如何安全地关闭IndexReader？
我的问题很简单,当使用IndexReader.openIfChanged (reader)替换以前reader,如何安全关闭oldReader？
这是代码:(使用Lucene 3.5)
IndexReader newReader=IndexReader.openIfChanged(reader);
if(newReader!=null){
IndexReader oldReader=reader;
IndexSearcher oldSearcher=searcher;
reader=newReader;
searcher=new IndexSearcher(newReader);
oldSearcher.close();
oldReader.close();//or oldReader.decRef(),result is the same
}
这个代码在deamon线程中,每5秒运行一次
IndexReaderinstance(readerobject)是全局唯一的
自从这次改变以来,我得到一个例外:
org.apache.lucene.store.AlreadyClosedException: this IndexReader is closed
at org.apache.lucene.index.IndexReader.ensureOpen(IndexReader.java:297)
at org.apache.lucene.index.IndexReader.getSequentialSubReaders(IndexReader.java:1622)
at org.apache.lucene.search.TermQuery$TermWeight.scorer(TermQuery.java:98)
at org.apache.lucene.search.BooleanQuery$BooleanWeight.scorer(BooleanQuery.java:298)
at org.apache.lucene.search.BooleanQuery$BooleanWeight.scorer(BooleanQuery.java:298)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:577)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:517)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:487)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:400)
at org.zenofo.index.IndexManager.query(IndexManager.java:392)
...
IndexManager.java:392使用reader对象(IndexReader实例,全局唯一)
IndexManager.query方法有大量的并发请求,所有请求都使用全局唯一的IndexReader实例(reader对象)
我需要关闭oldReader只是因为:
参考:
我该如何解决这个问题？