Deep copying objects in a collocated environment

• US 8,516,501 B2
• Filed: 08/11/2010
• Issued: 08/20/2013
• Est. Priority Date: 08/11/2010
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kalagananam, Aruna A., Inglis, Derek B., Sundaresan, Vijay
• Primary Examiner(s): NGUYEN, VAN H
• Application Number:
  US12/854,198
• Publication Number:
  US 20120042325A1
• Time in Patent Office: 1,105 Days
• Field of Search: 719/310, 719/316, 717/166
• US Class Current: 719/316
• CPC Class Codes: G06F 9/45504 Abstract machines for programme code execution, e.g. Java virtual machine [JVM], interpreters, emulators
• CPC Class Codes: G06F 9/547 Remote procedure calls [RPC]; Web services

Abstract

Systems and methods of passing arguments between client and server contexts may provide for detecting an in-process call between a client and a server, wherein the client and the server share a common virtual machine instance. An object copy from a source object of the in-process call to a destination object can be conducted based on an internal class structure of the virtual machine instance. The object copy procedure may be repeated for a plurality of source objects of the in-process call.

Claims

1. A computer program product comprising:

a non-transitory computer readable storage medium; and

computer usable code stored on the non-transitory computer readable storage medium, where, if executed by a processor, the computer usable code causes a computer to;

detect an in-process call between a client and a server, wherein the client and the server are to share a common virtual machine instance, and wherein the in-process call is to include a source object;

determine an internal class structure of the common virtual machine instance based on an object type of the source object;

conduct a field copy from the source object to a destination object based on field offset data, wherein the source object is to correspond to a first class loader and the destination object is to correspond to a second class loader;

repeat the field copy for a plurality of fields in the source object to complete an object copy of the source object; and

repeat the object copy for a plurality of source objects in the in-process call.

2. The computer program product of claim 1, wherein the computer usable code, if executed, further causes a computer to:

determine a first field offset for a field in the source object;

calculate a second field offset for the field in the destination object based on the field offset data; and

establish an association between the first field offset and the second field offset.

3. The computer program product of claim 1, wherein the field copy includes computer usable code which, if executed, further causes a computer to:

conduct a recursive deep copy from a field in the source object to the destination object if the field includes an object reference, wherein the deep copy is to include at least one of a use of preexisting copy of the object reference and a call of a Java™

-based helper function;

conduct a copy from a value of a field in the source object to the destination object if the field includes a primitive.

4. The computer program product of claim 1, wherein the computer usable code, if executed, further causes a computer to:

determine that the object type of the source object includes a system collection object;

define the destination object as a destination system collection object;

conduct a recursive deep copy from non-custom marshalled fields in the source object to the destination system collection object;

iterate through elements of the source object; and

conduct a recursive deep copy from each element of the source object to the destination system collection object.

5. The computer program product of claim 1, wherein the computer usable code, if executed, further causes a computer to:

identify at least one Java™

native interface (JNI) method in the computer usable code at a compile time;

change the JNI method to a compile time constant; and

use the compile time constant to identify the field offset data and conduct the field copy.

6. A computer program product comprising:

a non-transitory computer readable storage medium; and

computer usable code stored on the non-transitory computer readable storage medium, where, if executed by a processor, the computer usable code causes a computer to;

detect an in-process call between a client and a server, wherein the client and the server are to share a common virtual machine instance;

identify field offset data in an internal class structure;

conduct a field copy from the source object to the destination object based on the field offset data;

conduct an object copy from a source object of the in-process call to a destination object based on the internal class structure of the common virtual machine instance; and

repeat the object copy for a plurality of source objects in the in-process call.

7. The computer program product of claim 6, wherein the object copy includes computer usable code which, if executed, causes a computer to:

determine the internal class structure based on an object type of the source object; and

repeat the field copy for a plurality of fields in the source object.

8. The computer program product of claim 7, wherein the computer usable code, if executed, further causes a computer to:

determine a first field offset for a field in the source object;

calculate a second field offset for the field in the destination object based on the field offset data; and

establish an association between the first field offset and the second field offset.

9. The computer program product of claim 7, wherein the field copy includes computer usable code which, if executed, causes a computer to:

conduct a recursive deep copy from a field in the source object to the destination object if the field includes an object reference; and

conduct a copy from a value of a field in the source object to the destination object if the field includes a primitive.

10. The computer program product of claim 9, wherein the recursive deep copy includes computer usable code which, if executed, causes a computer to at least one of use a preexisting copy of the object reference and call a Java™

-based helper function.

11. The computer program product of claim 7, wherein the computer usable code, if executed, causes a computer to:

identify at least one Java™

native interface (JNI) method in the computer usable code at a compile time;

change the JNI method to a compile time constant; and

use the compile time constant to identify the field offset data and conduct the field copy.

12. The computer program product of claim 6, wherein the computer usable code, if executed, further causes a computer to:

determine that an object type of the source object includes a system collection object;

define the destination object as a destination system collection object;

conduct a recursive deep copy from non-custom marshalled fields in the source object to the destination system collection object;

iterate through elements of the source object; and

conduct a recursive deep copy from each element of the source object to the destination system collection object.

13. The computer program product of claim 6, wherein the source object is to correspond to a first class loader and the destination object is to correspond to a second class loader.