org.eclipse.persistence.jpa.metadata.FileBasedProjectCache Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2012, 2014 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* 08/01/2012-2.5 Chris Delahunt - Bug 371950 - Metadata caching
******************************************************************************/
package org.eclipse.persistence.jpa.metadata;
import java.io.File;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.util.Map;
import org.eclipse.persistence.config.PersistenceUnitProperties;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.sessions.Project;
/**
* Purpose: Support serializing/deserializing a project representing application metadata
* to/from a file.
*
*/
public class FileBasedProjectCache implements ProjectCache {
@Override
public Project retrieveProject(Map properties, ClassLoader loader, SessionLog log) {
Project project = null;
java.io.ObjectInputStream in = null;
String fileName = (String)getConfigPropertyLogDebug(
PersistenceUnitProperties.PROJECT_CACHE_FILE,
properties, log);
if (fileName != null && fileName.length() > 0) {
try {
java.io.File file = new java.io.File(fileName);
java.io.FileInputStream fis = new java.io.FileInputStream(file);
in = new java.io.ObjectInputStream(fis);
project = (Project)in.readObject();
} catch (Exception e) {
//need exception differentiation,logging and warnings
//the project not being cached should be different than an exception from reading the stream
log.logThrowable(SessionLog.WARNING, SessionLog.JPA, e);
} finally {
if (in != null) {
try {
in.close();
} catch (java.io.IOException ignore) {
//ignore exceptions from close
}
}
}
}
return project;
}
@Override
public void storeProject(Project project, Map properties, SessionLog log) {
String fileName = (String)getConfigPropertyLogDebug(
PersistenceUnitProperties.PROJECT_CACHE_FILE,
properties, log);
if (fileName != null && fileName.length() > 0) {
FileOutputStream fos = null;
ObjectOutputStream out = null;
try {
File file = new File(fileName);
// creates the file
file.createNewFile();
fos = new FileOutputStream(file);
out = new ObjectOutputStream(fos);
out.writeObject(project);
} catch (Exception e) {
//the session is still usable, just not cachable so log a warning
log.logThrowable(SessionLog.WARNING, SessionLog.JPA, e);
} finally {
try {
if (out != null) {
out.close();
fos = null;
}
if (fos != null) {
fos.close();
}
} catch (java.io.IOException ignore) {}
}
}
}
/**
* Check the provided map for an object with the given name. If that object is not available, check the
* System properties. Log the value returned if logging is enabled at the FINEST level
* @param propertyName
* @param properties
* @param log
* @return
*/
public Object getConfigPropertyLogDebug(String propertyName, Map properties, SessionLog log) {
Object value = null;
if (properties != null) {
value = properties.get(propertyName);
}
if (value == null) {
value = System.getProperty(propertyName);
}
if ((value != null) && (log != null)) {
log.log(SessionLog.FINEST, SessionLog.PROPERTIES, "property_value_specified", new Object[]{propertyName, value});
}
return value;
}
}