| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hivetranse.transaction.jdbc; |
| 16 | |
| 17 | import java.lang.reflect.InvocationHandler; |
| 18 | import java.lang.reflect.InvocationTargetException; |
| 19 | import java.lang.reflect.Method; |
| 20 | import java.lang.reflect.Proxy; |
| 21 | import java.sql.Connection; |
| 22 | |
| 23 | import javax.sql.DataSource; |
| 24 | |
| 25 | import org.apache.commons.logging.Log; |
| 26 | import org.apache.hivemind.ApplicationRuntimeException; |
| 27 | import org.apache.hivemind.ServiceImplementationFactory; |
| 28 | import org.apache.hivemind.ServiceImplementationFactoryParameters; |
| 29 | import org.apache.hivemind.util.ToStringBuilder; |
| 30 | |
| 31 | import net.sourceforge.hivetranse.transaction.MandatoryTransactionException; |
| 32 | import net.sourceforge.hivetranse.transaction.TransactionService; |
| 33 | |
| 34 | /** |
| 35 | * This service creates Proxys to JDBC Connections. |
| 36 | * <p> |
| 37 | * <b>ServiceModel must be singleton</b> |
| 38 | * |
| 39 | * @author Jean-Francois Poilpret |
| 40 | */ |
| 41 | public class ConnectionProxyFactory implements ServiceImplementationFactory |
| 42 | { |
| 43 | public ConnectionProxyFactory(TransactionService txService) |
| 44 | { |
| 45 | _txService = txService; |
| 46 | } |
| 47 | |
| 48 | public Object createCoreServiceImplementation( |
| 49 | ServiceImplementationFactoryParameters factoryParams) |
| 50 | { |
| 51 | Log logger = factoryParams.getLog(); |
| 52 | String serviceId = factoryParams.getServiceId(); |
| 53 | Class serviceInterface = factoryParams.getServiceInterface(); |
| 54 | |
| 55 | // Make sure that serviceInterface == Connection |
| 56 | // (this factory is dedicated exclusively to JDBC Connections) |
| 57 | if (!Connection.class.equals(serviceInterface)) |
| 58 | { |
| 59 | // throw error |
| 60 | logger.error("ConnectionProxyFactory can only build Connection services."); |
| 61 | throw new ApplicationRuntimeException("Bad interface"); |
| 62 | } |
| 63 | |
| 64 | // Read parameter |
| 65 | Object service = factoryParams.getFirstParameter(); |
| 66 | if (service == null || !(service instanceof DataSource)) |
| 67 | { |
| 68 | // throw error |
| 69 | logger.error("ConnectionProxyFactory needs one DataSource service as parameter."); |
| 70 | throw new ApplicationRuntimeException("Bad DataSource interface"); |
| 71 | } |
| 72 | DataSource ds = (DataSource) service; |
| 73 | |
| 74 | return Proxy.newProxyInstance( |
| 75 | factoryParams.getInvokingModule().getClassResolver().getClassLoader(), |
| 76 | new Class[] {serviceInterface}, |
| 77 | new ConnectionProxy(logger, serviceId, ds)); |
| 78 | } |
| 79 | |
| 80 | private class ConnectionProxy implements InvocationHandler |
| 81 | { |
| 82 | public ConnectionProxy(Log logger, String serviceId, DataSource ds) |
| 83 | { |
| 84 | _logger = logger; |
| 85 | _serviceId = serviceId; |
| 86 | _ds = ds; |
| 87 | } |
| 88 | |
| 89 | //CSOFF: IllegalThrowsCheck |
| 90 | public Object invoke(Object proxy, Method method, Object[] args) |
| 91 | throws Throwable |
| 92 | { |
| 93 | if ("toString".equals(method.getName())) |
| 94 | { |
| 95 | ToStringBuilder builder = new ToStringBuilder(this); |
| 96 | builder.append("serviceId", _serviceId); |
| 97 | return builder.toString(); |
| 98 | } |
| 99 | |
| 100 | ConnectionsRepository repository = |
| 101 | (ConnectionsRepository) _txService.getCurrentTransaction(); |
| 102 | if (repository == null) |
| 103 | { |
| 104 | _logger.warn("No active transaction"); |
| 105 | throw new MandatoryTransactionException("No active transaction"); |
| 106 | } |
| 107 | Connection cnx = repository.getConnection(_serviceId, _ds); |
| 108 | try |
| 109 | { |
| 110 | return method.invoke(cnx, args); |
| 111 | } |
| 112 | catch (IllegalAccessException e) |
| 113 | { |
| 114 | // Can never happen (normally!) |
| 115 | _logger.fatal("Unexpected", e); |
| 116 | throw e; |
| 117 | } |
| 118 | catch (InvocationTargetException e) |
| 119 | { |
| 120 | throw e.getTargetException(); |
| 121 | } |
| 122 | } |
| 123 | //CSON: IllegalThrowsCheck |
| 124 | |
| 125 | private final Log _logger; |
| 126 | private final String _serviceId; |
| 127 | private final DataSource _ds; |
| 128 | } |
| 129 | |
| 130 | private final TransactionService _txService; |
| 131 | } |