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fix limit set, lazy iterator initialization

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This commit is contained in:
iMoHax
2015-07-17 15:31:25 +03:00
parent 345f05ba77
commit 3ff1593d4a
1 changed files with 18 additions and 9 deletions
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23
core/src/main/java/ru/trader/analysis/graph/Crawler.java
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@@ -261,7 +261,7 @@ public class Crawler<T> {
private int ucs2(CostTraversalEntry root, int deep, int count) {
LOG.trace("UCS2 from {} to {}, deep {}, count {}", root.vertex, target, deep, count);
int found = 0;
double limit = Double.MAX_VALUE;
double limit = Double.NaN;
LimitedQueue<CTEntrySupport> targetsQueue = new LimitedQueue<>(count, Comparator.<CTEntrySupport>naturalOrder());
LimitedQueue<CTEntrySupport> queue = new LimitedQueue<>(count, Comparator.<CTEntrySupport>naturalOrder());
root.sort();
@@ -286,7 +286,7 @@ public class Crawler<T> {
}
if (found >= count) break;
CTEntrySupport next = targetsQueue.peek();
limit = next != null ? next.entry.getWeight() : Double.MAX_VALUE;
limit = next != null ? next.entry.getWeight() : Double.NaN;
}
if (alreadyFound + found < count){
LOG.trace("Continue search, limit {}", limit);
@@ -308,7 +308,7 @@ public class Crawler<T> {
private class CTEntrySupport implements Comparable<CTEntrySupport>, Iterator<Edge<T>>{
private final CTEntrySupport parent;
private final Iterator<Edge<T>> iterator;
private Iterator<Edge<T>> iterator;
private final CostTraversalEntry entry;
private Edge<T> next;
@@ -318,10 +318,15 @@ public class Crawler<T> {
private CTEntrySupport(CTEntrySupport parent, CostTraversalEntry entry) {
this.parent = parent;
this.iterator = entry.iterator();
this.entry = entry;
}
private void checkIterator(){
if (iterator == null){
this.iterator = entry.iterator();
next = iterator.hasNext() ? next = iterator.next() : null;
}
}
@Override
public int compareTo(@NotNull CTEntrySupport o) {
@@ -344,11 +349,13 @@ public class Crawler<T> {
@Override
public boolean hasNext() {
checkIterator();
return next != null;
}
@Override
public Edge<T> next(){
checkIterator();
Edge<T> res = next;
next = iterator.hasNext() ? next = iterator.next() : null;
return res;
@@ -416,15 +423,17 @@ public class Crawler<T> {
boolean canDeep = !entry.getTarget().isSingle() && deep < entry.getTarget().getLevel() && entry.size() < maxSize-1;
if (canDeep || isTarget){
CostTraversalEntry nextEntry = travers(entry, edge);
if (canDeep){
nextEntry.sort();
}
curr = new CTEntrySupport(curr, nextEntry);
if (isTarget){
LOG.trace("Found, add entry {} to queue", nextEntry);
targets.add(curr);
limit = nextEntry.getWeight();
limit = Double.isNaN(limit) ? nextEntry.getWeight() : Math.min(limit, nextEntry.getWeight());
curr = curr.parent;
} else {
if (nextEntry.getWeight() >= limit && targets.size() > 0){
if (!Double.isNaN(limit) && nextEntry.getWeight() >= limit){
if (targets.size() < count){
LOG.trace("Not found, limit {}, add entry {} to queue", limit, nextEntry);
queue.add(curr);
@@ -479,7 +488,7 @@ public class Crawler<T> {
LOG.trace("Sub task is done");
targets.addAll(subTask.getTargets());
queue.addAll(subTask.getQueue());
limit = Math.min(limit, subTask.limit);
limit = Double.isNaN(limit) ? subTask.limit : Math.min(limit, subTask.limit);
}
@Override