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

    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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  /**
   * 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(nodes.getReadPreference())) {
                    nodes.setReadPreference(readPref);
                    LOG.info("Using ReadPreference " + readPref);
                }
            }
            String write = map.get("write");

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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(this.readPreference)) {
                    this.readPreference = readPref;
                }
            }
            String write = map.get("write");
            if (write != null) {

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    @CheckForNull
    private <T extends Document> T findUncached(Collection<T> collection, String key, DocumentReadPreference docReadPref) {
        DBCollection dbCollection = getDBCollection(collection);
        long start = start();
        try {
            ReadPreference readPreference = getMongoReadPreference(collection, Utils.getParentId(key), docReadPref);


            if(readPreference.isSlaveOk()){
                LOG.trace("Routing call to secondary for fetching [{}]", key);
            }


            DBObject obj = dbCollection.findOne(getByKeyQuery(key).get(), null, null, readPreference);


            if (obj == null
                    && readPreference.isSlaveOk()) {
                //In case secondary read preference is used and node is not found
                //then check with primary again as it might happen that node document has not been
                //replicated. This is required for case like SplitDocument where the SplitDoc is fetched with
                //maxCacheAge == Integer.MAX_VALUE which results in readPreference of secondary.
                //In such a case we know that document with such an id must exist

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        String parentId = Utils.getParentIdFromLowerLimit(fromKey);
        TreeLock lock = acquireExclusive(parentId != null ? parentId : "");
        long start = start();
        try {
            DBCursor cursor = dbCollection.find(query).sort(BY_ID_ASC);
            ReadPreference readPreference =
                    getMongoReadPreference(collection, parentId, getDefaultReadPreference(collection));


            if(readPreference.isSlaveOk()){
                LOG.trace("Routing call to secondary for fetching children from [{}] to [{}]", fromKey, toKey);
            }


            cursor.setReadPreference(readPreference);

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                }


                //Default to primary preferred such that in case primary is being elected
                //we can still read from secondary
                //TODO REVIEW Would that be safe
                ReadPreference readPreference = ReadPreference.primaryPreferred();
                if (parentId != null) {
                    long replicationSafeLimit = getTime() - maxReplicationLagMillis;
                    NodeDocument cachedDoc = (NodeDocument) getIfCached(collection, parentId);
                    if (cachedDoc != null && !cachedDoc.hasBeenModifiedSince(replicationSafeLimit)) {

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