$ java -jar taq.jar scope-cycles
Running query first_time in global scope
indexes(phase=1, one 1, two 2, three 3, four 4, random=232)
indexes(phase=2, one 1, two 2, three 3, four 7, random=232)
Running query second_time in global scope
indexes(phase=1, one 1, two 2, three 3, four 4, random=436)
indexes(phase=2, one 1, two 2, three 3, four 7, random=436)scope-cycles.taq demonstrates how variables declared in a scope behave from one query to the next. There are 3 declared scopes named, in order, “one”, “two” and “three”. Each of these scopes plus the global scope have an integer variable named “index” with a chain of dependency starting with scope “one” depending on the global scope. The global scope also has a variable named “random” which is set to a pseudo-random number.
An “indexes” template is used to display all the index values, but with a twist. The global index comes last and has it’s value updated from 1 to 4. The phase 1 result of query “first_time” is as expected, showing the declared scopes are initialized in the order of occurrence.
The phase 2 result shows all but the “Four” value are unchanged atfer the previous template unifcation/evaluation cycle. Global values are unaffected by template cycles unless updated by the template.
The result of query “scond_time” is the same as the first , except for the random term. This shows the global index is reset to it’s initial default value of 1 at completion of the first query. The random number change from the first to second query result confirms the global values were reevaluated iat the start of the second query.