ManagedServiceFactoryImpl.java

/*
 * 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 WARRANTIESOR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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package org.apache.aries.tx.control.jdbc.local.impl;

import static java.util.Arrays.asList;
import static org.osgi.framework.Constants.OBJECTCLASS;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_DATABASE_NAME;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_DATASOURCE_NAME;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_DESCRIPTION;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_NETWORK_PROTOCOL;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_PASSWORD;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_PORT_NUMBER;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_ROLE_NAME;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_SERVER_NAME;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_URL;
import static org.osgi.service.jdbc.DataSourceFactory.JDBC_USER;
import static org.osgi.service.jdbc.DataSourceFactory.OSGI_JDBC_DRIVER_CLASS;

import java.util.Arrays;
import java.util.Collection;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicReference;

import org.apache.aries.tx.control.jdbc.common.impl.AbstractJDBCConnectionProvider;
import org.apache.aries.tx.control.resource.common.impl.ConfigurationDefinedResourceFactory;
import org.apache.aries.tx.control.resource.common.impl.LifecycleAware;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.jdbc.DataSourceFactory;
import org.osgi.service.transaction.control.jdbc.JDBCConnectionProvider;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ManagedServiceFactoryImpl extends ConfigurationDefinedResourceFactory {

	private static final Logger LOG = LoggerFactory.getLogger(ManagedServiceFactoryImpl.class);
	
	private static final String DSF_TARGET_FILTER = "aries.dsf.target.filter";
	private static final String JDBC_PROP_NAMES = "aries.jdbc.property.names";
	private static final List<String> JDBC_PROPERTIES = asList(JDBC_DATABASE_NAME, JDBC_DATASOURCE_NAME,
			JDBC_DESCRIPTION, JDBC_NETWORK_PROTOCOL, JDBC_PASSWORD, JDBC_PORT_NUMBER, JDBC_ROLE_NAME, JDBC_SERVER_NAME,
			JDBC_URL, JDBC_USER);

	public ManagedServiceFactoryImpl(BundleContext context) {
		super(context);
	}

	@Override
	public String getName() {
		return "Aries JDBCConnectionProvider (Local only) service";
	}

	@Override
	protected LifecycleAware getConfigurationDrivenResource(BundleContext context, 
			String pid, Map<String, Object> properties) throws Exception {
		Properties jdbcProps = getJdbcProps(pid, properties);
	
		try {
			return new ManagedJDBCResourceProvider(context, pid, jdbcProps, properties);
		} catch (InvalidSyntaxException e) {
			LOG.error("The configuration {} contained an invalid target filter {}", pid, e.getFilter());
			throw new ConfigurationException(DSF_TARGET_FILTER, "The target filter was invalid", e);
		}
	}

	@SuppressWarnings("unchecked")
	private Properties getJdbcProps(String pid, Map<String, Object> properties) throws ConfigurationException {

		Object object = properties.getOrDefault(JDBC_PROP_NAMES, JDBC_PROPERTIES);
		Collection<String> propnames;
		if (object instanceof String) {
			propnames = Arrays.asList(((String) object).split(","));
		} else if (object instanceof String[]) {
			propnames = Arrays.asList((String[]) object);
		} else if (object instanceof Collection) {
			propnames = (Collection<String>) object;
		} else {
			LOG.error("The configuration {} contained an invalid list of JDBC property names", pid, object);
			throw new ConfigurationException(JDBC_PROP_NAMES,
					"The jdbc property names must be a String+ or comma-separated String");
		}

		Properties p = new Properties();

		propnames.stream().filter(properties::containsKey)
				.forEach(s -> p.setProperty(s, String.valueOf(properties.get(s))));

		return p;
	}

	private static class ManagedJDBCResourceProvider
			implements ServiceTrackerCustomizer<DataSourceFactory, DataSourceFactory>, LifecycleAware {

		private final BundleContext context;
		private final String pid;
		private final Properties jdbcProperties;
		private final Map<String, Object> providerProperties;
		private final ServiceTracker<DataSourceFactory, DataSourceFactory> dsfTracker;

		private final AtomicReference<DataSourceFactory> activeDsf = new AtomicReference<>();
		private final AtomicReference<ServiceRegistration<JDBCConnectionProvider>> serviceReg = new AtomicReference<>();
		private final AtomicReference<AbstractJDBCConnectionProvider> providerObject = new AtomicReference<>();

		public ManagedJDBCResourceProvider(BundleContext context, String pid, Properties jdbcProperties,
				Map<String, Object> providerProperties) throws InvalidSyntaxException, ConfigurationException {
			this.context = context;
			this.pid = pid;
			this.jdbcProperties = jdbcProperties;
			this.providerProperties = providerProperties;

			String targetFilter = (String) providerProperties.get(DSF_TARGET_FILTER);
			if (targetFilter == null) {
				String driver = (String) providerProperties.get(OSGI_JDBC_DRIVER_CLASS);
				if (driver == null) {
					LOG.error("The configuration {} must specify a target filter or a JDBC driver class", pid);
					throw new ConfigurationException(OSGI_JDBC_DRIVER_CLASS,
							"The configuration must specify either a target filter or a JDBC driver class");
				}
				targetFilter = "(&(" + OBJECTCLASS + "=" + DataSourceFactory.class.getName() + ")(" + OSGI_JDBC_DRIVER_CLASS + "=" + driver + "))";
			}

			targetFilter = "(&(" + OBJECTCLASS + "=" + DataSourceFactory.class.getName() + ")" + targetFilter + ")";

			this.dsfTracker = new ServiceTracker<>(context, context.createFilter(targetFilter), this);
		}

		public void start() {
			dsfTracker.open();
		}

		public void stop() {
			dsfTracker.close();
		}

		@Override
		public DataSourceFactory addingService(ServiceReference<DataSourceFactory> reference) {
			DataSourceFactory service = context.getService(reference);

			updateService(service);
			return service;
		}

		private void updateService(DataSourceFactory service) {
			boolean setDsf;
			synchronized (this) {
				setDsf = activeDsf.compareAndSet(null, service);
			}

			if (setDsf) {
				AbstractJDBCConnectionProvider provider = null;
				ServiceRegistration<JDBCConnectionProvider> reg = null;
				try {
					provider = new JDBCConnectionProviderFactoryImpl().getProviderFor(service,
							jdbcProperties, providerProperties);
					reg = context.registerService(JDBCConnectionProvider.class, 
							provider, getServiceProperties());
					synchronized (this) {
						if (!serviceReg.compareAndSet(null, reg)) {
							throw new IllegalStateException("Unable to set the JDBC connection provider registration");
						} else {
							providerObject.set(provider);
						}
					}
				} catch (Exception e) {
					activeDsf.compareAndSet(service, null);
					safeUnregister(reg, provider);
					LOG.error("An error occurred when creating the connection provider for {}.", pid, e);
				}
			}
		}

		private Dictionary<String, ?> getServiceProperties() {
			Hashtable<String, Object> props = new Hashtable<>();
			providerProperties.keySet().stream()
					.filter(s -> !s.startsWith("."))
					.filter(s -> !JDBC_PASSWORD.equals(s))
					.forEach(s -> props.put(s, providerProperties.get(s)));
			return props;
		}

		@Override
		public void modifiedService(ServiceReference<DataSourceFactory> reference, DataSourceFactory service) {
		}

		@Override
		public void removedService(ServiceReference<DataSourceFactory> reference, DataSourceFactory service) {
			boolean dsfLeft;
			ServiceRegistration<JDBCConnectionProvider> oldReg = null;
			AbstractJDBCConnectionProvider oldProvider = null;
			synchronized (this) {
				dsfLeft = activeDsf.compareAndSet(service, null);
				if (dsfLeft) {
					oldReg = serviceReg.getAndSet(null);
					oldProvider = providerObject.getAndSet(null);
				}
			}
			
			safeUnregister(oldReg, oldProvider);

			if (dsfLeft) {
				DataSourceFactory newDSF = dsfTracker.getService();
				if (newDSF != null) {
					updateService(dsfTracker.getService());
				}
			}
		}

		private void safeUnregister(ServiceRegistration<?> oldReg, 
				AbstractJDBCConnectionProvider provider) {
			if (oldReg != null) {
				try {
					oldReg.unregister();
				} catch (IllegalStateException ise) {
					LOG.debug("An exception occurred when unregistering a service for {}", pid);
				}
			}
			if(provider != null) {
				try {
					provider.close();
				} catch (Exception e) {
					LOG.debug("An exception occurred when closing a provider for {}", pid, e);
				}
			}
		}
	}
}