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load('jstests/concurrency/fsm_libs/fsm.js');
var composer = (function() {
function runCombinedFSM(workloads, configs, mixProb) {
// TODO: what if a workload depends on iterations?
var iterations = 100;
assert.eq(
AssertLevel.ALWAYS, globalAssertLevel, 'global assertion level is not set as ALWAYS');
var currentWorkload = getRandomElem(workloads, Random.rand());
var currentState = configs[currentWorkload].startState;
var myDB, collName;
var first = true;
workloads.forEach(function(workload) {
var args = configs[workload];
if (!first) {
assert.eq(myDB, args.db, 'expected all workloads to use same database');
assert.eq(collName, args.collName, 'expected all workloads to use same collection');
}
myDB = args.db;
collName = args.collName;
first = false;
if (workload !== currentWorkload) {
args.states[args.startState].call(args.data, myDB, collName);
}
});
// Runs an interleaving of the specified workloads
for (var i = 0; i < iterations; ++i) {
var args = configs[currentWorkload];
args.states[currentState].call(args.data, myDB, collName);
// Transition to another valid state of the current workload,
// with probability '1 - mixProb'
if (Random.rand() >= mixProb) {
var nextState =
fsm._getWeightedRandomChoice(args.transitions[currentState], Random.rand());
currentState = nextState;
continue;
}
// Transition to a state of another workload with probability 'mixProb'
var otherStates = [];
workloads.forEach(function(workload) {
if (workload === currentWorkload) {
return;
}
var args = configs[workload];
Object.keys(args.states)
.forEach(function(state) {
if (state !== args.startState) {
otherStates.push({workload: workload, state: state});
}
});
});
var next = getRandomElem(otherStates, Random.rand());
currentWorkload = next.workload;
currentState = next.state;
}
}
function getRandomElem(items, randVal) {
assert.gt(items.length, 0);
return items[Math.floor(randVal * items.length)];
}
return {
run: runCombinedFSM
};
})();
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