com.justz.lock.interceptor.AnnotationLockConfigSource Maven / Gradle / Ivy
package com.justz.lock.interceptor;
import com.justz.lock.annotation.LockAnnotationParser;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Implementation of the {@link LockConfigSource} interface for working with lock metadata in annotation format.
*/
public class AnnotationLockConfigSource extends AbstractFallbackLockConfigSource implements Serializable {
private final Set annotationParsers;
public AnnotationLockConfigSource() {
this.annotationParsers = new LinkedHashSet<>(1);
this.annotationParsers.add(new SpringLockAnnotationParser());
}
@Override
protected Collection findLockConfig(final Method method) {
return determineCacheOperations(new LockOperationConfigProvider() {
@Override
public Collection getLockOperationConfigs(LockAnnotationParser parser) {
return parser.parseLockAnnotations(method);
}
});
}
@Override
protected Collection findLockConfig(final Class clazz) {
return determineCacheOperations(new LockOperationConfigProvider() {
@Override
public Collection getLockOperationConfigs(LockAnnotationParser parser) {
return parser.parseLockAnnotations(clazz);
}
});
}
/**
* Determine the lock operation(s) for the given {@link LockOperationConfigProvider}.
* This implementation delegates to configured
* {@link LockOperationConfigProvider}s for parsing known annotations into
* metadata attribute class.
*
Can be overridden to support custom annotations that carry
* lock metadata.
* @param provider the lock operation provider to use
* @return the configured lock operations, or {@code null} if none found
*/
protected Collection determineCacheOperations(LockOperationConfigProvider provider) {
Collection cfgs = null;
for (LockAnnotationParser annotationParser : this.annotationParsers) {
Collection annCfgs = provider.getLockOperationConfigs(annotationParser);
if (annCfgs != null) {
if (cfgs == null) {
cfgs = new ArrayList();
}
cfgs.addAll(annCfgs);
}
}
return cfgs;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof AnnotationLockConfigSource)) {
return false;
}
AnnotationLockConfigSource otherCos = (AnnotationLockConfigSource) other;
return this.annotationParsers.equals(otherCos.annotationParsers);
}
@Override
public int hashCode() {
return this.annotationParsers.hashCode();
}
/**
* Callback interface providing {@link LockOperationConfig} instance(s) based on
* a given {@link LockAnnotationParser}.
*/
protected interface LockOperationConfigProvider {
/**
* Return the {@link LockOperationConfig} instance(s) provided by the specified parser.
* @param parser the parser to use
* @return the lock configs, or {@code null} if none found
*/
Collection getLockOperationConfigs(LockAnnotationParser parser);
}
}