/[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 1.18 by joko, Thu Jan 30 22:12:17 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 1.18  2003/01/30 22:12:17  joko
13  #  + sub isConnected  ##  - removed/refactored old code: ->Data::Storage::Handler::Tangram|DBI
14  #  + bugfixes regarding "deep recursion" stuff  ##
15  #  ##  Revision 1.17  2003/01/30 21:42:22  joko
16  #  Revision 1.1  2002/10/10 03:43:12  cvsjoko  ##  + minor update: renamed method
17  #  + new  ##
18  #  ##  Revision 1.16  2003/01/20 16:52:13  joko
19  #  ##  + now using 'DesignPattern::Object' to create a new 'Data::Storage::Handler::Xyz' on demand - before we did this in a hand-rolled fashion
20  #################################  ##
21    ##  Revision 1.15  2003/01/19 03:12:59  joko
22  # aim_V1: should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary way ;)  ##  + modified header
23  # aim_V2: introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:  ##  - removed pod-documentation - now in 'Storage.pod'
24  #               - Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file  ##
25    ##  Revision 1.14  2002/12/19 16:27:59  joko
26    ##  - moved 'sub dropDb' to Data::Storage::Handler::DBI
27    ##
28    ##  Revision 1.13  2002/12/17 21:54:12  joko
29    ##  + feature when using Tangram:
30    ##    + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID)
31    ##        + patched Tangram::Storage (jonen)
32    ##        + enhanced Data::Storage::Schema::Tangram (joko)
33    ##        + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen)
34    ##    + how?
35    ##        + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level
36    ##        + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN
37    ##        + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application
38    ##
39    ##  Revision 1.12  2002/12/12 02:50:15  joko
40    ##  + this now (unfortunately) needs DBI for some helper functions
41    ##  + TODO: these have to be refactored to another scope! (soon!)
42    ##
43    ##  Revision 1.11  2002/12/11 06:53:19  joko
44    ##  + updated pod
45    ##
46    ##  Revision 1.10  2002/12/07 03:37:23  joko
47    ##  + updated pod
48    ##
49    ##  Revision 1.9  2002/12/01 22:15:45  joko
50    ##  - sub createDb: moved to handler
51    ##
52    ##  Revision 1.8  2002/11/29 04:48:23  joko
53    ##  + updated pod
54    ##
55    ##  Revision 1.7  2002/11/17 06:07:18  joko
56    ##  + creating the handler is easier than proposed first - for now :-)
57    ##  + sub testAvailability
58    ##
59    ##  Revision 1.6  2002/11/09 01:04:58  joko
60    ##  + updated pod
61    ##
62    ##  Revision 1.5  2002/10/29 19:24:18  joko
63    ##  - reduced logging
64    ##  + added some pod
65    ##
66    ##  Revision 1.4  2002/10/27 18:35:07  joko
67    ##  + added pod
68    ##
69    ##  Revision 1.3  2002/10/25 11:40:37  joko
70    ##  + enhanced robustness
71    ##  + more logging for debug-levels
72    ##  + sub dropDb
73    ##
74    ##  Revision 1.2  2002/10/17 00:04:29  joko
75    ##  + sub createDb
76    ##  + sub isConnected
77    ##  + bugfixes regarding "deep recursion" stuff
78    ##
79    ##  Revision 1.1  2002/10/10 03:43:12  cvsjoko
80    ##  + new
81    ## ------------------------------------------------------------------------
82    
83    
84    BEGIN {
85      $Data::Storage::VERSION = 0.03;
86    }
87    
88  package Data::Storage;  package Data::Storage;
89    
90  use strict;  use strict;
91  use warnings;  use warnings;
92    
93    use Data::Dumper;
94    # FIXME: wipe out!
95    use DBI;
96    
97  use Data::Storage::Locator;  use Data::Storage::Locator;
98    use DesignPattern::Object;
99    
100    
101    # TODO: actually implement level (integrate with Log::Dispatch)
102    my $TRACELEVEL = 0;
103    
104  # get logger instance  # get logger instance
105  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 37  sub new { Line 108  sub new {
108    my $invocant = shift;    my $invocant = shift;
109    my $class = ref($invocant) || $invocant;    my $class = ref($invocant) || $invocant;
110    #my @args = normalizeArgs(@_);    #my @args = normalizeArgs(@_);
111      
112    my $arg_locator = shift;    my $arg_locator = shift;
113    my $arg_options = shift;    my $arg_options = shift;
114      
115      if (!$arg_locator) {
116        $logger->critical( __PACKAGE__ . "->new: No locator passed in!" );
117        return;
118      }
119    
120    #my $self = { STORAGEHANDLE => undef, @_ };    #my $self = { STORAGEHANDLE => undef, @_ };
121    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
122    $logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );    #$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
123      $logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" );
124    return bless $self, $class;    return bless $self, $class;
125  }  }
126    
# Line 54  sub AUTOLOAD { Line 131  sub AUTOLOAD {
131    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"
132    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"
133    #     - Deep recursion on anonymous subroutine at [...]    #     - Deep recursion on anonymous subroutine at [...]
134    # 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"
135        
136    my $self = shift;    my $self = shift;
137    our $AUTOLOAD;    our $AUTOLOAD;
# Line 65  sub AUTOLOAD { Line 142  sub AUTOLOAD {
142    my $method = $AUTOLOAD;    my $method = $AUTOLOAD;
143    $method =~ s/^.*:://;    $method =~ s/^.*:://;
144    
145    # advanced logging of AUTOLOAD calls    # advanced logging of AUTOLOAD calls ...
146      my $logstring = "";    # ... nice but do it only when TRACING (TODO) is enabled
147      $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;        my $logstring = "";
148      #print "count: ", $#_, "\n";        $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;
149      #$logstring .= Dumper(@_) if ($#_ != -1);        #print "count: ", $#_, "\n";
150      my $tabcount = int( (80 - length($logstring)) / 10 );        #$logstring .= Dumper(@_) if ($#_ != -1);
151      $logstring .= "\t" x $tabcount . "(AUTOLOAD)";        my $tabcount = int( (80 - length($logstring)) / 10 );
152      # TODO: only ok if logstring doesn't contain        $logstring .= "\t" x $tabcount . "(AUTOLOAD)";
153      #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"        # TODO: only ok if logstring doesn't contain
154      # 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)"
155      $logger->debug( $logstring );        # but that would be _way_ too specific as long as we don't have an abstract handler for this  ;)
156        if ($TRACELEVEL) {
157    # filtering AUTOLOAD calls        $logger->debug( $logstring );
158          #print join('; ', @_);
159        }
160        
161      # filtering AUTOLOAD calls and first-time-touch of the actual storage impl
162    if ($self->_filter_AUTOLOAD($method)) {    if ($self->_filter_AUTOLOAD($method)) {
163      $self->_accessStorage();      #print "=== FILTER!", "\n";
164      $self->{STORAGEHANDLE}->$method(@_);      $self->_accessStorageHandle();
165        if ($self->{STORAGEHANDLE}) {
166          return $self->{STORAGEHANDLE}->$method(@_);
167        } else {
168          $logger->critical( __PACKAGE__ . "->AUTOLOAD: ERROR: " . $logstring );
169          return;
170        }
171    }    }
172        
173  }  }
# Line 97  sub _filter_AUTOLOAD { Line 184  sub _filter_AUTOLOAD {
184  }  }
185    
186    
187  sub normalizeArgs {  sub _accessStorageHandle {
   my %args = @_;  
   if (!$args{dsn} && $args{meta}{dsn}) {  
     $args{dsn} = $args{meta}{dsn};  
   }  
   my @result = %args;  
   return @result;  
 }  
   
 sub _accessStorage {  
188    my $self = shift;    my $self = shift;
189    # TODO: to some tracelevel!    # TODO: to some tracelevel!
190    $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorage()" );    #print "=========== _accessStorage", "\n";
191      if ($TRACELEVEL) {
192        $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorageHandle()" );
193      }
194    if (!$self->{STORAGEHANDLE}) {    if (!$self->{STORAGEHANDLE}) {
195      $self->_createStorageHandle();      return $self->_createStorageHandle();
196    }    }
197  }  }
198    
199  sub _createStorageHandle {  sub _createStorageHandle1 {
200    my $self = shift;    my $self = shift;
   
201    my $type = $self->{locator}->{type};    my $type = $self->{locator}->{type};
202    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
203    
204    my $pkg = "Data::Storage::Handler::" . $type . "";    my $pkg = "Data::Storage::Handler::" . $type . "";
205        
206    # propagate args to handler    # try to load perl module at runtime
207    # needs some more thoughts! (not only "dbi" to Tangram, when (in future) db is not more the common case)    my $evalstr = "use $pkg;";
208    if ($type eq 'DBI') {    eval($evalstr);
209      use Data::Storage::Handler::DBI;    if ($@) {
210      #my @args = %{$self->{locator}->{dbi}};      $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
211      my @args = %{$self->{locator}};      return;
     # create new storage handle  
     $self->{STORAGEHANDLE} = $pkg->new( @args );  
212    }    }
213    if ($type eq 'Tangram') {    
214      use Data::Storage::Handler::Tangram;    # build up some additional arguments to pass on
215      #$self->{STORAGEHANDLE} = $pkg->new( dsn => $self->{locator}->{dbi}->{dsn} );    #my @args = %{$self->{locator}};
216      #my @args = %{$self->{locator}->{dbi}};    my @args = ();
217      my @args = %{$self->{locator}};  
218      # create new storage handle    # - create new storage handle object
219      $self->{STORAGEHANDLE} = $pkg->new( @args );    # - propagate arguments to handler
220      # - pass locator by reference to be able to store status- or meta-information in it
221      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
222    
223      #$self->{STORAGEHANDLE_UNDERLYING} = $self->{STORAGEHANDLE}->getUnderlyingStorage();  }
224      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();  
225    sub _createStorageHandle {
226      my $self = shift;
227      my $type = $self->{locator}->{type};
228      $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
229    
230    #print Dumper($self);
231    #exit;
232    
233      my $pkg = "Data::Storage::Handler::" . $type . "";
234      
235      # try to load perl module at runtime
236    =pod
237      my $evalstr = "use $pkg;";
238      eval($evalstr);
239      if ($@) {
240        $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
241        return;
242    }    }
243        
244      # build up some additional arguments to pass on
245      #my @args = %{$self->{locator}};
246      my @args = ();
247    
248      # - create new storage handle object
249      # - propagate arguments to handler
250      # - pass locator by reference to be able to store status- or meta-information in it
251      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
252    =cut
253    
254      $self->{STORAGEHANDLE} = DesignPattern::Object->fromPackage( $pkg, locator => $self->{locator} );
255      return 1;
256    
257  }  }
258    
259  sub addLogDispatchHandler {  sub addLogDispatchHandler {
# Line 175  sub addLogDispatchHandler { Line 285  sub addLogDispatchHandler {
285  }  }
286    
287  sub removeLogDispatchHandler {  sub removeLogDispatchHandler {
   
       my $self = shift;  
       my $name = shift;  
       #my $logger = shift;  
   
       $logger->remove($name);  
   
 }  
   
 sub getDbName {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   $dsn =~ m/database=(.+?);/;  
   my $database_name = $1;  
   return $database_name;  
 }  
   
 sub testDsn {  
288    my $self = shift;    my $self = shift;
289    my $dsn = $self->{locator}->{dbi}->{dsn};    my $name = shift;
290    my $result;    #my $logger = shift;
291    if ( my $dbh = DBI->connect($dsn, '', '', {    $logger->remove($name);
                                                       PrintError => 0,  
                                                       } ) ) {  
     $dbh->disconnect();  
     return 1;  
   } else {  
     $logger->error( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );  
   }  
292  }  }
293    
 sub createDb {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   
   $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;  
     
 }  
   
 sub dropDb {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   
   $logger->debug( __PACKAGE__ .  "->dropDb( 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("DROP DATABASE $database_name;")) {  
         $ok = 1;  
       }  
     }  
     $dbh->disconnect();  
   }  
     
   return $ok;  
 }  
   
 sub isConnected {  
   my $self = shift;  
   return 1 if $self->{STORAGEHANDLE};  
 }  
294    
 1;  
295    1;
296    __END__
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