EDIT

/**

 * Copyright (C) 2015 EDIT

 * European Distributed Institute of Taxonomy

 * http://www.e-taxonomy.eu

 *

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.taxeditor.view.sessions;

import java.text.DecimalFormat;

import java.util.Collection;

import javax.annotation.PostConstruct;

import javax.inject.Inject;

import org.eclipse.core.commands.Command;

import org.eclipse.core.commands.ParameterizedCommand;

import org.eclipse.e4.core.commands.ECommandService;

import org.eclipse.e4.core.commands.EHandlerService;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Table;

import org.eclipse.swt.widgets.TableColumn;

import org.eclipse.swt.widgets.TableItem;

import org.eclipse.swt.widgets.Text;

import org.eclipse.wb.swt.SWTResourceManager;

import eu.etaxonomy.cdm.api.cache.CdmPermanentCacheBase;

import eu.etaxonomy.cdm.cache.CdmRemoteCacheManager;

import eu.etaxonomy.taxeditor.session.ICdmEntitySession;

import eu.etaxonomy.taxeditor.session.ICdmEntitySessionManager;

import eu.etaxonomy.taxeditor.session.ICdmEntitySessionManagerObserver;

import eu.etaxonomy.taxeditor.session.NullSession;

import eu.etaxonomy.taxeditor.store.CdmStore;

import net.sf.ehcache.Cache;

import net.sf.ehcache.CacheManager;

import net.sf.ehcache.statistics.FlatStatistics;

/**

 * @author cmathew

 * @date 16 Feb 2015

 */

public class SessionsViewPart implements ICdmEntitySessionManagerObserver {

    public static final String ID = "eu.etaxonomy.taxeditor.view.sessions.SessionsViewPart"; //$NON-NLS-1$

    public static final String OPEN_INSPECT_SESSIONS_DIALOG_ID =  "eu.etaxonomy.taxeditor.store.open.InspectSessionsDialog";

    private Table tableSessions;

    private final String[] titles = { "Owner", "In Memory", "On Disk"};

    private final ICdmEntitySessionManager cdmEntitySessionManager;

    private Text txtNoOfSessions;

    private Text txtNoOfCaches;

    private Text txtPermanentInMemory;

    private Text txtCdmModelInMemory;

    private Text txtCdmModelOnDisk;

    private Text txtPermanentOnDisk;

    @Inject

    private ECommandService commandService;

    @Inject

    private EHandlerService handlerService;

    @Inject

    public SessionsViewPart() {

        this.cdmEntitySessionManager = CdmStore.getCurrentSessionManager();

        if(cdmEntitySessionManager != null) {

            cdmEntitySessionManager.addSessionObserver(this);

        }

    }

    /**

     * Create contents of the view part.

     * @param parent

     */

    @SuppressWarnings("unused")

    @PostConstruct

    public void createPartControl(Composite parent) {

        Composite container = new Composite(parent, SWT.NONE);

        container.setLayout(new GridLayout(5, false));

        {

            Label lblNoOfSessions = new Label(container, SWT.NONE);

            lblNoOfSessions.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblNoOfSessions.setAlignment(SWT.RIGHT);

            GridData gd_lblNoOfSessions = new GridData(SWT.RIGHT, SWT.FILL, false, false, 1, 1);

            gd_lblNoOfSessions.widthHint = 115;

            gd_lblNoOfSessions.minimumHeight = 30;

            lblNoOfSessions.setLayoutData(gd_lblNoOfSessions);

            lblNoOfSessions.setText("No. of Sessions : ");

        }

        {

            txtNoOfSessions = new Text(container, SWT.BORDER);

            txtNoOfSessions.setEditable(false);

            txtNoOfSessions.setBackground(SWTResourceManager.getColor(SWT.COLOR_TITLE_INACTIVE_BACKGROUND_GRADIENT));

            GridData gd_txtNoOfSessions = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtNoOfSessions.widthHint = 50;

            txtNoOfSessions.setLayoutData(gd_txtNoOfSessions);

        }

        new Label(container, SWT.NONE);

        new Label(container, SWT.NONE);

        new Label(container, SWT.NONE);

        {

            Label lblNoOfCaches = new Label(container, SWT.CENTER);

            lblNoOfCaches.setAlignment(SWT.RIGHT);

            lblNoOfCaches.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            GridData gd_lblNoOfCaches = new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1);

            gd_lblNoOfCaches.widthHint = 150;

            lblNoOfCaches.setLayoutData(gd_lblNoOfCaches);

            lblNoOfCaches.setText("No. of entity caches : ");

        }

        {

            txtNoOfCaches = new Text(container, SWT.BORDER);

            txtNoOfCaches.setEditable(false);

            GridData gd_txtNoOfCaches = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtNoOfCaches.widthHint = 50;

            txtNoOfCaches.setLayoutData(gd_txtNoOfCaches);

        }

        new Label(container, SWT.NONE);

        new Label(container, SWT.NONE);

        new Label(container, SWT.NONE);

        {

            Label lblPermanentCache = new Label(container, SWT.CENTER);

            lblPermanentCache.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

            lblPermanentCache.setText("Permanent Cache, ");

            lblPermanentCache.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblPermanentCache.setAlignment(SWT.RIGHT);

        }

        {

            Label lblPermanentInMemory = new Label(container, SWT.CENTER);

            lblPermanentInMemory.setText("in Memory : ");

            lblPermanentInMemory.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblPermanentInMemory.setAlignment(SWT.RIGHT);

            lblPermanentInMemory.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

        }

        {

            txtPermanentInMemory = new Text(container, SWT.BORDER);

            txtPermanentInMemory.setEditable(false);

            GridData gd_txtPermanentInMemory = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtPermanentInMemory.widthHint = 130;

            txtPermanentInMemory.setLayoutData(gd_txtPermanentInMemory);

        }

        {

            Label lblPermanentOnDisk = new Label(container, SWT.CENTER);

            lblPermanentOnDisk.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

            lblPermanentOnDisk.setText("on Disk : ");

            lblPermanentOnDisk.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblPermanentOnDisk.setAlignment(SWT.RIGHT);

        }

        {

            txtPermanentOnDisk = new Text(container, SWT.BORDER);

            txtPermanentOnDisk.setEditable(false);

            txtPermanentOnDisk.setText("");

            GridData gd_txtPermanentOnDisk = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtPermanentOnDisk.widthHint = 130;

            txtPermanentOnDisk.setLayoutData(gd_txtPermanentOnDisk);

        }

        {

            Label lblCdmModelCache = new Label(container, SWT.CENTER);

            lblCdmModelCache.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

            lblCdmModelCache.setText("CDM Model Cache, ");

            lblCdmModelCache.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblCdmModelCache.setAlignment(SWT.RIGHT);

        }

        {

            Label lblCdmModelInMemory = new Label(container, SWT.CENTER);

            lblCdmModelInMemory.setText("in Memory : ");

            lblCdmModelInMemory.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblCdmModelInMemory.setAlignment(SWT.RIGHT);

            GridData gd_lblCdmModelInMemory = new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1);

            gd_lblCdmModelInMemory.widthHint = 86;

            lblCdmModelInMemory.setLayoutData(gd_lblCdmModelInMemory);

        }

        {

            txtCdmModelInMemory = new Text(container, SWT.BORDER);

            txtCdmModelInMemory.setEditable(false);

            GridData gd_txtCdmModelInMemory = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtCdmModelInMemory.widthHint = 130;

            txtCdmModelInMemory.setLayoutData(gd_txtCdmModelInMemory);

        }

        {

            Label lblCdmModelOnDisk = new Label(container, SWT.CENTER);

            lblCdmModelOnDisk.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));

            lblCdmModelOnDisk.setText("on Disk : ");

            lblCdmModelOnDisk.setFont(SWTResourceManager.getFont("Ubuntu", 10, SWT.NORMAL));

            lblCdmModelOnDisk.setAlignment(SWT.RIGHT);

        }

        {

            txtCdmModelOnDisk = new Text(container, SWT.BORDER);

            txtCdmModelOnDisk.setEditable(false);

            txtCdmModelOnDisk.setText("");

            GridData gd_txtCdmModelOnDisk = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);

            gd_txtCdmModelOnDisk.widthHint = 130;

            txtCdmModelOnDisk.setLayoutData(gd_txtCdmModelOnDisk);

        }

        {

            Button btnRefresh = new Button(container, SWT.NONE);

            btnRefresh.addSelectionListener(new SelectionAdapter() {

                @Override

                public void widgetSelected(SelectionEvent e) {

                    changed();

                }

            });

            GridData gd_btnRefresh = new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1);

            gd_btnRefresh.widthHint = 100;

            btnRefresh.setLayoutData(gd_btnRefresh);

            btnRefresh.setText("Refresh");

        }

        {

            Button btnInspectActiveSession = new Button(container, SWT.NONE);

            btnInspectActiveSession.addSelectionListener(new SelectionAdapter() {

                @Override

                public void widgetSelected(SelectionEvent e) {

                    Command command = commandService.getCommand(OPEN_INSPECT_SESSIONS_DIALOG_ID);

                    handlerService.executeHandler(ParameterizedCommand.generateCommand(command, null));

                }

            });

            btnInspectActiveSession.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 2, 1));

            btnInspectActiveSession.setText("Inspect Active Session");

        }

        new Label(container, SWT.NONE);

        new Label(container, SWT.NONE);

        {

            tableSessions = new Table(container, SWT.BORDER | SWT.FULL_SELECTION);

            GridData gd_tableSessions = new GridData(SWT.FILL, SWT.FILL, true, true, 5, 1);

            gd_tableSessions.widthHint = 769;

            tableSessions.setLayoutData(gd_tableSessions);

            tableSessions.setHeaderVisible(true);

            tableSessions.setLinesVisible(true);

        }

        createActions();

    }

    /**

     * Create the actions.

     */

    private void createActions() {

        for (String title : titles) {

            TableColumn column = new TableColumn(tableSessions, SWT.NULL);

            column.setWidth(200);

            column.setText(title);

        }

        changed();

    }

    @Override

    public void changed() {

        if(tableSessions.isDisposed()) {

            return;

        }

        tableSessions.removeAll();

        if(cdmEntitySessionManager != null) {

            Collection<ICdmEntitySession> sessions = cdmEntitySessionManager.getSessions();

            txtNoOfSessions.setText(String.valueOf(sessions.size()));

            for(ICdmEntitySession session : sessions) {

                addSession(session);

            }

            ICdmEntitySession nullSession = cdmEntitySessionManager.getNullSession();

            if(nullSession != null) {

                addSession(nullSession);

            }

            for (int i=0; i<titles.length; i++) {

                tableSessions.getColumn (i).pack ();

            }

        }

        CdmRemoteCacheManager instance = CdmRemoteCacheManager.INSTANCE();

        int cdmEnityCacheSize = CacheManager.create().getCacheNames().length;

        txtNoOfCaches.setText(String.valueOf(cdmEnityCacheSize));

        Cache permanentCache = CacheManager.create().getCache(CdmPermanentCacheBase.PERMANENT_CACHE_NAME);

        txtPermanentInMemory.setText("");

        txtPermanentOnDisk.setText("");

        if(permanentCache != null) {

        	FlatStatistics liveCacheStatistics = permanentCache.getStatistics();

            txtPermanentInMemory.setText(getInMemoryStats(liveCacheStatistics));

            txtPermanentOnDisk.setText(getOnDiskStats(liveCacheStatistics));

        }

        Cache cdmModelGetMethodsCache = instance.getCdmModelGetMethodsCache();

        txtCdmModelInMemory.setText("");

        txtCdmModelOnDisk.setText("");

        if(cdmModelGetMethodsCache != null) {

        	FlatStatistics liveCacheStatistics = cdmModelGetMethodsCache.getStatistics();

            txtCdmModelInMemory.setText(getInMemoryStats(liveCacheStatistics));

            txtCdmModelOnDisk.setText(getOnDiskStats(liveCacheStatistics));

        }

    }

    private void addSession(ICdmEntitySession session) {

        TableItem item = new TableItem(tableSessions, SWT.NULL);

        String activePrefix = "";

        if(session.isActive()) {

            activePrefix = "*";

        }

        String sessionOwnerString = "";

        if(session instanceof NullSession) {

            sessionOwnerString = "Null Session";

        } else {

            if(session.getOwner() != null) {

                sessionOwnerString = session.getOwner().toString();

            }

        }

        item.setText(0, activePrefix + sessionOwnerString);

        FlatStatistics cacheStatistics = session.getCacheStatistics();

        item.setText(1, getInMemoryStats(cacheStatistics));

        item.setText(2, getOnDiskStats(cacheStatistics));

    }

    private String getInMemoryStats(FlatStatistics statistics) {

        if(statistics != null) {

            long localHeapSize = statistics.getLocalHeapSize();

            long localHeapSizeInBytes = statistics.getLocalHeapSizeInBytes();

            String localHeapSizeInBytesStr =

                    (new DecimalFormat("#.##")).format(localHeapSizeInBytes/1048576.0);

            return String.valueOf(localHeapSize) + " objects / " + localHeapSizeInBytesStr + " Mb";

        }

        return "";

    }

    private String getOnDiskStats(FlatStatistics statistics) {

        if(statistics != null) {

            long localDiskSize = statistics.getLocalDiskSize();

            long localDiskSizeInBytes = statistics.getLocalDiskSizeInBytes();

            String localDiskSizeInBytesStr =

                    (new DecimalFormat("#.##")).format(localDiskSizeInBytes/1048576.0);

            return String.valueOf(localDiskSize) + " objects / " + localDiskSizeInBytesStr + " Mb";

        }

        return "";

    }

}