Custom controller for the streaming API browser notifications page.

StreamingController.cls

public with sharing class StreamingController 
{
	public String getTopic()
	{
		String result='';
		
		List<PushTopic> topics=[select id, Name from PushTopic where Name='Cases'];
		if (0!=topics.size())
		{
			result='Cases';
		}
		
		return result;
	}
	
	public void CreateTopic()
	{
		System.debug('### Creating the push topic');
		PushTopic pushTopic=new PushTopic();
		pushTopic.Name='Cases';
		pushTopic.Query='SELECT Id, Subject, OwnerId ' +  
						'FROM Case ';
				
		pushTopic.ApiVersion=29.0;
		pushTopic.NotifyForOperationCreate = true;
		pushTopic.NotifyForOperationUpdate = true;
		pushTopic.NotifyForOperationUndelete = true;
		pushTopic.NotifyForOperationDelete = true;
		pushTopic.NotifyForFields = 'Referenced';
		insert pushTopic;
		System.debug('### Done creating the push topic - id = ' + pushTopic.Id);
	}
	
}