Client.java

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/*******************************************************************************
 * ALMA - Atacama Large Millimeter Array
 * Copyright (c) ESO - European Southern Observatory, 2011
 * (in the framework of the ALMA collaboration).
 * All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *******************************************************************************/
package alma.demo.dyncomp;

import java.util.logging.Logger;
import alma.acs.component.client.ComponentClient;
import alma.ACS.ACSComponent;
import alma.ACS.ACSComponentHelper;
import alma.JavaContainerError.wrappers.AcsJContainerServicesEx;

import si.ijs.maci.ComponentSpec;
import si.ijs.maci.ComponentInfo;

public class Client extends ComponentClient {

        private final int MAXCOMPONENTS=32;
        // The two lists with the acivated components and their URLs
        // When a component is freed the items are not reordered (so a hole will exist in the
        // position of the freed element)
        // Free slots contain null
        ACSComponent m_components[];
        String m_cURLs[];

        public Client(Logger logger, String managerLoc, String clientName) 
                throws Exception
        {
                super(logger,managerLoc,clientName);
                m_components =  new ACSComponent[MAXCOMPONENTS];
                m_cURLs= new String[MAXCOMPONENTS];
                for (int t=0; t<MAXCOMPONENTS; t++) {
                        m_components[t]=null;
                        m_cURLs[t]=null;
                }
        }

        public boolean hasFreeSlot() {
                boolean ret=false;
                for (int t=0; t<MAXCOMPONENTS; t++) 
                        if (m_components[t]==null) ret=true;
                return ret;
        }

        public String getDynamicComponent(ComponentSpec cs, boolean markAsDefault) 
                throws AcsJContainerServicesEx
        {
                // Search for the first free slot in the array
                int freeSlot=0;
                while (freeSlot<MAXCOMPONENTS && m_components[freeSlot]!=null) freeSlot++;
                if (freeSlot<MAXCOMPONENTS) {
                        m_components[freeSlot]=ACSComponentHelper.narrow(getContainerServices().getDynamicComponent(cs,markAsDefault));
                        if (m_components[freeSlot]!=null) {
                                m_cURLs[freeSlot]=m_components[freeSlot].name();
                                return  m_cURLs[freeSlot];
                        } else {
                                m_cURLs[freeSlot]=null;
                                return null;
                        }
                }
                return null;
        }

        public boolean releaseComponent(String url) {
                // Search if the given url exists
                int t;
                for (t=0; t<MAXCOMPONENTS; t++) {
                        if (m_cURLs[t]!=null)
                                if (url.compareTo(m_cURLs[t])==0) break;
                }
                if (t<MAXCOMPONENTS && url.compareTo(m_cURLs[t])==0) {
                        getContainerServices().releaseComponent(url);
                        m_components[t]=null;
                        m_cURLs[t]=null;
                        return true;
                } else return false;
        }

        public void cleanExit() {
                String cURLs[];
                for (int t=0; t<MAXCOMPONENTS; t++) {
                        if (m_cURLs[t]!=null && m_components[t]!=null) 
                                getContainerServices().releaseComponent(m_cURLs[t]);
                                m_components[t]=null;
                                m_cURLs[t]=null;
                }
        }
}