/[cvs]/nfo/perl/libs/Data/Storage.pm
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revision 1.3 by joko, Fri Oct 25 11:40:37 2002 UTC revision 1.16 by joko, Mon Jan 20 16:52:13 2003 UTC
# Line 1  Line 1 
1  #################################  ## ------------------------------------------------------------------------
2  #  ##
3  #  $Id$  ##    $Id$
4  #  ##
5  #  $Log$  ##    Copyright (c) 2002  Andreas Motl <andreas.motl@ilo.de>
6  #  Revision 1.3  2002/10/25 11:40:37  joko  ##
7  #  + enhanced robustness  ##    See COPYRIGHT section in pod text below for usage and distribution rights.
8  #  + more logging for debug-levels  ##
9  #  + sub dropDb  ## ------------------------------------------------------------------------
10  #  ##
11  #  Revision 1.2  2002/10/17 00:04:29  joko  ##  $Log$
12  #  + sub createDb  ##  Revision 1.16  2003/01/20 16:52:13  joko
13  #  + sub isConnected  ##  + now using 'DesignPattern::Object' to create a new 'Data::Storage::Handler::Xyz' on demand - before we did this in a hand-rolled fashion
14  #  + bugfixes regarding "deep recursion" stuff  ##
15  #  ##  Revision 1.15  2003/01/19 03:12:59  joko
16  #  Revision 1.1  2002/10/10 03:43:12  cvsjoko  ##  + modified header
17  #  + new  ##  - removed pod-documentation - now in 'Storage.pod'
18  #  ##
19  #  ##  Revision 1.14  2002/12/19 16:27:59  joko
20  #################################  ##  - moved 'sub dropDb' to Data::Storage::Handler::DBI
21    ##
22  # aim_V1: should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary way ;)  ##  Revision 1.13  2002/12/17 21:54:12  joko
23  # aim_V2: introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:  ##  + feature when using Tangram:
24  #               - Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file  ##    + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID)
25    ##        + patched Tangram::Storage (jonen)
26    ##        + enhanced Data::Storage::Schema::Tangram (joko)
27    ##        + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen)
28    ##    + how?
29    ##        + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level
30    ##        + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN
31    ##        + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application
32    ##
33    ##  Revision 1.12  2002/12/12 02:50:15  joko
34    ##  + this now (unfortunately) needs DBI for some helper functions
35    ##  + TODO: these have to be refactored to another scope! (soon!)
36    ##
37    ##  Revision 1.11  2002/12/11 06:53:19  joko
38    ##  + updated pod
39    ##
40    ##  Revision 1.10  2002/12/07 03:37:23  joko
41    ##  + updated pod
42    ##
43    ##  Revision 1.9  2002/12/01 22:15:45  joko
44    ##  - sub createDb: moved to handler
45    ##
46    ##  Revision 1.8  2002/11/29 04:48:23  joko
47    ##  + updated pod
48    ##
49    ##  Revision 1.7  2002/11/17 06:07:18  joko
50    ##  + creating the handler is easier than proposed first - for now :-)
51    ##  + sub testAvailability
52    ##
53    ##  Revision 1.6  2002/11/09 01:04:58  joko
54    ##  + updated pod
55    ##
56    ##  Revision 1.5  2002/10/29 19:24:18  joko
57    ##  - reduced logging
58    ##  + added some pod
59    ##
60    ##  Revision 1.4  2002/10/27 18:35:07  joko
61    ##  + added pod
62    ##
63    ##  Revision 1.3  2002/10/25 11:40:37  joko
64    ##  + enhanced robustness
65    ##  + more logging for debug-levels
66    ##  + sub dropDb
67    ##
68    ##  Revision 1.2  2002/10/17 00:04:29  joko
69    ##  + sub createDb
70    ##  + sub isConnected
71    ##  + bugfixes regarding "deep recursion" stuff
72    ##
73    ##  Revision 1.1  2002/10/10 03:43:12  cvsjoko
74    ##  + new
75    ## ------------------------------------------------------------------------
76    
77    
78    BEGIN {
79      $Data::Storage::VERSION = 0.03;
80    }
81    
82  package Data::Storage;  package Data::Storage;
83    
84  use strict;  use strict;
85  use warnings;  use warnings;
86    
87    use Data::Dumper;
88    # FIXME: wipe out!
89    use DBI;
90    
91  use Data::Storage::Locator;  use Data::Storage::Locator;
92    use DesignPattern::Object;
93    
94    
95    # TODO: actually implement level (integrate with Log::Dispatch)
96    my $TRACELEVEL = 0;
97    
98  # get logger instance  # get logger instance
99  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 37  sub new { Line 102  sub new {
102    my $invocant = shift;    my $invocant = shift;
103    my $class = ref($invocant) || $invocant;    my $class = ref($invocant) || $invocant;
104    #my @args = normalizeArgs(@_);    #my @args = normalizeArgs(@_);
105      
106    my $arg_locator = shift;    my $arg_locator = shift;
107    my $arg_options = shift;    my $arg_options = shift;
108      
109      if (!$arg_locator) {
110        $logger->critical( __PACKAGE__ . "->new: No locator passed in!" );
111        return;
112      }
113    
114    #my $self = { STORAGEHANDLE => undef, @_ };    #my $self = { STORAGEHANDLE => undef, @_ };
115    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
116    $logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );    #$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
117      $logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" );
118    return bless $self, $class;    return bless $self, $class;
119  }  }
120    
# Line 54  sub AUTOLOAD { Line 125  sub AUTOLOAD {
125    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"
126    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"
127    #     - Deep recursion on anonymous subroutine at [...]    #     - Deep recursion on anonymous subroutine at [...]
128    # we also might filter log messages caused by logging itself in "advanced logging of AUTOLOAD calls"    # we also might filter log messages caused by logging to itself in "advanced logging of AUTOLOAD calls"
129        
130    my $self = shift;    my $self = shift;
131    our $AUTOLOAD;    our $AUTOLOAD;
# Line 65  sub AUTOLOAD { Line 136  sub AUTOLOAD {
136    my $method = $AUTOLOAD;    my $method = $AUTOLOAD;
137    $method =~ s/^.*:://;    $method =~ s/^.*:://;
138    
139    # advanced logging of AUTOLOAD calls    # advanced logging of AUTOLOAD calls ...
140      my $logstring = "";    # ... nice but do it only when TRACING (TODO) is enabled
141      $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;        my $logstring = "";
142      #print "count: ", $#_, "\n";        $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;
143      #$logstring .= Dumper(@_) if ($#_ != -1);        #print "count: ", $#_, "\n";
144      my $tabcount = int( (80 - length($logstring)) / 10 );        #$logstring .= Dumper(@_) if ($#_ != -1);
145      $logstring .= "\t" x $tabcount . "(AUTOLOAD)";        my $tabcount = int( (80 - length($logstring)) / 10 );
146      # TODO: only ok if logstring doesn't contain        $logstring .= "\t" x $tabcount . "(AUTOLOAD)";
147      #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"        # TODO: only ok if logstring doesn't contain
148      # but that would be way too specific as long as we don't have an abstract handler for this  ;)        #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"
149      $logger->debug( $logstring );        # but that would be _way_ too specific as long as we don't have an abstract handler for this  ;)
150        if ($TRACELEVEL) {
151    # filtering AUTOLOAD calls        $logger->debug( $logstring );
152          #print join('; ', @_);
153        }
154        
155      # filtering AUTOLOAD calls and first-time-touch of the actual storage impl
156    if ($self->_filter_AUTOLOAD($method)) {    if ($self->_filter_AUTOLOAD($method)) {
157      $self->_accessStorage();      $self->_accessStorage();
158      $self->{STORAGEHANDLE}->$method(@_);      if ($self->{STORAGEHANDLE}) {
159          return $self->{STORAGEHANDLE}->$method(@_);
160        } else {
161          $logger->critical( __PACKAGE__ . "->AUTOLOAD: ERROR: " . $logstring );
162          return;
163        }
164    }    }
165        
166  }  }
# Line 109  sub normalizeArgs { Line 189  sub normalizeArgs {
189  sub _accessStorage {  sub _accessStorage {
190    my $self = shift;    my $self = shift;
191    # TODO: to some tracelevel!    # TODO: to some tracelevel!
192    $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorage()" );    if ($TRACELEVEL) {
193        $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorage()" );
194      }
195    if (!$self->{STORAGEHANDLE}) {    if (!$self->{STORAGEHANDLE}) {
196      $self->_createStorageHandle();      return $self->_createStorageHandle();
197    }    }
198  }  }
199    
200  sub _createStorageHandle {  sub _createStorageHandle1 {
201    my $self = shift;    my $self = shift;
   
202    my $type = $self->{locator}->{type};    my $type = $self->{locator}->{type};
203    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
204    
205    my $pkg = "Data::Storage::Handler::" . $type . "";    my $pkg = "Data::Storage::Handler::" . $type . "";
206        
207    # propagate args to handler    # try to load perl module at runtime
208    # needs some more thoughts! (not only "dbi" to Tangram, when (in future) db is not more the common case)    my $evalstr = "use $pkg;";
209    if ($type eq 'DBI') {    eval($evalstr);
210      use Data::Storage::Handler::DBI;    if ($@) {
211      #my @args = %{$self->{locator}->{dbi}};      $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
212      my @args = %{$self->{locator}};      return;
     # create new storage handle  
     $self->{STORAGEHANDLE} = $pkg->new( @args );  
213    }    }
214    if ($type eq 'Tangram') {    
215      use Data::Storage::Handler::Tangram;    # build up some additional arguments to pass on
216      #$self->{STORAGEHANDLE} = $pkg->new( dsn => $self->{locator}->{dbi}->{dsn} );    #my @args = %{$self->{locator}};
217      #my @args = %{$self->{locator}->{dbi}};    my @args = ();
218      my @args = %{$self->{locator}};  
219      # create new storage handle    # - create new storage handle object
220      $self->{STORAGEHANDLE} = $pkg->new( @args );    # - propagate arguments to handler
221      # - pass locator by reference to be able to store status- or meta-information in it
222      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
223    
224      #$self->{STORAGEHANDLE_UNDERLYING} = $self->{STORAGEHANDLE}->getUnderlyingStorage();  }
225      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();  
226    sub _createStorageHandle {
227      my $self = shift;
228      my $type = $self->{locator}->{type};
229      $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
230    
231    #print Dumper($self);
232    #exit;
233    
234      my $pkg = "Data::Storage::Handler::" . $type . "";
235      
236      # try to load perl module at runtime
237    =pod
238      my $evalstr = "use $pkg;";
239      eval($evalstr);
240      if ($@) {
241        $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
242        return;
243    }    }
244        
245      # build up some additional arguments to pass on
246      #my @args = %{$self->{locator}};
247      my @args = ();
248    
249      # - create new storage handle object
250      # - propagate arguments to handler
251      # - pass locator by reference to be able to store status- or meta-information in it
252      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
253    =cut
254    
255      $self->{STORAGEHANDLE} = DesignPattern::Object->fromPackage( $pkg, locator => $self->{locator} );
256      return 1;
257    
258  }  }
259    
260  sub addLogDispatchHandler {  sub addLogDispatchHandler {
# Line 175  sub addLogDispatchHandler { Line 286  sub addLogDispatchHandler {
286  }  }
287    
288  sub removeLogDispatchHandler {  sub removeLogDispatchHandler {
289      my $self = shift;
290        my $self = shift;    my $name = shift;
291        my $name = shift;    #my $logger = shift;
292        #my $logger = shift;    $logger->remove($name);
   
       $logger->remove($name);  
   
293  }  }
294    
295    =pod
296  sub getDbName {  sub getDbName {
297    my $self = shift;    my $self = shift;
298    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
# Line 192  sub getDbName { Line 301  sub getDbName {
301    return $database_name;    return $database_name;
302  }  }
303    
304  sub testDsn {  sub testAvailability {
305    my $self = shift;    my $self = shift;
306    my $dsn = $self->{locator}->{dbi}->{dsn};    my $status = $self->testDsn();
307    my $result;    $self->{locator}->{status}->{available} = $status;
308    if ( my $dbh = DBI->connect($dsn, '', '', {    return $status;
                                                       PrintError => 0,  
                                                       } ) ) {  
     $dbh->disconnect();  
     return 1;  
   } else {  
     $logger->error( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );  
   }  
309  }  }
310    
311  sub createDb {  sub isConnected {
312    my $self = shift;    my $self = shift;
313    my $dsn = $self->{locator}->{dbi}->{dsn};    # TODO: REVIEW!
314      return 1 if $self->{STORAGEHANDLE};
   $logger->debug( __PACKAGE__ .  "->createDb( dsn $dsn )" );  
   
   $dsn =~ s/database=(.+?);//;  
   my $database_name = $1;  
   
   my $ok;  
     
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                       } ) ) {  
     if ($database_name) {  
       if ($dbh->do("CREATE DATABASE $database_name;")) {  
         $ok = 1;  
       }  
     }  
     $dbh->disconnect();  
   }  
     
   return $ok;  
     
315  }  }
316    
317  sub dropDb {  sub testDsn {
318    my $self = shift;    my $self = shift;
319    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
320      my $result;
   $logger->debug( __PACKAGE__ .  "->dropDb( dsn $dsn )" );  
   
   $dsn =~ s/database=(.+?);//;  
   my $database_name = $1;  
   
   my $ok;  
     
321    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', {
322                                                        PrintError => 0,                                                        PrintError => 0,
323                                                        } ) ) {                                                        } ) ) {
324      if ($database_name) {      
325        if ($dbh->do("DROP DATABASE $database_name;")) {      # TODO: REVIEW
         $ok = 1;  
       }  
     }  
326      $dbh->disconnect();      $dbh->disconnect();
327        
328        return 1;
329      } else {
330        $logger->warning( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );
331    }    }
     
   return $ok;  
 }  
   
 sub isConnected {  
   my $self = shift;  
   return 1 if $self->{STORAGEHANDLE};  
332  }  }
333    =cut
334    
 1;  
335    1;
336    __END__
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