CSC/ECE 517 Fall 2014/OSS M1450 vda

Implement Window.sessionStorage

This wiki page contains the implementation of Window.sessionStorage for the research project "Servo" developed by Mozilla using RUST programming language.

Introduction

Rust

Rust is a modern systems programming language focusing on safety and speed to build reliable and efficient systems <ref> http://doc.rust-lang.org/nightly/intro.html </ref>. It accomplishes the goals of memory safe without using garbage collection and it supports concurrency and parallelism in building platforms.

Rust’s lightweight task mechanism also promises to allow fine-grained isolation between browser components, such as tabs and extensions, without the need for expensive runtime protection schemes, like operating system process isolation. <ref> https://www.mozilla.org/en-US/research/projects/ </ref>

Servo

Mozilla Research team is currently working on an experimental project to develop a new Web browser engine "Servo", that is capable of supporting a variety of current and next generation of hardware like mobile devices, multi-core processors and high-performance GPUs. Servo builds on top of Rust to provide a secure and reliable foundation. It is currently developed on 64 bit devices.<ref> https://www.mozilla.org/en-US/research/projects/ </ref>

The main objectives of this experimentation project is improving the layout to graphics rendering - to optimize for power efficiency and maximize parallelism. <ref> https://www.mozilla.org/en-US/research/projects/ </ref>

Session Storage Implementation

Step 1

As a first step we need to build the servo browser engine. Visit Servo page and make sure you have completed the pre requisite step.

Then clone the servo browser using

git clone https://github.com/servo/servo

And in order to build the Servo browser, go to the servo directory and give the below command.

cd servo
./mach build

Note: Make sure Rust is installed before building Servo. Building the servo browser engine will take a considerable amount of time.

When the build is successful, you can test whether your browser is working perfectly by using htis command

./mach run tests/html/about-mozilla.html

SNAPSHOT OF SERVO BROWSER ENGINE

Step 2

Now, we have the servo browser engine in our machine. In order to implement Window.sessionStorage we need to add two files - an interface WEB IDL file and the implementation file

• Create a new file called Storage.webidl file under the specified folder components/script/dom/webidls. This file contains the basic information about the methods that will be used in the storage.rs file.

• Next, create another file called storage.rs file under the specified folder components/script/dom. This file contains the actual implementation of the sessionStorage. It has the basic methods for the creation of a storage object.

• Now we have to add our module to lib.rs file so that the build file knows that there is a new file that has been added.

• Build the servo once again and test to see if the servo browser is running perfectly.

FEW SNAPSHOTS

Design Patterns

We can use a delegation pattern here.

Future Implementations

Local Storage will be implemented in the future project.

References

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