this.configuration = configuration;
this.responseManager = new ResponseManagerImpl(configuration.getMaxQueueLength());
this.txnMan = new TransactionManagerImpl(configuration.getSyncMode().equals(SyncMode.ASYNC));
this.databaseManager = new DatabaseManagerImpl(this);
this.dbConfigFile = new DBConfig(this);
this.snapshotManager = new SnapshotManagerImpl(this);
this.dbCheckptr = new CheckpointerImpl(this);
}