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#365 cache implementation

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This commit is contained in:
Christian Schuster 2015-05-26 23:33:29 +02:00 committed by Andreas Gudian
parent 59c791034c
commit d0c685f6b8
1 changed files with 12 additions and 3 deletions
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15
processor/src/main/java/org/mapstruct/ap/services/Services.java
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@ -18,7 +18,9 @@
*/
package org.mapstruct.ap.services;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.WeakHashMap;
import org.mapstruct.spi.AccessorNamingStrategy;
@ -29,21 +31,28 @@ import org.mapstruct.spi.AccessorNamingStrategy;
*/
public class Services {
private static final Map<Class<?>, Object> CACHE = new WeakHashMap<Class<?>, Object>();
private Services() {
}
/**
* Obtain an implementation of {@link AccessorNamingStrategy}. If no specialized implementation is found using
* {@link ServiceLoader}, a JavaBeans-compliant default implementation is returned.
* {@link ServiceLoader}, a JavaBeans-compliant default implementation is returned. The result is cached across
* invocations.
*
* @return The implementation of {@link AccessorNamingStrategy}.
* @throws IllegalStateException If more than one implementation is found by
* {@link ServiceLoader#load(Class, ClassLoader)}.
*/
public static AccessorNamingStrategy getAccessorNamingStrategy() {
AccessorNamingStrategy impl = get( AccessorNamingStrategy.class );
AccessorNamingStrategy impl = (AccessorNamingStrategy) CACHE.get( AccessorNamingStrategy.class );
if ( impl == null ) {
impl = new DefaultAccessorNamingStrategy();
impl = get( AccessorNamingStrategy.class );
if ( impl == null ) {
impl = new DefaultAccessorNamingStrategy();
}
CACHE.put( AccessorNamingStrategy.class, impl );
}
return impl;
}