ServiceHolder.java

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package org.glassfish.jersey.internal.inject;

import java.lang.reflect.Type;
import java.util.Set;

/**
 * Implementation of this class is used as a holder for service instance from
 * {@link InjectionManager} along with other information about the provided service.
 *
 * @see ServiceHolderImpl
 * @param <T>
 */
public interface ServiceHolder<T> {

    /**
     * An instance of the service got from {@link InjectionManager}.
     *
     * @return service instance.
     */
    T getInstance();

    /**
     * Gets an implementation class of the instance which is kept in this service holder.
     *
     * @return implementation class of the kept instance.
     */
    Class<T> getImplementationClass();

    /**
     * Gets all contracts which represents the kept instance.
     *
     * @return all contracts.
     */
    Set<Type> getContractTypes();

    /**
     * Gets ranking of the kept instance.
     *
     * @return instance's ranking.
     */
    int getRank();

}