Abstract: There is provided a pressure sensor, including a top cover assembly, an upper seat (120), and a movable membrane (200); each of a top and a bottom of the upper seat (120) is provided with an opening, the top cover assembly seals the opening at the top of the upper seat, and the movable membrane (200) seals the opening at the bottom of the upper seat (120); the top cover assembly, the upper seat (120), and the movable membrane (200) form a pressure reference chamber (100), and the pressure sensor detects a gas pressure on a side of the movable membrane (200) away from the top cover assembly based on a state of the movable membrane (200); at least one gas guide passage (510) is formed at the top cover assembly, and is configured to connect the pressure reference chamber (100) to the outside; the top cover assembly includes at least one blocking member (521) configured to seal the gas guide passage (510); and the blocking member (521) seals the gas guide passage (510) after being heated to a temperature higher t

Abstract: A system for retrieving and caching metadata from a remote data source is described. The system may receive a request from a client device. The request is to perform a query operation on a set of data objects stored in the remote data source. The system may access a metadata cache storing metadata information on one or more data objects of the remote data source and identify metadata corresponding to the set of data objects for the query operation in the metadata cache. The system may determine whether the identified metadata for the set of data objects meets an update condition. In response to the identified metadata meeting the update condition, the system may fetch updated metadata for at least the set of data objects from the remote data source, and store the updated metadata in the metadata cache.

Abstract: A system for retrieving and caching metadata from a remote data source is described. The system may receive a request from a client device. The request is to perform a query operation on a set of data objects stored in the remote data source. The system may access a metadata cache storing metadata information on one or more data objects of the remote data source and identify metadata corresponding to the set of data objects for the query operation in the metadata cache. The system may determine whether the identified metadata for the set of data objects meets an update condition. In response to the identified metadata meeting the update condition, the system may fetch updated metadata for at least the set of data objects from the remote data source, and store the updated metadata in the metadata cache.

Abstract: A system is provided comprising one or more application layer audit proxies arranged to obtain application layer network traffic sent in a network. Each of the application layer audit proxies configured to: receive application layer network traffic sent as part of a communication session between a producer entity and a consumer entity; record information about the application layer network traffic to an audit log in a distributed permissioned database comprising a blockchain of immutable data blocks; and forward the application layer network traffic to the producer entity or to the consumer entity.

Abstract: A system is provided comprising one or more application layer audit proxies arranged to obtain application layer network traffic sent in a network. Each of the application layer audit proxies configured to: receive application layer network traffic sent as part of a communication session between a producer entity and a consumer entity; record information about the application layer network traffic to an audit log in a distributed permissioned database comprising a blockchain of immutable data blocks; and forward the application layer network traffic to the producer entity or to the consumer entity.