public synchronized Address<? extends Node> getOrCreateNodeByRecipe(RecipeTraceInfo recipeTrace) {
final ReteNodeRecipe recipe = recipeTrace.getRecipe();
Address<? extends Node> result = getNodesByRecipe().get(recipe);
if (result != null) {
// NODE ALREADY CONSTRUCTED FOR RECIPE, only needs to add trace
if (getRecipeTraces().add(recipeTrace)) result.getNodeCache().assignTraceInfo(recipeTrace);
} else {
// No node for this recipe object - but equivalent recipes still reusable
Collection<ReteNodeRecipe> sameClassRecipes = getSameClassRecipes(recipe);
for (ReteNodeRecipe knownRecipe : sameClassRecipes) {
if (equivalentRecipes(recipe, knownRecipe)) {
// FOUND EQUIVALENT RECIPE
result = getNodesByRecipe().get(knownRecipe);
getNodesByRecipe().put(recipe, result);
result.getNodeCache().assignTraceInfo(recipeTrace);
break;
}
}
if (result == null) {
// MUST INSTANTIATE NEW NODE FOR RECIPE
final Node freshNode = instantiateNodeForRecipe(recipeTrace, recipe, sameClassRecipes);
result = reteContainer.makeAddress(freshNode);
}
}
return result;
}
private Node instantiateNodeForRecipe(
RecipeTraceInfo recipeTrace,
final ReteNodeRecipe recipe,
Collection<ReteNodeRecipe> sameClassRecipes) {
if (recipe instanceof IndexerRecipe) {
// INSTANTIATE AND HOOK UP
// (cannot delay hooking up, because parent determines indexer implementation)
ensureParents(recipeTrace);
final ReteNodeRecipe parentRecipe =
recipeTrace.getParentRecipeTraces().iterator().next().getRecipe();
final Indexer result =
nodeFactory.createIndexer(
reteContainer,
(IndexerRecipe) recipe,
asSupplier(
(Address<? extends Supplier>)
reteContainer.network.getExistingNodeByRecipe(parentRecipe)),
recipeTrace);
// REMEMBER
if (Options.nodeSharingOption != Options.NodeSharingOption.NEVER) {
getNodesByRecipe().put(recipe, reteContainer.makeAddress(result));
sameClassRecipes.add(recipe);
}
return result;
} else {
// INSTANTIATE
Node result = nodeFactory.createNode(reteContainer, recipe, recipeTrace);
// REMEMBER
if (Options.nodeSharingOption == Options.NodeSharingOption.ALL) {
getNodesByRecipe().put(recipe, reteContainer.makeAddress(result));
sameClassRecipes.add(recipe);
}
// HOOK UP
// (recursion-tolerant due to this delayed order of initialization)
ensureParents(recipeTrace);
if (recipe instanceof InputRecipe) inputConnector.connectInput((InputRecipe) recipe, result);
else connectionFactory.connectToParents(recipeTrace, result);
return result;
}
}
