wicket.protocol.http.FilePageStore.java Source code

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Here is the source code for wicket.protocol.http.FilePageStore.java

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/*
 * $Id: org.eclipse.jdt.ui.prefs 5004 2006-03-17 20:47:08 -0800 (Fri, 17 Mar
 * 2006) eelco12 $ $Revision: 5004 $ $Date: 2006-03-17 20:47:08 -0800 (Fri, 17
 * Mar 2006) $
 * 
 * ==============================================================================
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package wicket.protocol.http;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

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

import wicket.Application;
import wicket.Page;
import wicket.protocol.http.SecondLevelCacheSessionStore.IPageStore;
import wicket.util.lang.Objects;

/**
 * @author jcompagner
 */
public class FilePageStore implements IPageStore {
    /** log. */
    protected static Log log = LogFactory.getLog(FilePageStore.class);

    private File workDir;

    /**
     * Construct.
     */
    public FilePageStore() {
        workDir = (File) ((WebApplication) Application.get()).getServletContext()
                .getAttribute("javax.servlet.context.tempdir");
    }

    /**
     * @see wicket.protocol.http.SecondLevelCacheSessionStore.IPageStore#getPage(java.lang.String,
     *      int, int)
     */
    public Page getPage(String sessionId, int id, int versionNumber) {
        File sessionDir = new File(workDir, sessionId);
        if (sessionDir.exists()) {
            File pageFile = getPageFile(id, versionNumber, sessionDir);
            if (pageFile.exists()) {
                FileInputStream fis = null;
                try {
                    byte[] pageData = null;
                    fis = new FileInputStream(pageFile);
                    int length = (int) pageFile.length();
                    ByteBuffer bb = ByteBuffer.allocate(length);
                    fis.getChannel().read(bb);
                    if (bb.hasArray()) {
                        pageData = bb.array();
                    } else {
                        pageData = new byte[length];
                        bb.get(pageData);
                    }

                    Page page = (Page) Objects.byteArrayToObject(pageData);
                    return page.getVersion(versionNumber);
                } catch (Exception e) {
                    log.debug("Error loading page " + id + " with version " + versionNumber + " for the sessionid "
                            + sessionId + " from disc", e);
                } finally {
                    try {
                        if (fis != null) {
                            fis.close();
                        }
                    } catch (IOException ex) {
                        // ignore
                    }
                }
            }
        }
        return null;
    }

    /**
     * @param id
     * @param versionNumber
     * @param sessionDir
     * @return The file pointing to the page
     */
    private File getPageFile(int id, int versionNumber, File sessionDir) {
        return new File(sessionDir,
                Application.get().getApplicationKey() + "-page-" + id + "-version-" + versionNumber);
    }

    /**
     * @see wicket.protocol.http.SecondLevelCacheSessionStore.IPageStore#removePage(java.lang.String,
     *      wicket.Page)
     */
    public void removePage(String sessionId, Page page) {
        File sessionDir = new File(workDir, sessionId);
        if (sessionDir.exists()) {
            File pageFile = getPageFile(page.getNumericId(), page.getCurrentVersionNumber(), sessionDir);
            if (pageFile.exists()) {
                pageFile.delete();
            }
        }
    }

    /**
     * @see wicket.protocol.http.SecondLevelCacheSessionStore.IPageStore#storePage(java.lang.String,
     *      wicket.Page)
     */
    public void storePage(String sessionId, Page page) {
        File sessionDir = new File(workDir, sessionId);
        sessionDir.mkdirs();
        File pageFile = getPageFile(page.getNumericId(), page.getCurrentVersionNumber(), sessionDir);
        // TODO check can this be called everytime at this place? Putting should
        // be called after the rendering so it should be ok.
        page.internalDetach();
        byte[] bytes = Objects.objectToByteArray(page);
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(pageFile);
            ByteBuffer bb = ByteBuffer.wrap(bytes);
            fos.getChannel().write(bb);
        } catch (Exception e) {
            log.debug("Error saving page " + page.getId() + " with version " + page.getCurrentVersionNumber()
                    + " for the sessionid " + sessionId + " from disc", e);
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException ex) {
                // ignore
            }
        }

    }

    /**
     * @see wicket.protocol.http.SecondLevelCacheSessionStore.IPageStore#unbind(java.lang.String)
     */
    public void unbind(String sessionId) {
        File sessionDir = new File(workDir, sessionId);
        if (sessionDir.exists()) {
            File[] files = sessionDir.listFiles();
            if (files != null) {
                for (File element : files) {
                    element.delete();
                }
            }
            sessionDir.delete();
        }
    }
}