Today we continue to discuss jigsaw.Efficient, low effort mashup isolation by James Mickens and Matthew Finifter. Mashups are web applications that contain code from different principals.
Jigsaw lets mashups be isolated with its framework and lets them selectively expose private state. We saw how Jigsaw improves the language and runtime for its purpose. Specifically we saw the public private access modifiers and visibility modifiers, that can be used for all variables and properties, cross box event listeners and scrubbing of private references, surrogate objects, predefined objects etc.
We saw that Jigsaw.getParentPrincipals () and getSameDomainPrincipals() allow a child to access it's parents resources and a parent to access it's children principal objects. Privileges are restricted down the hierarchy and this is strictly decreasing order. Privileges apply to network communication, visual fields and local storage such as DOM.
This we see that jigsaw has robust encapsulation tecniques for cross principal sharing. The execution context for the children are determined with the resource permissions and this is strictly dropping. All data is accessible by reference which is a performance gain.
#Google code jam - merlin QA
This is a problem about a quality assurance engineer in Merlin Inc who has to test N spells. Each spell takes a certain amount of material and converts it to another. There are M materials in all.She has no materials to begin with but she can take as much as she wants from the Merlin inventory. She gets to keep all the materials left behind from her tests. Each Material has a certain value so she wants to profit most by picking an order of the N spells to test that yields most.
Solution:
The naiive solution would be to permute the N spells and for each permutation determine the value of byproducts left behind. The one with the max value is the solution and the chosen order. Permutation of N spells is equivalent to the permit code below :
Jigsaw lets mashups be isolated with its framework and lets them selectively expose private state. We saw how Jigsaw improves the language and runtime for its purpose. Specifically we saw the public private access modifiers and visibility modifiers, that can be used for all variables and properties, cross box event listeners and scrubbing of private references, surrogate objects, predefined objects etc.
We saw that Jigsaw.getParentPrincipals () and getSameDomainPrincipals() allow a child to access it's parents resources and a parent to access it's children principal objects. Privileges are restricted down the hierarchy and this is strictly decreasing order. Privileges apply to network communication, visual fields and local storage such as DOM.
This we see that jigsaw has robust encapsulation tecniques for cross principal sharing. The execution context for the children are determined with the resource permissions and this is strictly dropping. All data is accessible by reference which is a performance gain.
#Google code jam - merlin QA
This is a problem about a quality assurance engineer in Merlin Inc who has to test N spells. Each spell takes a certain amount of material and converts it to another. There are M materials in all.She has no materials to begin with but she can take as much as she wants from the Merlin inventory. She gets to keep all the materials left behind from her tests. Each Material has a certain value so she wants to profit most by picking an order of the N spells to test that yields most.
Solution:
The naiive solution would be to permute the N spells and for each permutation determine the value of byproducts left behind. The one with the max value is the solution and the chosen order. Permutation of N spells is equivalent to the permit code below :
Permutations of a string:
Void Permute (String a, StringBuilder b, bool[] used)
{
If ( b.Length == a.Length) { print b.ToString(); return;}
For (int I = 0; I < a.Length ; i++)
{
If (used[i]) continue;
used[i] = true;
B += A[i];
Permute(a, b, used);
B [B.Length – 1] = ‘/0’;
used[i] = false;
}
}
As we list each order of the spells above, we find the value of the outcomes and pick the one with the maximum value.
As we list each order of the spells above, we find the value of the outcomes and pick the one with the maximum value.
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