/*
* Copyright 2010 Proofpoint, Inc.
*
* 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 com.proofpoint.dbpool;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Scopes;
import org.weakref.jmx.guice.MBeanModule;
import javax.sql.DataSource;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.List;
import static com.proofpoint.configuration.ConfigurationModule.bindConfig;
public class H2EmbeddedDataSourceModule extends MBeanModule
{
private final Class<? extends Annotation> annotation;
private final List<Class<? extends Annotation>> aliases;
private final String propertyPrefix;
@SafeVarargs
public H2EmbeddedDataSourceModule(String propertyPrefix, Class<? extends Annotation> annotation, Class<? extends Annotation>... aliases)
{
if (annotation == null) {
throw new NullPointerException("annotation is null");
}
if (propertyPrefix == null) {
throw new NullPointerException("propertyPrefix is null");
}
if (propertyPrefix.isEmpty()) {
throw new IllegalArgumentException("propertyPrefix is empty");
}
this.annotation = annotation;
this.propertyPrefix = propertyPrefix;
if (aliases != null) {
this.aliases = ImmutableList.copyOf(aliases);
}
else {
this.aliases = Collections.emptyList();
}
}
@Override
public void configureMBeans()
{
// bind the configuration
bindConfig(binder()).annotatedWith(annotation).prefixedWith(propertyPrefix).to(H2EmbeddedDataSourceConfig.class);
// Bind the datasource
bind(DataSource.class).annotatedWith(annotation).toProvider(new H2EmbeddedDataSourceProvider(annotation)).in(Scopes.SINGLETON);
export(DataSource.class).annotatedWith(annotation).withGeneratedName();
// Bind aliases
Key<DataSource> key = Key.get(DataSource.class, annotation);
for (Class<? extends Annotation> alias : aliases) {
bind(DataSource.class).annotatedWith(alias).to(key);
}
}
private static class H2EmbeddedDataSourceProvider implements Provider<H2EmbeddedDataSource>
{
private final Class<? extends Annotation> annotation;
private Injector injector;
private H2EmbeddedDataSourceProvider(Class<? extends Annotation> annotation)
{
this.annotation = annotation;
}
@Inject
public void setInjector(Injector injector)
{
this.injector = injector;
}
@Override
public H2EmbeddedDataSource get()
{
H2EmbeddedDataSourceConfig config = injector.getInstance(Key.get(H2EmbeddedDataSourceConfig.class, annotation));
try {
return new H2EmbeddedDataSource(config);
}
catch (Exception e) {
throw new ProvisionException("Error creating a H2EmbeddedDataSource", e);
}
}
}
}