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package org.netbeans.spi.server;

import java.util.List;
import javax.swing.event.ChangeListener;
import org.netbeans.api.server.ServerInstance;

 * Provides the known server instances. Any registered listener must be
 * notified when instance is added or removed during the life of the provider.
 * <p>
 * In order to register your provider you have to register it in filesystem
 * in folder <code>Servers</code>.
 * <p>
 * Note you can use {@link org.openide.util.ChangeSupport} for implementation
 * of listener logic.
 * @author Petr Hejl
public interface ServerInstanceProvider {

     * Returns the list of known server instances.
     * @return the list of known server instances
    List<ServerInstance> getInstances();

     * Adds a change listener to the provider. The listener must be notified
     * any time instance is added or removed.
     * @param listener listener to add, <code>null</code> is allowed (but it si noop then)
    void addChangeListener(ChangeListener listener);

     * Removes the previously added listener. No more events will be fired on
     * the listener.
     * @param listener listener to remove, <code>null</code> is allowed (but it si noop then)
    void removeChangeListener(ChangeListener listener);

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