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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; } }





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