAgent-compliant callback -file - dumps the response to a file (handy for large responses) Note: can't use file and callback at the same time -read_size_hint - bytes of content to read in at a time to pass to callback Note : Caching and parameter checking are set
Title : get_Parser Usage : $agent->get_Parser; Function: Return HTTP::Response content (file, fh, object) attached to defined parser Returns : None Args : None Note : Abstract method; defined by implementation
Title : delay Usage : $secs = $self->delay($secs) Function: get/set number of seconds to delay between fetches Returns : number of seconds to delay Args : new value
NOTE: the default is to use the value specified by delay_policy(). This can be overridden by calling this method.
Title : delay_policy Usage : $secs = $self->delay_policy Function: return number of seconds to delay between calls to remote db Returns : number of seconds to delay Args : none
NOTE: The default delay policy is 3s. Override in subclasses to implement delays. The timer has only second resolution, so the delay will actually be +/- 1s.
Title : _sleep Usage : $self->_sleep Function: sleep for a number of seconds indicated by the delay policy Returns : none Args : none
NOTE: This method keeps track of the last time it was called and only imposes a sleep if it was called more recently than the delay_policy() allows.
LWP::UserAgent related methods
Title : proxy Usage : $httpproxy = $db->proxy('http') or $db->proxy(['http','ftp'], 'http://myproxy' ) Function: Get/Set a proxy for use of proxy Returns : a string indicating the proxy Args : $protocol : an array ref of the protocol(s) to set/get $proxyurl : url of the proxy to use for the specified protocol $username : username (if proxy requires authentication) $password : password (if proxy requires authentication)
Title : authentication Usage : $db->authentication($user,$pass) Function: Get/Set authentication credentials Returns : Array of user/pass Args : Array or user/pass