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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.openjpa.conf;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.List;
import java.util.ArrayList;
import org.apache.openjpa.lib.conf.Configurable;
import org.apache.openjpa.lib.conf.Configuration;
import org.apache.openjpa.lib.conf.Configurations;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.InternalException;
/**
* Default {@link CacheMarshaller} implementation that writes data
* to a specified file and reads data from a specified file or URL.
*
* @since 1.1.0
*/
public class CacheMarshallerImpl
implements CacheMarshaller, Configurable {
private static final Localizer _loc =
Localizer.forPackage(CacheMarshallerImpl.class);
private String _id;
private ValidationPolicy _validationPolicy;
private OpenJPAConfiguration _conf;
private Log _log;
private File _outputFile;
private URL _inputURL;
// temporary storage for resource location specification
private String _inputResourceLocation;
private boolean _consumeErrors = true;
public Object load() {
if (_inputURL == null) {
_log.trace(_loc.get("cache-marshaller-no-inputs", getId()));
return null;
}
Object o = null;
ObjectInputStream in = null;
try {
in = new ObjectInputStream(new BufferedInputStream(
_inputURL.openStream()));
o = in.readObject();
o = _validationPolicy.getValidData(o);
if (o != null && o.getClass().isArray()) {
Object[] array = (Object[]) o;
for (int i = 0; i < array.length; i++)
configure(array[i]);
} else {
configure(o);
}
if (_log.isTraceEnabled())
_log.trace(_loc.get("cache-marshaller-loaded",
o == null ? null : o.getClass().getName(), _inputURL));
} catch (Exception e) {
if (_consumeErrors) {
if (_log.isWarnEnabled())
_log.warn(_loc.get("cache-marshaller-load-exception-ignore",
_inputURL), e);
} else {
throw new InternalException(
_loc.get("cache-marshaller-load-exception-fatal",
_inputURL),
e);
}
} finally {
if (in != null)
try { in.close(); } catch (IOException e) { }
}
return o;
}
private void configure(Object o) {
if (o instanceof Configurable) {
((Configurable) o).setConfiguration(_conf);
((Configurable) o).startConfiguration();
((Configurable) o).endConfiguration();
}
}
public void store(Object o) {
if (_outputFile == null) {
_log.trace(_loc.get("cache-marshaller-no-output-file", getId()));
return;
}
OutputStream out = null;
try {
out = new FileOutputStream(_outputFile);
ObjectOutputStream oos =
new ObjectOutputStream(new BufferedOutputStream(out));
Object toStore = _validationPolicy.getCacheableData(o);
oos.writeObject(toStore);
oos.flush();
out.flush();
if (_log.isTraceEnabled())
_log.trace(_loc.get("cache-marshaller-stored",
o.getClass().getName(), _outputFile));
} catch (Exception e) {
if (_consumeErrors) {
if (_log.isWarnEnabled())
_log.warn(_loc.get("cache-marshaller-store-exception",
o.getClass().getName(), _outputFile), e);
} else {
throw new InternalException(
_loc.get("cache-marshaller-store-exception",
o.getClass().getName(), _outputFile),
e);
}
} finally {
if (out != null) {
try { out.close(); } catch (IOException ioe) { }
}
}
}
public void setOutputFile(File file) {
_outputFile = file;
}
public File getOutputFile() {
return _outputFile;
}
public void setInputURL(URL url) {
_inputURL = url;
}
public void setInputResource(String resource) {
_inputResourceLocation = resource;
}
public void setConsumeSerializationErrors(boolean consume) {
_consumeErrors = consume;
}
public String getId() {
return _id;
}
public void setId(String id) {
_id = id;
}
public void setValidationPolicy(String policy)
throws InstantiationException, IllegalAccessException {
String name = Configurations.getClassName(policy);
String props = Configurations.getProperties(policy);
_validationPolicy = (ValidationPolicy)
Configurations.newInstance(name, _conf, props, null);
}
public ValidationPolicy getValidationPolicy() {
return _validationPolicy;
}
public void setConfiguration(Configuration conf) {
_conf = (OpenJPAConfiguration) conf;
_log = conf.getConfigurationLog();
}
public void startConfiguration() {
}
public void endConfiguration() {
if (_inputResourceLocation != null && _inputURL != null)
throw new IllegalStateException(
_loc.get("cache-marshaller-input-url-and-resource-specified")
.getMessage());
if (_inputResourceLocation != null)
setInputUrlFromResourceLocation();
if (_validationPolicy == null)
throw new IllegalStateException(
_loc.get("cache-marshaller-null-validation-policy",
getClass().getName()).getMessage());
if (_id == null)
throw new IllegalStateException(
_loc.get("cache-marshaller-null-id",
getClass().getName()).getMessage());
}
private void setInputUrlFromResourceLocation() {
try {
ClassLoader cl = _conf.getClassResolverInstance()
.getClassLoader(getClass(), null);
List list = new ArrayList();
for (Enumeration e = cl.getResources(_inputResourceLocation);
e.hasMoreElements(); )
list.add(e);
if (list.size() > 1) {
if (_consumeErrors) {
if (_log.isWarnEnabled())
_log.warn(_loc.get(
"cache-marshaller-multiple-resources-warn",
getId(), _inputResourceLocation, list)
.getMessage());
} else {
throw new IllegalStateException(
_loc.get("cache-marshaller-multiple-resources",
getId(), _inputResourceLocation, list)
.getMessage());
}
}
if (!list.isEmpty())
_inputURL = (URL) list.get(0);
} catch (IOException ioe) {
IllegalStateException ise = new IllegalStateException(
_loc.get("cache-marshaller-bad-url", getId(),
_inputResourceLocation).getMessage());
ise.initCause(ioe);
throw ise;
}
}
}
