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


    private URLConnection connection = null;
    
    private URLConnection getConnection() throws IOException {
      if (connection == null) {
      BrokerPool db = null;
      DBBroker broker = null;
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
        final Subject subject = broker.getSubject();
        
        final URL url = new URL("xmldb:exist://jsessionid:"+subject.getSessionId()+"@"+ uri.toString());
        connection = url.openConnection();
      } catch (final IllegalArgumentException e) {
        throw new IOException(e); 
      } catch (final MalformedURLException e) {
        throw new IOException(e); 
      } catch (final EXistException e) {
        throw new IOException(e); 
      } finally {
        if (db != null)
          {db.release(broker);}
      }
      }
      return connection;
    }

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  }


  public Collection getCollection() throws IOException {
    if (!initialized) {
        DBBroker broker = null; 
      BrokerPool db = null;


      try {
        try {
          db = BrokerPool.getInstance();
          broker = db.get(null);
        } catch (final EXistException e) {
          throw new IOException(e);
        }
  
        try {
          if (uri.endsWith("/")) {
            collection = broker.getCollection(uri);
          } else {
            collection = broker.getCollection(uri);
            if (collection == null)
              {collection = broker.getCollection(uri.removeLastSegment());}
          }
          if (collection == null)
            {throw new IOException("Collection not found: "+uri);}
          
          return collection;
        } catch (final Exception e) {
          throw new IOException(e);
        }
      } finally {
        if (db != null)
          {db.release(broker);}
      }
    }


    if (resource == null)
      {return collection;}

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    public String[] list() {
      
      if (isDirectory()) {
        
          DBBroker broker = null; 
        BrokerPool db = null;


        try {
          try {
            db = BrokerPool.getInstance();
            broker = db.get(null);
          } catch (final EXistException e) {
                  return new String[0];
          }


            final List<String> list = new ArrayList<String>();
          for (final CollectionEntry entry : collection.getEntries(broker)) {
            list.add(entry.getUri().lastSegment().toString());
          }
          
          return list.toArray(new String[list.size()]);


        } catch (final PermissionDeniedException e) {
              return new String[0];


      } finally {
              if (db != null)
                {db.release( broker );}
            }
      }
      
      return new String[0];
    }

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      if (collection == null)
        {return null;}
      
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return null;
      }
  
        try {
            collection.getLock().acquire(Lock.READ_LOCK);
  
            final File[] children = new File[collection.getChildCollectionCount(broker) + 
                                         collection.getDocumentCount(broker)];
              
              //collections
              int j = 0;
              for (final Iterator<XmldbURI> i = collection.collectionIterator(broker); i.hasNext(); j++)
                children[j] = new Resource(collection.getURI().append(i.next()));
  
              //collections
              final List<XmldbURI> allresources = new ArrayList<XmldbURI>();
              DocumentImpl doc = null;
              for (final Iterator<DocumentImpl> i = collection.iterator(broker); i.hasNext(); ) {
                  doc = i.next();
                  
                  // Include only when (1) locktoken is present or (2)
                  // locktoken indicates that it is not a null resource
                  final LockToken lock = doc.getMetadata().getLockToken();
                  if(lock==null || (!lock.isNullResource()) ){
                      allresources.add( doc.getURI() );
                  }
              }
              
              // Copy content of list into String array.
              for(final Iterator<XmldbURI> i = allresources.iterator(); i.hasNext(); j++){
                children[j] = new Resource(i.next());
              }
              
              return children;
          } catch (final LockException e) {
            //throw new IOException("Failed to acquire lock on collection '" + uri + "'");
          return null;
          
          } catch (final Exception e) {
            return null;
            
        } finally {
            collection.release(Lock.READ_LOCK);
        }
      
    } catch (final Exception e) {
      return null;
      
    } finally {
        if (db != null)
          {db.release(broker);}
      }
    }

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    } catch (final IOException e) {
      throw new FileNotFoundException(e.getMessage());
    }
    
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new FileNotFoundException(e.getMessage());
      }
  
      if (doc instanceof BinaryDocument) {
        return broker.getBinaryFile(((BinaryDocument)doc));
        
      } else {
        return serialize(broker, doc);
      }


    } catch (final Exception e) {
      throw new FileNotFoundException(e.getMessage());
      
    } finally {
        if (db != null)
          {db.release(broker);}
      }
//    throw new FileNotFoundException("unsupported operation for "+doc.getClass()+".");
  }

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    private void modifyMetadata(ModifyMetadata method) throws IOException {
//      if (initialized) {return;}
      
    DBBroker broker = null; 
    BrokerPool db = null;


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


            method.modify(collection);
            broker.saveCollection(txn, collection);
            
            tm.commit(txn);


          } else {
            collection = resource.getCollection();


            txn = tm.beginTransaction();
            
            method.modify(resource);
                  broker.storeMetadata(txn, resource);
            
            tm.commit(txn);
          }
        }
      } catch (final IOException e) {
        if (txn != null) {
          tm.abort(txn);
        }
        throw e;
      } catch (final Exception e) {
        if (txn != null) {
          tm.abort(txn);
        }
        throw new IOException(e);
      } finally {
                tm.close(txn);
        if (resource != null)
          {resource.getUpdateLock().release(Lock.READ_LOCK);}
      }
    } finally {
      if (db != null)
        {db.release(broker);}
    }
    
    initialized = true;
    }

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    @Override
    public final void execute(final JobExecutionContext jec) throws JobExecutionException {
        final JobDataMap jobDataMap = jec.getJobDetail().getJobDataMap();
        final BrokerPool pool = (BrokerPool)jobDataMap.get("brokerpool");
        final SystemTask task = ( SystemTask )jobDataMap.get("systemtask");


        //if invalid arguments then abort
        if((pool == null) || (task == null)) {


            //abort all triggers for this job
            final JobExecutionException jaa = new JobExecutionException("SystemTaskJob Failed: BrokerPool or SystemTask was null! Unscheduling SystemTask", false);
            jaa.setUnscheduleAllTriggers( true );
            throw jaa;
        }


        //trigger the system task
        pool.triggerSystemTask(task);
    }

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    @Override
    public final void execute(final JobExecutionContext jec) throws JobExecutionException {
        final JobDataMap jobDataMap = jec.getJobDetail().getJobDataMap();


        //get the brokerpool from the data map
        final BrokerPool pool = (BrokerPool)jobDataMap.get("brokerpool");


        //get any parameters from the data map
        final Map params = (Map)jobDataMap.get("params");


        try {

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  public DocumentImpl getDocument(String uuid) throws EXistException, PermissionDeniedException {
    MetasImpl ms = docByUUID.get(uuid);
    if (ms == null) return null;
    
    BrokerPool db = null;
    DBBroker broker = null;
    try {
      db = BrokerPool.getInstance();
      broker = db.get(null);
      
      XmldbURI uri = XmldbURI.create(ms.uri);
      Collection col = broker.getCollection(uri.removeLastSegment());
      if (col != null) {
        return col.getDocument(broker, uri.lastSegment());
      }
      
      return null;
    } finally {
      if (db != null)
        db.release(broker);
    }
  }

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  public Collection getCollection(String uuid) throws EXistException, PermissionDeniedException {
    MetasImpl ms = docByUUID.get(uuid);
    if (ms == null) return null;
    
    BrokerPool db = null;
    DBBroker broker = null;
    try {
      db = BrokerPool.getInstance();
      broker = db.get(null);
      
      XmldbURI uri = XmldbURI.create(ms.uri);
      return broker.getCollection(uri);
    } finally {
      if (db != null)
        db.release(broker);
    }
  }

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