returns the string value stored at the specified offset of the specified block . the method first obtains an slock on the block , then it calls the buffer to retrieve the value . concode_field_sep RecoveryMgr recoveryMgr concode_elem_sep BufferList myBuffers concode_elem_sep ConcurrencyMgr concurMgr concode_elem_sep int END_OF_FILE concode_elem_sep int txnum concode_elem_sep int nextTxNum concode_field_sep void rollback concode_elem_sep int getInt concode_elem_sep void setString concode_elem_sep void recover concode_elem_sep void pin concode_elem_sep int size concode_elem_sep void commit concode_elem_sep void unpin concode_elem_sep int nextTxNumber concode_elem_sep Block append concode_elem_sep void setInt