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*
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package org.glassfish.hk2.utilities;
import java.util.HashSet;
import java.util.Set;
import org.glassfish.hk2.api.Descriptor;
import org.glassfish.hk2.api.IndexedFilter;
import org.glassfish.hk2.api.PerLookup;
import org.glassfish.hk2.api.PopulatorPostProcessor;
import org.glassfish.hk2.api.ServiceLocator;
/**
* This post-processor removes duplicate descriptors from the
* set of descriptors being added to the service registry.
*
* It is often the case when using a classpath that the same jar
* file can appear on the path more than once. For example this
* is often done when patching. However, if this jar contains
* HK2 descriptor files in it, that can mean duplicate services
* that are not intended to be duplicated. This service removes
* all duplicate descriptors from the set to be added to HK2
*
* @author jwells
*
*/
@PerLookup
public class DuplicatePostProcessor implements PopulatorPostProcessor {
private final HashSet dupSet = new HashSet();
/* (non-Javadoc)
* @see org.glassfish.hk2.bootstrap.PopulatorPostProcessor#process(org.glassfish.hk2.utilities.DescriptorImpl)
*/
@Override
public DescriptorImpl process(ServiceLocator serviceLocator, DescriptorImpl descriptorImpl) {
if (dupSet.contains(descriptorImpl)) {
return null;
}
dupSet.add(descriptorImpl);
Set contracts = descriptorImpl.getAdvertisedContracts();
String contract = null;
for (String candidate : contracts) {
if (candidate.equals(descriptorImpl.getImplementation())) {
// Prefer this one over anything else
contract = candidate;
break;
}
contract = candidate;
}
final String fContract = contract;
final String fName = descriptorImpl.getName();
final DescriptorImpl fDescriptorImpl = descriptorImpl;
if (serviceLocator.getBestDescriptor(new IndexedFilter() {
@Override
public boolean matches(Descriptor d) {
return fDescriptorImpl.equals(d);
}
@Override
public String getAdvertisedContract() {
return fContract;
}
@Override
public String getName() {
return fName;
}
}) != null) {
// Already in the locator, do not add again
return null;
}
return descriptorImpl;
}
}