Examples of com.mongodb.ReadPreference

com.mongodb.ReadPreference
An abstract class that represents preferred replica set members to which a query or command can be sent. @mongodb.driver.manual core/read-preference Read Preference


    if ( embeddingEntityDocument != null ) {
      return embeddingEntityDocument;
    }
    else {
      ReadPreference readPreference = getReadPreference( associationContext );


      DBCollection collection = getCollection( key.getEntityKey() );
      DBObject searchObject = prepareIdObject( key.getEntityKey() );
      DBObject projection = getProjection( key, true );

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      return collection.findOne( searchObject, projection, readPreference );
    }
  }


  private DBObject getObject(EntityKey key, TupleContext tupleContext) {
    ReadPreference readPreference = getReadPreference( tupleContext );


    DBCollection collection = getCollection( key );
    DBObject searchObject = prepareIdObject( key );
    BasicDBObject projection = getProjection( tupleContext );

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    return deleted != null;
  }


  //not for embedded
  private DBObject findAssociation(AssociationKey key, AssociationContext associationContext, AssociationStorageStrategy storageStrategy) {
    ReadPreference readPreference = getReadPreference( associationContext );
    final DBObject associationKeyObject = associationKeyToObject( key, storageStrategy );


    return getAssociationCollection( key, storageStrategy ).findOne( associationKeyObject, getProjection( key, false ), readPreference );
  }

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    private MongoBlob getBlob(String id, long lastMod) {
        DBObject query = getBlobQuery(id, lastMod);
        
        // try the secondary first
        // TODO add a configuration option for whether to try reading from secondary
        ReadPreference pref = ReadPreference.secondaryPreferred();
        DBObject fields = new BasicDBObject();
        fields.put(MongoBlob.KEY_DATA, 1);
        MongoBlob blob = (MongoBlob) getBlobCollection().findOne(query, fields, pref);
        if (blob == null) {
            // not found in the secondary: try the primary

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        lastReadWriteMode = readWriteMode;
        try {
            Map<String, String> map = Splitter.on(", ").withKeyValueSeparator(":").split(readWriteMode);
            String read = map.get("read");
            if (read != null) {
                ReadPreference readPref = ReadPreference.valueOf(read);
                if (!readPref.equals(nodes.getReadPreference())) {
                    nodes.setReadPreference(readPref);
                    LOG.info("Using ReadPreference " + readPref);
                }
            } 
            String write = map.get("write");

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        lastReadWriteMode = readWriteMode;        
        try {
            Map<String, String> map = Splitter.on(", ").withKeyValueSeparator(":").split(readWriteMode);
            String read = map.get("read");
            if (read != null) {
                ReadPreference readPref = ReadPreference.valueOf(read);
                if (!readPref.equals(this.readPreference)) {
                    this.readPreference = readPref;
                }
            } 
            String write = map.get("write");
            if (write != null) {

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  /**
   * Returns a {@link DBObject} representing the entity which embeds the specified association.
   */
  private DBObject getEmbeddingEntity(AssociationKey key, AssociationContext associationContext) {
    ReadPreference readPreference = getReadPreference( associationContext );


    DBCollection collection = getCollection( key.getEntityKey() );
    DBObject searchObject = prepareIdObject( key.getEntityKey() );
    DBObject projection = getProjection( key, true );

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    return collection.findOne( searchObject, projection, readPreference );
  }


  private DBObject getObject(EntityKey key, TupleContext tupleContext) {
    ReadPreference readPreference = getReadPreference( tupleContext );


    DBCollection collection = getCollection( key );
    DBObject searchObject = prepareIdObject( key );
    BasicDBObject projection = getProjection( tupleContext );

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    collection.remove( toDelete, writeConcern );
  }


  //not for embedded
  private DBObject findAssociation(AssociationKey key, AssociationContext associationContext, AssociationStorageStrategy storageStrategy) {
    ReadPreference readPreference = getReadPreference( associationContext );
    final DBObject associationKeyObject = associationKeyToObject( key, storageStrategy );


    return getAssociationCollection( key, storageStrategy ).findOne( associationKeyObject, getProjection( key, false ), readPreference );
  }

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        lastReadWriteMode = readWriteMode;        
        try {
            Map<String, String> map = Splitter.on(", ").withKeyValueSeparator(":").split(readWriteMode);
            String read = map.get("read");
            if (read != null) {
                ReadPreference readPref = ReadPreference.valueOf(read);
                if (!readPref.equals(this.readPreference)) {
                    this.readPreference = readPref;
                }
            } 
            String write = map.get("write");
            if (write != null) {

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