Question

我从HDD上的形状文件创建geotools'SimpleFeatureCollection一次。然后我称它.features()方法很多次。到目前为止，我认为这是一个很好的做法，但似乎并非如此。在多次调用特征方法后，我收到了

Exception in thread "main" java.lang.Error: Maximum lock count exceeded
 at java.util.concurrent.locks.ReentrantReadWriteLock$Sync.fullTryAcquireShared(ReentrantReadWriteLock.java:528)
 at java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryAcquireShared(ReentrantReadWriteLock.java:488)
 at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)
 at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
 at org.geotools.data.shapefile.files.ShpFiles.acquireRead(ShpFiles.java:358)
 at org.geotools.data.shapefile.files.ShpFiles.getReadChannel(ShpFiles.java:789)
 at org.geotools.data.shapefile.shp.ShapefileReader.<init>(ShapefileReader.java:253)
 at org.geotools.data.shapefile.ShapefileSetManager.openShapeReader(ShapefileSetManager.java:51)
 at org.geotools.data.shapefile.ShapefileFeatureSource.getReaderInternal(ShapefileFeatureSource.java:263)
 at org.geotools.data.shapefile.ShapefileFeatureStore.getReaderInternal(ShapefileFeatureStore.java:124)
 at org.geotools.data.store.ContentFeatureSource.getReader(ContentFeatureSource.java:563)
 at org.geotools.data.store.ContentFeatureCollection.features(ContentFeatureCollection.java:165)

我怎样才能避免这种情况发生？这里有什么好的编码实践？在每次调用SimpleFeatureCollection方法之前，我是否应该使用shape文件创建.features()？任何见解将不胜感激。

Answer 1

当javadocs明确表示您必须在使用后关闭FeatureIterator，否则资源将耗尽或泄露。你需要使用这样的代码：

FeatureIterator i = featureCollection.features()
 try {
    while( i.hasNext() ){
        SimpleFeature feature = i.next();
    }
 }
 finally {
    i.close();
 }

多次调用geotools的SimpleFeatureCollection.features（）会导致“超出最大锁定数”

1 个答案: