Example

MongoClientSettingsSpec.groovy

        MongoClientSettings expected = MongoClientSettings.builder()
            .applyToClusterSettings(new Block<ClusterSettings.Builder>() {
            @Override
            void apply(final ClusterSettings.Builder builder) {
                builder.hosts([new ServerAddress('host1', 1), new ServerAddress('host2', 2)])
                        .mode(ClusterConnectionMode.MULTIPLE)
                        .requiredReplicaSetName('test')
                        .serverSelectionTimeout(25000, TimeUnit.MILLISECONDS)
                        .maxWaitQueueSize(10 * 7) // maxPoolSize * waitQueueMultiple
                        .localThreshold(30, TimeUnit.MILLISECONDS)
            }
        })
            .applyToConnectionPoolSettings(new Block<ConnectionPoolSettings.Builder>() {
            @Override
            void apply(final ConnectionPoolSettings.Builder builder) {
                builder.minSize(5)
                        .maxSize(10)
                        .maxWaitQueueSize(10 * 7) // maxPoolSize * waitQueueMultiple
                        .maxWaitTime(150, TimeUnit.MILLISECONDS)
                        .maxConnectionLifeTime(300, TimeUnit.MILLISECONDS)
                        .maxConnectionIdleTime(200, TimeUnit.MILLISECONDS)
            }
        })
            .applyToServerSettings(new Block<ServerSettings.Builder>() {
            @Override
            void apply(final ServerSettings.Builder builder) {
                builder.heartbeatFrequency(20000, TimeUnit.MILLISECONDS)
            }
        })
            .applyToSocketSettings(new Block<SocketSettings.Builder>() {
            @Override
            void apply(final SocketSettings.Builder builder) {
                builder.connectTimeout(2500, TimeUnit.MILLISECONDS)
                        .readTimeout(5500, TimeUnit.MILLISECONDS)
            }
        })
            .applyToSslSettings(new Block<SslSettings.Builder>() {
            @Override
            void apply(final SslSettings.Builder builder) {
                builder.enabled(true)
                        .invalidHostNameAllowed(true)
            }
        })
            .readConcern(ReadConcern.MAJORITY)
            .readPreference(ReadPreference.secondary())
            .writeConcern(WriteConcern.MAJORITY.withWTimeout(2500, TimeUnit.MILLISECONDS))
            .applicationName('MyApp')
            .credential(MongoCredential.createScramSha1Credential('user', 'test', 'pass'.toCharArray()))
            .compressorList([MongoCompressor.createZlibCompressor().withProperty(MongoCompressor.LEVEL, 5)])
            .retryWrites(true)
            .build()