edu.clemson.cs.nestbed.server.management.configuration.ProgramSymbolManagerImpl.java Source code

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Here is the source code for edu.clemson.cs.nestbed.server.management.configuration.ProgramSymbolManagerImpl.java

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/* $Id$ */
/*
 * ProgramSymbolManagerImpl.java
 *
 * Network Embedded Sensor Testbed (NESTbed)
 *
 * Copyright (C) 2006-2007
 * Dependable Systems Research Group
 * School of Computing
 * Clemson University
 * Andrew R. Dalton and Jason O. Hallstrom
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 *
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301, USA.
 */
package edu.clemson.cs.nestbed.server.management.configuration;

import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.clemson.cs.nestbed.common.management.configuration.ProgramProfilingSymbolManager;
import edu.clemson.cs.nestbed.common.management.configuration.ProgramSymbolManager;
import edu.clemson.cs.nestbed.common.model.ProgramProfilingSymbol;
import edu.clemson.cs.nestbed.common.model.ProgramSymbol;
import edu.clemson.cs.nestbed.server.adaptation.AdaptationException;
import edu.clemson.cs.nestbed.server.adaptation.AdapterFactory;
import edu.clemson.cs.nestbed.server.adaptation.AdapterType;
import edu.clemson.cs.nestbed.server.adaptation.ProgramSymbolAdapter;
import edu.clemson.cs.nestbed.server.util.RemoteObservableImpl;

public class ProgramSymbolManagerImpl extends RemoteObservableImpl implements ProgramSymbolManager {
    private final static ProgramSymbolManager instance;
    private final static Log log = LogFactory.getLog(ProgramSymbolManagerImpl.class);

    private ReadWriteLock managerLock;
    private Lock readLock;
    private Lock writeLock;
    private ProgramSymbolAdapter programSymbolAdapter;
    private Map<Integer, ProgramSymbol> programSymbols;

    static {
        ProgramSymbolManagerImpl impl = null;

        try {
            impl = new ProgramSymbolManagerImpl();
        } catch (Exception ex) {
            log.fatal("Unable to create singleton instance", ex);
            System.exit(1);
        } finally {
            instance = impl;
        }
    }

    public static ProgramSymbolManager getInstance() {
        return instance;
    }

    public ProgramSymbol getProgramSymbol(int id) throws RemoteException {
        readLock.lock();
        try {
            return programSymbols.get(id);
        } finally {
            readLock.unlock();
        }
    }

    public List<ProgramSymbol> getProgramSymbols(int programID) throws RemoteException {
        log.debug("getProgramSymbols() called.");

        List<ProgramSymbol> programSymbolList;
        programSymbolList = new ArrayList<ProgramSymbol>();

        readLock.lock();
        try {
            for (ProgramSymbol i : programSymbols.values()) {
                if (i.getProgramID() == programID) {
                    programSymbolList.add(i);
                }
            }
        } catch (Exception ex) {
            String msg = "Exception in getProgramSymbols";
            log.error(msg, ex);
            throw new RemoteException(msg, ex);
        } finally {
            readLock.unlock();
        }

        return programSymbolList;
    }

    public ProgramSymbol deleteProgramSymbol(int id) throws RemoteException {
        try {
            log.debug("Request to delete program symbol with id: " + id);

            cleanupProgramProfilingSymbol(id);

            ProgramSymbol programSymbol = programSymbolAdapter.deleteProgramSymbol(id);

            writeLock.lock();
            try {
                programSymbols.remove(programSymbol.getID());
            } finally {
                writeLock.unlock();
            }

            notifyObservers(Message.DELETE_SYMBOL, programSymbol);

            return programSymbol;
        } catch (AdaptationException ex) {
            throw new RemoteException("AdaptationException", ex);
        } catch (RemoteException ex) {
            throw ex;
        } catch (Exception ex) {
            String msg = "Exception in deleteProgramSymbol";
            log.error(msg, ex);
            throw new RemoteException(msg, ex);
        }
    }

    public void createProgramSymbol(int programID, String module, String symbol, int address, int size)
            throws RemoteException {
        writeLock.lock();
        try {
            log.debug(module + "." + symbol);
            ProgramSymbol programSymbol = programSymbolAdapter.createNewProgramSymbol(programID, module, symbol,
                    address, size);

            programSymbols.put(programSymbol.getID(), programSymbol);
        } catch (AdaptationException ex) {
            throw new RemoteException("AdaptationException", ex);
        } catch (Exception ex) {
            String msg = "Exception in createProgramSymbol";
            log.error(msg, ex);
            throw new RemoteException(msg, ex);
        } finally {
            writeLock.unlock();
        }
    }

    private void cleanupProgramProfilingSymbol(int programSymbolID) throws RemoteException {
        writeLock.lock();
        try {
            ProgramProfilingSymbolManagerImpl.getInstance().deleteProfilingSymbolWithID(programSymbolID);
            programSymbols.remove(programSymbolID);
        } finally {
            writeLock.unlock();
        }
    }

    private ProgramSymbolManagerImpl() throws RemoteException {
        super();

        try {
            this.managerLock = new ReentrantReadWriteLock(true);
            this.readLock = managerLock.readLock();
            this.writeLock = managerLock.writeLock();
            programSymbolAdapter = AdapterFactory.createProgramSymbolAdapter(AdapterType.SQL);
            programSymbols = programSymbolAdapter.readProgramSymbols();

            log.debug("ProgramSymbols read:\n" + programSymbols);
        } catch (AdaptationException ex) {
            throw new RemoteException("AdaptationException", ex);
        } catch (Exception ex) {
            String msg = "Exception in ProgramSymbolManagerImpl";
            log.error(msg, ex);
            throw new RemoteException(msg, ex);
        }
    }
}