International Business Machines Corporation

Berthold Martin Lebert

Ryan Andrew Sciampacone

Trent Gray-Donald

Sean Christopher Foley

Peter Duncan Shipton

John Duimovich

Kim Clohessy

Conventionally compiled byte code, such as that produced by compiling Java source code, contains calls to string buffer creation methods. The compiled byte code is processed by a machined that performs an optimizer tool. The optimizer tool refactors the compiled byte code to produce a modified byte code that is functionally equivalent to the compiled byte code with respect to string creation, but which creates fewer string buffer and character array objects to accomplish that string creation. The optimizer tool replaces a call to build a new string buffer object with a call to an existing string buffer object and code setting length of the existing string buffer object to zero and appending new string characters this existing string buffer object.

Memory use for string object creation

Continuous authentication of a user of a computing device is established to ensure security of the computing device. A smart pen fingerprint print reader identifies a user fingerprint and a determination is made to grant access to a computer device for this user. Communication with the computing device is accomplished through the smart pen. A security event is detected when the continuous user contact with the smart pen device is disrupted. In addition, user inactivity or exceeding a threshold distance between the smart pen device and the computing device may also trigger a security event. Detection of a security event will cause the screen content of the computing device to become unintelligible and the computing device becomes inoperable.

Smart pen system to restrict access to security sensitive devices while continuously authenticating the user

Optimizing compiled code includes finding a portion of the compiled code arising from method calls in a portion of source code that were not chained method calls. Modified code is produced for the portion of the compiled code, wherein the modified code conforms to compiled code that would have arisen from source code having chained calls equivalent to the method calls that were not chained in the portion of the source code.

Re-factor code to use method chaining with optimizer tool

A system, method and program product for optimizing compiled Java code to reduce file size. A system is provided that includes: a first optimization that removes unnecessary exception declarations in the compiled Java code; a second optimization that converts checked exception declarations to unchecked exception declarations in the compiled Java code; and a third optimization that removes exception lists in the compiled Java code.

Exception declaration refactoring to reduce memory footprint

A method, system, and program product for removing exception classes that match a pattern is disclosed. Exception classes are searched for those of the exception classes that match that pattern. The parent classes of matched exception classes are refactored to accept an exception type argument. Code that throws the matched exceptions is rewritten by replacing the exception class with the parent class and adding a corresponding exception type. Code that catches the thrown exceptions is rewritten by changing a catch clause to catch a parent exception class and inserting a case statement for the exception type in that catch clause. The matched exception classes are removed.

Refactor exception class hierarchy for reduced footprint and faster application start

A method for class isolation to minimize memory usage may include receiving a request for a requested class object from an application running on a device. The method may also include retrieving a class instance for the requested class object from a memory and determining if the class instance for the requested class object corresponds to an isolated system class; determining if the class instance for the requested class object corresponds to an application class in response to the class instance not corresponding to the isolated system class; determining that the class instance for the requested class object corresponds to a shared system class in response to the class instance not corresponding to the application class and the isolated system class; and obtaining a proxy class object for the shared system class in response to the class instance for the requested class object corresponding to the shared system class.

Class isolation to minimize memory usage in a device

A method, system and computer program product for optimizing an object-oriented program, which comprises identifying synthetic accessor methods added to the program during a compilation to allow access to the members of the inner classes and replacing the synthetic accessor methods with direct accesses to the members of the inner classes.

Optimizing an object-oriented program by transforming invocations of synthetic accessor methods

A computer implemented method, computer program product, and data processing system for reducing the number of inner classes in a compiled computer program written in an object-oriented programming language. An outer class of the compiled computer program is received, wherein the outer class contains an inner class, wherein the outer class comprises instructions to create an instance of an inner class. The instance is to be used as one of a callback, a listener command, a set of instructions by which an object instance of the inner class transfers information to the corresponding containing instance of the outer class, and combinations thereof. A transformation of the outer class is performed by moving methods of the inner class, as well as their contained instructions, into the outer class. The behavior of the compiled computer program remains unchanged.

Refractor inner class with object-oriented program optimizer tool for reduced footprint and faster application start

A runtime-resource management method, system, and product for managing resources available to application components in a portable device. The method, system, and product provide for loading one or more new application components into a portable device only if maximum runtime resources required by the one or more new application components are available in the portable device assuming loaded application components within the device are using the maximum runtime resources reserved by the loaded application components, reserving maximum runtime resources required by application components when application components are loaded into the portable device, and running loaded application components using only the runtime resources reserved for the loaded application components.

Growing community of inventors

Phoenix, AZ, United States of America

Berthold Martin Lebert