public CommitOrderDependencyNode nodeFor(ClassDescriptor d) {
for (Enumeration e = nodes.elements(); e.hasMoreElements(); ) {
CommitOrderDependencyNode n = (CommitOrderDependencyNode) e.nextElement();
if (n.getDescriptor() == d) {
return n;
}
}
return null;
}
/**
* Calculate the commit order. Do a depth first search on the graph, skipping nodes that we have
* already visited or are in the process of visiting. Keep a counter and note when we first
* encounter a node and when we finish visiting it. Once we've visited everything, sort nodes by
* finishing time
*/
public void orderCommits() {
depthFirstSearch();
Object[] nodeArray = new Object[nodes.size()];
nodes.copyInto(nodeArray);
quicksort(nodeArray);
Vector result = new Vector(nodes.size());
for (int i = 0; i < nodes.size(); i++) {
CommitOrderDependencyNode node = (CommitOrderDependencyNode) nodeArray[i];
result.addElement(node.getDescriptor());
}
this.orderedDescriptors = result;
}
public void depthFirstSearch() {
/*
* Traverse the entire graph in breadth-first order. When finished, every node will have a
* predecessor which indicates the node that came before it in the search
* It will also have a discovery time (the value of the counter when we first saw it) and
* finishingTime (the value of the counter after we've visited all the adjacent nodes).
* See Cormen, Leiserson and Rivest, Section 23.3, page 477 for a full explanation of the algorithm
*/
// Setup
for (Enumeration e = getNodes().elements(); e.hasMoreElements(); ) {
CommitOrderDependencyNode node = (CommitOrderDependencyNode) e.nextElement();
node.markNotVisited();
node.setPredecessor(null);
}
currentTime = 0;
// Execution
for (Enumeration e = getNodes().elements(); e.hasMoreElements(); ) {
CommitOrderDependencyNode node = (CommitOrderDependencyNode) e.nextElement();
if (node.hasNotBeenVisited()) {
node.visit();
}
}
}
/** Add to each node the dependent nodes */
public void calculateSpecifiedDependencies() {
for (Enumeration e = nodes.elements(); e.hasMoreElements(); ) {
CommitOrderDependencyNode node = (CommitOrderDependencyNode) e.nextElement();
node.recordSpecifiedDependencies();
}
}
