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double-check 中再取次httpClient的内容

master
shijinping 2013-11-28 14:38:30 +08:00
parent cb84220d7a
commit 9a524aa364
1 changed files with 1 additions and 0 deletions
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1
webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientDownloader.java
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@ -70,6 +70,7 @@ public class HttpClientDownloader implements Downloader {
CloseableHttpClient httpClient = httpClients.get(domain);
if (httpClient == null) {
synchronized (this) {
httpClient = httpClients.get(domain);
if (httpClient == null) {
httpClient = httpClientGenerator.getClient(site);
httpClients.put(domain, httpClient);