Examples of org.exist.storage.BrokerPool

org.exist.storage.BrokerPool
This class controls all available instances of the database. Use it to configure, start and stop database instances. You may have multiple instances defined, each using its own configuration. To define multiple instances, pass an identification string to {@link #configure(String,int,int,Configuration)}and use {@link #getInstance(String)} to retrieve an instance. @author Wolfgang Meier @author Pierrick Brihaye

        }
    }
    
    public boolean mkdir() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
          final Collection collection = broker.getCollection(uri.toCollectionPathURI());
          if (collection != null) {return true;}
  
          final Collection parent_collection = broker.getCollection(uri.toCollectionPathURI().removeLastSegment());
          if (parent_collection == null) {return false;}
  
          tm = db.getTransactionManager();
      final Txn transaction = tm.beginTransaction();
      
      try {
        final Collection child = broker.getOrCreateCollection(transaction, uri.toCollectionPathURI());
        broker.saveCollection(transaction, child);
        tm.commit(transaction);
      } catch (final Exception e) {
          tm.abort(transaction);
        return false;
      } finally {
                tm.close(transaction);
            }
        } catch (final Exception e) {
      return false;
      
    } finally {
      if (db != null)
        {db.release(broker);}
    }
      
      return true;
    }

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      return true;
    }


    public boolean mkdirs() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
          final Collection collection = broker.getCollection(uri.toCollectionPathURI());
          if (collection != null) {return true;}
  
      tm = db.getTransactionManager();
      final Txn transaction = tm.beginTransaction();
      
      try {
        final Collection child = broker.getOrCreateCollection(transaction, uri.toCollectionPathURI());
        broker.saveCollection(transaction, child);
        tm.commit(transaction);
      } catch (final Exception e) {
          tm.abort(transaction);
        return false;
      } finally {
                tm.close(transaction);
            }


    } catch (final Exception e) {
      return false;
    
    } finally {
      if (db != null)
        {db.release(broker);}
    }
      
      return true;
    }

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    public boolean _renameTo(File dest) {
      final XmldbURI destinationPath = ((Resource)dest).uri;


      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
      tm = db.getTransactionManager();
      Txn transaction = null;
  
          org.exist.collections.Collection destination = null;
          org.exist.collections.Collection source = null;
          XmldbURI newName;
      try {
           source = broker.openCollection(uri.removeLastSegment(), Lock.WRITE_LOCK);
          if(source == null) {
            return false;
              }
          final DocumentImpl doc = source.getDocument(broker, uri.lastSegment());
              if(doc == null) {
                  return false;
              }
              destination = broker.openCollection(destinationPath.removeLastSegment(), Lock.WRITE_LOCK);
              if(destination == null) {
                  return false;
              }
              
              newName = destinationPath.lastSegment();
  
              transaction = tm.beginTransaction();
              broker.moveResource(transaction, doc, destination, newName);
              tm.commit(transaction);
              return true;
              
          } catch ( final Exception e ) {
            e.printStackTrace();
            if (transaction != null) {tm.abort(transaction);}
            return false;
          } finally {
                tm.close(transaction);
            if(source != null) {source.release(Lock.WRITE_LOCK);}
            if(destination != null) {destination.release(Lock.WRITE_LOCK);}
          }
        } finally {
          if (db != null)
            {db.release( broker );}
        }
    }

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//      System.out.println("rename from "+uri+" to "+dest.getPath());
      
        final XmldbURI destinationPath = ((Resource)dest).uri;


        DBBroker broker = null; 
        BrokerPool db = null;
        TransactionManager tm;


        try {
            try {
                db = BrokerPool.getInstance();
                broker = db.get(null);
            } catch (final EXistException e) {
                return false;
            }
    
            tm = db.getTransactionManager();
            Txn transaction = null;
    
            org.exist.collections.Collection destination = null;
            org.exist.collections.Collection source = null;
            XmldbURI newName;
            try {
                source = broker.openCollection(uri.removeLastSegment(), Lock.WRITE_LOCK);
                if(source == null) {
                    return false;
                }
                final DocumentImpl doc = source.getDocument(broker, uri.lastSegment());
                if(doc == null) {
                    return false;
                }
                destination = broker.openCollection(destinationPath.removeLastSegment(), Lock.WRITE_LOCK);
                if(destination == null) {
                    return false;
                }
                
                newName = destinationPath.lastSegment();
    
                transaction = tm.beginTransaction();
                moveResource(broker, transaction, doc, source, destination, newName);


//                resource = null;
//                collection = null;
//                initialized = false;
//                uri = ((Resource)dest).uri;


                tm.commit(transaction);
                return true;
                
            } catch ( final Exception e ) {
                e.printStackTrace();
                if (transaction != null) {tm.abort(transaction);}
                return false;
            } finally {
                tm.close(transaction);
                if(source != null) {source.release(Lock.WRITE_LOCK);}
                if(destination != null) {destination.release(Lock.WRITE_LOCK);}
            }
        } finally {
            if (db != null)
                {db.release( broker );}
        }
    }

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    protected synchronized void uploadTmpFile() throws IOException {
      if (file == null)
        {throw new IOException();}
      
        DBBroker broker = null; 
        BrokerPool db = null;
        TransactionManager tm = null;
        Txn txn = null;


        try {
            try {
                db = BrokerPool.getInstance();
                broker = db.get(null);
            } catch (final EXistException e) {
                throw new IOException(e);
            }
    
            tm = db.getTransactionManager();
            txn = tm.beginTransaction();


            FileInputSource is = new FileInputSource(file);
          
            final IndexInfo info = collection.validateXMLResource(txn, broker, uri.lastSegment(), is);
//          info.getDocument().getMetadata().setMimeType(mimeType.getName());
  
          is = new FileInputSource(file);
          collection.store(txn, broker, info, is, false);


            tm.commit(txn);
            
        } catch ( final Exception e ) {
            e.printStackTrace();
            if (txn != null) {tm.abort(txn);}
      } finally {
            tm.close(txn);
          if (db != null)
              {db.release( broker );}
      }
    }

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        }
    }
    
    public boolean delete() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
      tm = db.getTransactionManager();
          Txn txn = null;
          try {
              collection = broker.openCollection(uri.removeLastSegment(), Lock.NO_LOCK);
              if (collection == null) {
                  return false;
              }
              // keep the write lock in the transaction
              //transaction.registerLock(collection.getLock(), Lock.WRITE_LOCK);
  
              final DocumentImpl doc = collection.getDocument(broker, uri.lastSegment());
              if (doc == null) {
                return true;
              }
              
              txn = tm.beginTransaction();
              if(doc.getResourceType() == DocumentImpl.BINARY_FILE)
                  {collection.removeBinaryResource(txn, broker, doc);}
              else
                  {collection.removeXMLResource(txn, broker, uri.lastSegment());}
              
              tm.commit(txn);
              return true;
  
          } catch (final Exception e) {
            if (txn != null) {tm.abort(txn);}
              return false;
          } finally {
                tm.close(txn);
            }
        } finally {
          if (db != null)
            {db.release(broker);}


            resource = null;
            collection = null;
            initialized = false;
        }

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        }
    }


    public boolean createNewFile() throws IOException {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new IOException(e);
      }
      
//      if (!uri.startsWith("/db"))
//        uri = XmldbURI.DB.append(uri);
//  
      try {
        if (uri.endsWith("/"))
          {throw new IOException("It collection, but should be resource: "+uri);}
      } catch (final Exception e) {
        throw new IOException(e);
      }
      
      final XmldbURI collectionURI = uri.removeLastSegment();
      collection = broker.getCollection(collectionURI);
      if (collection == null)
        {throw new IOException("Collection not found: "+collectionURI);}
      
      final XmldbURI fileName = uri.lastSegment();
  
//      try {
//        resource = broker.getXMLResource(uri, Lock.READ_LOCK);
//      } catch (final PermissionDeniedException e1) {
//      } finally {
//        if (resource != null) {
//          resource.getUpdateLock().release(Lock.READ_LOCK);
//          collection = resource.getCollection();
//          initialized = true;
//          
//          return false;
//        }
//      }
//      
      try {
        resource = broker.getResource(uri, Lock.READ_LOCK);
      } catch (final PermissionDeniedException e1) {
      } finally {
        if (resource != null) {
          resource.getUpdateLock().release(Lock.READ_LOCK);
          collection = resource.getCollection();
          initialized = true;
          
          return false;
        }
      }


      MimeType mimeType = MimeTable.getInstance().getContentTypeFor(fileName);
  
      if (mimeType == null) {
        mimeType = MimeType.BINARY_TYPE;
      }
      
      tm = db.getTransactionManager();
      final Txn transaction = tm.beginTransaction();
  
      InputStream is = null;
      try {
        if (mimeType.isXMLType()) {
          // store as xml resource
          final String str = "<empty/>"; 
          final IndexInfo info = collection.validateXMLResource(transaction, broker, fileName, str);
          info.getDocument().getMetadata().setMimeType(mimeType.getName());
          info.getDocument().getPermissions().setMode(DEFAULT_RESOURCE_PERM);
          collection.store(transaction, broker, info, str, false);
  
        } else {
          // store as binary resource
          is = new ByteArrayInputStream("".getBytes(UTF_8));
          
          final BinaryDocument blob = new BinaryDocument(db, collection, fileName);
  
          blob.getPermissions().setMode(DEFAULT_RESOURCE_PERM);


          collection.addBinaryResource(transaction, broker, blob, is,
              mimeType.getName(), 0L , new Date(), new Date());
  
        }
        tm.commit(transaction);
      } catch (final Exception e) {
        tm.abort(transaction);
        throw new IOException(e);
      } finally {
                tm.close(transaction);
        closeFile(is);
  
        if (resource != null)
          {resource.getUpdateLock().release(Lock.READ_LOCK);}
      }
      
    } catch (final Exception e) {
      return false;
      
    } finally {
      if (db != null)
        {db.release(broker);}
    }
    
    return true;
    }

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        //TODO why are these values not used from the class members?
        final String xqueryresource = (String)jobDataMap.get("xqueryresource");
        final Subject user = (Subject)jobDataMap.get("user");
        
        final BrokerPool pool = (BrokerPool)jobDataMap.get("brokerpool");
        final Properties params = (Properties)jobDataMap.get("params");
        final boolean unschedule = ((Boolean)jobDataMap.get("unschedule")).booleanValue();


        //if invalid arguments then abort
        if((pool == null) || (xqueryresource == null) || (user == null)) {
            abort("BrokerPool or XQueryResource or User was null!");
        }


        DBBroker broker = null;
        DocumentImpl resource = null;
        Source source = null;
        XQueryPool xqPool  = null;
        CompiledXQuery compiled = null;
        XQueryContext context = null;


        try {


            //get the xquery
            broker = pool.get(user);


            if(xqueryresource.indexOf(':') > 0) {
                source = SourceFactory.getSource(broker, "", xqueryresource, true);
            } else {
                final XmldbURI pathUri = XmldbURI.create(xqueryresource);
                resource = broker.getXMLResource(pathUri, Lock.READ_LOCK);


                if(resource != null) {
                    source = new DBSource(broker, (BinaryDocument)resource, true);
                }
            }


            if(source != null) {


                //execute the xquery
                final XQuery xquery = broker.getXQueryService();
                xqPool = xquery.getXQueryPool();


                //try and get a pre-compiled query from the pool
                compiled = xqPool.borrowCompiledXQuery(broker, source);


                if(compiled == null) {
                    context = xquery.newContext(AccessContext.REST); //TODO should probably have its own AccessContext.SCHEDULER
                } else {
                    context = compiled.getContext();
                }


                //TODO: don't hardcode this?
                if(resource != null) {
                    context.setModuleLoadPath(XmldbURI.EMBEDDED_SERVER_URI.append(resource.getCollection().getURI()).toString());
                    context.setStaticallyKnownDocuments(new XmldbURI[] {
                        resource.getCollection().getURI()
                    });
                }


                if(compiled == null) {


                    try {
                        compiled = xquery.compile(context, source);
                    }
                    catch(final IOException e) {
                        abort("Failed to read query from " + xqueryresource);
                    }
                }


                //declare any parameters as external variables
                if(params != null) {
                    String bindingPrefix = params.getProperty("bindingPrefix");


                    if(bindingPrefix == null) {
                        bindingPrefix = "local";
                    }
                    


                    for(final Entry param : params.entrySet()) {
                        final String key = (String)param.getKey();
                        final String value = (String)param.getValue();
                        context.declareVariable( bindingPrefix + ":" + key, new StringValue(value));
                    }
                }


                xquery.execute(compiled, null);


            } else {
                LOG.warn("XQuery User Job not found: " + xqueryresource + ", job not scheduled");
            }
        } catch(final EXistException ee) {
            abort("Could not get DBBroker!");
        } catch(final PermissionDeniedException pde) {
            abort("Permission denied for the scheduling user: " + user.getName() + "!");
        } catch(final XPathException xpe) {
            abort("XPathException in the Job: " + xpe.getMessage() + "!", unschedule);
        } catch(final MalformedURLException e) {
            abort("Could not load XQuery: " + e.getMessage());
        } catch(final IOException e) {
            abort("Could not load XQuery: " + e.getMessage());
        } finally {


            if(context != null) {
                context.runCleanupTasks();
            }
            
            //return the compiled query to the pool
            if(xqPool != null && source != null && compiled != null) {
                xqPool.returnCompiledXQuery(source, compiled);
            }


            //release the lock on the xquery resource
            if(resource != null) {
                resource.getUpdateLock().release(Lock.READ_LOCK);
            }


            // Release the DBBroker
            if(pool != null && broker != null) {
                pool.release(broker);
            }
        }


    }

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        resource = null;
        initialized = false;
    }
      
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new IOException(e);
      }
  
      try {
        //collection
        if (uri.endsWith("/")) {
          collection = broker.getCollection(uri);
          if (collection == null)
            {throw new IOException("Resource not found: "+uri);}
          
        //resource
        } else {
          resource = broker.getXMLResource(uri, Lock.READ_LOCK);
          if (resource == null) {
            //may be, it's collection ... checking ...
            collection = broker.getCollection(uri);
            if (collection == null) {
              throw new IOException("Resource not found: "+uri);
            }
          } else {
            collection = resource.getCollection();
          }
        }
      } catch (final IOException e) {
        throw e;
      } catch (final Exception e) {
        throw new IOException(e);
      } finally {
        if (resource != null)
          {resource.getUpdateLock().release(Lock.READ_LOCK);}
      }
    } finally {
      if (db != null)
        {db.release(broker);}
    }
    
    initialized = true;
    }

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      throw new IOException("this never should happen");
    }
    
    private Subject getBrokerUser() throws IOException {
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      db = BrokerPool.getInstance();
      broker = db.get(null);
      
      return broker.getSubject();
    } catch (final EXistException e) {
      throw new IOException(e);
    } finally {
      if (db != null)
        {db.release(broker);}
    }
    }

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