Apparatus and methods for caching objects using main memory and persistent memory

In a computer system having main memory and persistent memory, the main memory containing at least one data buffer, the method comprising the steps of:

• receiving a request for an object, the request comprising an identifier of the object;
• and
• based on the identifier determining whether a cached copy of the object is stored in a plurality of data structures, the data structures comprising:
• a cyclic index buffer capable of storing index entries comprising an index, the index having a beginning;
• a cyclic object buffer capable of storing and retrieving objects by logical block number, the object buffer having a beginning;
• and
• a metadata buffer capable of storing information about the index buffer and the object buffer.

Apparatus having main memory and persistent memory, the main memory containing at least one data buffer, the apparatus having an execution unit capable of executing program code, and the apparatus comprising:

• a receiver for receiving an object from an origin server;
• and
• an object writer for storing the object in a plurality of data structures, the data structures comprising:
• a cyclic index buffer capable of storing index entries comprising an index, the index having a beginning;
• a cyclic object buffer capable of storing and retrieving objects by logical block number, the object buffer having a beginning;
• and
• a metadata buffer capable of storing information about the index buffer and the object buffer.

A computer system having main memory and persistent memory, the main memory containing at least one data buffer, the computer system having an execution unit capable of executing program code, and the computer system comprising:

• a receiver for receiving a request for an object, the request comprising an identifier of the object;
• and
• a determiner for determining whether a cached copy of the object is stored in a plurality of data structures, based on the identifier, the data structures comprising:
• a cyclic index buffer capable of storing index entries comprising an index, the index having a beginning;
• a cyclic object buffer capable of storing and retrieving objects by logical block number, the object buffer having a beginning;
• and
• a metadata buffer capable of storing information about the index buffer and the object buffer.

A computer-readable medium capable of causing a computer system to perform a method, the computer system having main memory and persistent memory, the main memory containing at least one data buffer, and the method comprising the steps of:

• receiving an object from an origin server;
• and
• storing the object in a plurality of data structures, the data structures comprising:
• a cyclic index buffer capable of storing index entries comprising an index, the index having a beginning;
• a cyclic object buffer capable of storing and retrieving objects by logical block number, the object buffer having a beginning;
• and
• a metadata buffer capable of storing information about the index buffer and the object buffer.

A computer-readable medium capable of causing a computer system to perform a method, the computer system having main memory and persistent memory, the main memory containing at least one data buffer, and the method comprising the steps of:

• receiving a request for an object, the request comprising an identifier of the object;
• and
• based on the identifier, determining whether a cached copy of the object is stored in a plurality of data structures, the data structures comprising:
• a cyclic index buffer capable of storing index entries comprising an index, the index having a beginning;
• a cyclic object buffer capable of storing and retrieving objects by logical block number, the object buffer having a beginning;
• and
• a metadata buffer capable of storing information about the index buffer and the object buffer.