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added limit for parsed SQL cache to NamedParameterJdbcTemplate (SPR-7237); added configurable cache limit to CachingMetadataReaderFactory

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This commit is contained in:
Juergen Hoeller
2010-05-26 19:35:06 +00:00
parent b4af04ba9d
commit 2136b04b65
2 changed files with 68 additions and 19 deletions
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44
org.springframework.core/src/main/java/org/springframework/core/type/classreading/CachingMetadataReaderFactory.java
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@@ -34,9 +34,19 @@ import org.springframework.core.io.ResourceLoader;
*/
public class CachingMetadataReaderFactory extends SimpleMetadataReaderFactory {
private static final int MAX_ENTRIES = 256;
/** Default maximum number of entries for the MetadataReader cache: 256 */
public static final int DEFAULT_CACHE_LIMIT = 256;
private final Map<Resource, MetadataReader> classReaderCache = createLRUCache();
private volatile int cacheLimit = DEFAULT_CACHE_LIMIT;
private final Map<Resource, MetadataReader> classReaderCache =
new LinkedHashMap<Resource, MetadataReader>(DEFAULT_CACHE_LIMIT, 0.75f, true) {
@Override
protected boolean removeEldestEntry(Map.Entry<Resource, MetadataReader> eldest) {
return size() > getCacheLimit();
}
};
/**
@@ -64,8 +74,27 @@ public class CachingMetadataReaderFactory extends SimpleMetadataReaderFactory {
}
/**
* Specify the maximum number of entries for the MetadataReader cache.
* Default is 256.
*/
public void setCacheLimit(int cacheLimit) {
this.cacheLimit = cacheLimit;
}
/**
* Return the maximum number of entries for the MetadataReader cache.
*/
public int getCacheLimit() {
return this.cacheLimit;
}
@Override
public MetadataReader getMetadataReader(Resource resource) throws IOException {
if (getCacheLimit() <= 0) {
return super.getMetadataReader(resource);
}
synchronized (this.classReaderCache) {
MetadataReader metadataReader = this.classReaderCache.get(resource);
if (metadataReader == null) {
@@ -76,15 +105,4 @@ public class CachingMetadataReaderFactory extends SimpleMetadataReaderFactory {
}
}
@SuppressWarnings("serial")
private static <K, V> Map<K, V> createLRUCache() {
return new LinkedHashMap<K, V>(MAX_ENTRIES, 0.75f, true) {
@Override
protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
return size() > MAX_ENTRIES;
}
};
}
}