Method and system for controlling computer in system

A server computer communicably connected to a client computer, the server computer comprising:

• a processing request reception unit for receiving the series of processing requests transmitted from the client computer;
• a first execution environment and a second execution environment for executing a program performing information processing in accordance with the series of processing requests;
• a condition storage unit for storing a condition for judging whether a predetermined processing efficiency is assured for the information processing performed by the first execution environment according to the series of processing requests;
• a judgment unit for judging whether the predetermined processing efficiency is assured according to the condition;
• and
• a processing request allocation unit for temporarily suspending distribution of a predetermined processing request of the series of processing;
• allocating the predetermined processing request to the first execution environment when it is judged that the predetermined efficiency is assured with the first execution environment according to the condition;
• storing a session identifier identifying a series of sessions to which the processing request allocated to the first execution environment belongs therein;
• when the server computer judges that the predetermined processing efficiency cannot be assured with the first execution environment according to the condition, storing data inherited between the series of processing requests, in a storage area accessible from the first execution environment and the second execution environment, and judging whether the session identifier identifying the session to which the processing request received from the client is stored;
• and
• when the session identifier is stored, a preventing the predetermined processing request from being allocated to the second execution environment;
• and
• storing the predetermined processing request not allocated to the second execution environment, as a wait request, and
• when the session identifier identifying the session, to which the wait request belongs, is attached to a response from the first execution environment, allocating the wait request to the second execution environment.

An information processing system comprising a client computer and a server computer communicably connected to a client computer, the server computer comprises:

• a CPU and a memory;
• a processing request reception unit for receiving the series of processing requests transmitted from the client computer;
• a first execution environment and a second execution environment for executing a program performing information processing in accordance with the series of processing requests;
• a condition storage unit for storing a condition for judging whether a predetermined processing efficiency is assured for the information processing performed by the first execution environment according to the series of processing requests;
• a judgment unit for judging whether the predetermined processing efficiency is assured according to the condition;
• and
• a processing request allocation unit for temporarily suspending distribution of a predetermined processing request of the series of processing;
• allocating the predetermined processing request to the first execution environment when it is judged that the predetermined efficiency is assured with the first execution environment;
• storing a session identifier identifying a series of sessions to which the processing request allocated to the first execution environment belongs therein;
• and
• when the server computer judges that the predetermined processing efficiency cannot be assured with the first execution environment according to the condition, storing data inherited between the series of processing requests, in a storage area accessible from the first execution environment and the second execution environment, and judging whether the session identifier identifying the session to which the processing request received from the client is stored;
• and
• when the session identifier is stored, a preventing the predetermined processing request from being allocated to the second execution environment;
• and
• storing the predetermined processing request not allocated to the second execution environment, as a wait request, and
• when the session identifier identifying the session, to which the wait request belongs, is attached to a response from the first execution environment, allocating the wait request to the second execution environment.

A machine-readable storage medium, the machine-readable storage medium having stored thereon a series of instructions which when executed by a processing component cause a server computer, communicably connected to a client computer and having a first execution environment and a second execution environment for executing a program for performing information processing in accordance with a series of processing requests transmitted from the client computer, to execute:

• a step for storing a condition for judging whether a predetermined processing efficiency is assured for the information processing performed by the first execution environment according to the processing requests;
• a step for receiving the series of processing requests transmitted from the client computer;
• a step for judging whether the predetermined processing efficiency is assured according to the condition;
• a step for allocating a predetermined processing request to the first execution environment when it is judged that the predetermined efficiency is assured with the first execution environment according to the condition;
• a step for storing a session identifier identifying a series of sessions to which the processing request allocated to the first execution environment belongs therein;
• and
• when the server computer judges that the predetermined processing efficiency cannot be assured with the first execution environment, a step for storing data inherited between the series of processing requests according to the condition, in a storage area accessible from the first execution environment and the second execution environment, and a step for judging whether the session identifier identifying the session to which the processing request received from the client is stored;
• and
• when the session identifier is stored, a preventing the predetermined processing request from being allocated to the second execution environment;
• and
• a step for storing the predetermined processing request not allocated to the second execution environment, as a wait request, and
• when the session identifier identifying the session to which the wait request belongs is attached to a response from the first execution environment, a step for allocating the wait request to the second execution environment.