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add null check #104

master
yihua.huang 2014-04-16 19:46:32 +08:00
parent 42bbe40a37
commit f39aa435cf
1 changed files with 5 additions and 3 deletions
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8
webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
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@ -187,9 +187,11 @@ public class Spider implements Runnable, Task {
checkIfRunning();
Scheduler oldScheduler = this.scheduler;
this.scheduler = scheduler;
Request request;
while ((request = oldScheduler.poll(this)) != null) {
this.scheduler.push(request, this);
if (oldScheduler != null) {
Request request;
while ((request = oldScheduler.poll(this)) != null) {
this.scheduler.push(request, this);
}
}
return this;
}