Questions from engineers:
a. Find the missing integer in a random length int[] array.
b. Minimize sets of batch email addresses sent to an API, preserving address ordering, do not include duplicates in a batch.
c. Define a login interface for a web app that works for a single server then multiple servers
d. Develop a pub/sub interface which suppresses duplicates and supports priority levels
e. Describe the architecture for a product on your resume explain how each part works in detail.

Question

Questions from engineers:
a. Find the missing integer in a random length int[] array.
b. Minimize sets of batch email addresses sent to an API, preserving address ordering, do not include duplicates in a batch.
c. Define a login interface for a web app that works for a single server then multiple servers
d. Develop a pub/sub interface which suppresses duplicates and supports priority levels
e. Describe the architecture for a product on your resume explain how each part works in detail.

Anonimo · Accepted Answer

a. lots of solutions, typical is probably Arrays.sort(), iterate through array until array[i] != (array[i+1]  + 1)

b. List> batches = new LinkedList>();
batches.add(new LinkedList());
outter: for (final String address : addresses)
	{
		for (final List batch : batches)
		{
			if (!batch.contains(address))
			{
				  batch.add(address);
				  continue outter;
			}
		}
		List newBatch = new LinkedList();
		newBatch.add(address);
		batches.add(newBatch);
	}

return batches;

c. Use form login or http authentication to identity a user, create a servlet session via cookie or url-rewriting.  For distributed nodes, save the servlet session using a container mechanism to a backing store (rdbms or nosql).  session state should have simple userid, login time, last activity time for aging logins.

d. Use Java Observer/Observable to implement basic pub-sub classes, define an enum for priority and do not notify if below the current notification level.  Keep notifications in a non-duplicating collection.

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