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

            String rwModeUri = readWriteMode;
            if(!readWriteMode.startsWith("mongodb://")){
                rwModeUri = String.format("mongodb://localhost/?%s", readWriteMode);
            }
            MongoClientURI uri = new MongoClientURI(rwModeUri);
            ReadPreference readPref = uri.getOptions().getReadPreference();


            if (!readPref.equals(nodes.getReadPreference())) {
                nodes.setReadPreference(readPref);
                LOG.info("Using ReadPreference {} ",readPref);
            }


            WriteConcern writeConcern = uri.getOptions().getWriteConcern();

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    }


    @Test
    public void testMongoReadPreferencesWithAge() throws Exception{
        //Change the default
        ReadPreference testPref = ReadPreference.secondary();
        mongoDS.getDBCollection(NODES).getDB().setReadPreference(testPref);


        NodeBuilder b1 = nodeStore.getRoot().builder();
        b1.child("x").child("y");
        nodeStore.merge(b1, EmptyHook.INSTANCE, CommitInfo.EMPTY);

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    if (database == null)
      throw new IOException("Database is not available");


    DBCollection dbCollection = database.getCollection(uri.segment(1));


    ReadPreference readPreference = (ReadPreference) options.get(Options.OPTION_READ_PREFERENCE);


    if (readPreference != null)
      dbCollection.setReadPreference(readPreference);


    return dbCollection;

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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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    protected <T extends Document> T findUncached(Collection<T> collection, String key, DocumentReadPreference docReadPref) {
        log("findUncached", key, 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).hint(hint);
            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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                    return ReadPreference.primary();
                }


                // read from primary unless parent has not been modified
                // within replication lag period
                ReadPreference readPreference = ReadPreference.primary();
                if (parentId != null) {
                    long replicationSafeLimit = getTime() - maxReplicationLagMillis;
                    NodeDocument cachedDoc = (NodeDocument) getIfCached(collection, parentId);
                    // FIXME: this is not quite accurate, because ancestors
                    // are updated in a background thread (_lastRev). We

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            String rwModeUri = readWriteMode;
            if(!readWriteMode.startsWith("mongodb://")){
                rwModeUri = String.format("mongodb://localhost/?%s", readWriteMode);
            }
            MongoClientURI uri = new MongoClientURI(rwModeUri);
            ReadPreference readPref = uri.getOptions().getReadPreference();


            if (!readPref.equals(nodes.getReadPreference())) {
                nodes.setReadPreference(readPref);
                LOG.info("Using ReadPreference {} ",readPref);
            }


            WriteConcern writeConcern = uri.getOptions().getWriteConcern();

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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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    }


    @Test
    public void testMongoReadPreferencesWithAge() throws Exception{
        //Change the default
        ReadPreference testPref = ReadPreference.secondary();
        mongoDS.getDBCollection(NODES).getDB().setReadPreference(testPref);


        NodeBuilder b1 = nodeStore.getRoot().builder();
        b1.child("x").child("y");
        nodeStore.merge(b1, EmptyHook.INSTANCE, CommitInfo.EMPTY);

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