Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2013 Milad Naseri. * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.mmnaseri.dragonfly.data.impl; import com.mmnaseri.couteau.basics.api.Processor; import com.mmnaseri.dragonfly.statement.impl.DelegatingCallableStatement; import com.mmnaseri.dragonfly.statement.impl.DelegatingPreparedStatement; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.sql.*; import java.util.Map; import java.util.Properties; import java.util.concurrent.Executor; /** * This is an implementation of the traditional {@link Connection} interface provided * through JDBC. This implementation takes a real connection as the underlying, actual * connection to the data source. This class adds nested connection opening and closing * to the functionalities of the connection. * * @author Milad Naseri (mmnaseri@programmer.net) * @since 1.0 (2013/10/2, 21:24) */ public class DelegatingConnection implements Connection { private static final Log log = LogFactory.getLog(Connection.class); private final Connection connection; private final Processor<Connection> closeCallback; private final ThreadLocal<Long> opened; public DelegatingConnection(Connection connection, Processor<Connection> closeCallback) { this.closeCallback = closeCallback; this.connection = connection; this.opened = new ThreadLocal<Long>() { @Override protected Long initialValue() { return 0L; } }; log.info("Connection requested"); } @Override public Statement createStatement() throws SQLException { log.info("Creating statement ..."); return connection.createStatement(); } @Override public PreparedStatement prepareStatement(String sql) throws SQLException { log.info("Preparing statement " + sql); return new DelegatingPreparedStatement(connection.prepareStatement(sql), this); } @Override public CallableStatement prepareCall(String sql) throws SQLException { log.info("Preparing call " + sql); return new DelegatingCallableStatement(connection.prepareCall(sql), this); } @Override public String nativeSQL(String sql) throws SQLException { log.info("Fetching native SQL for " + sql); return connection.nativeSQL(sql); } @Override public void setAutoCommit(boolean autoCommit) throws SQLException { log.info("Changing auto-commit mode for connection"); connection.setAutoCommit(autoCommit); } @Override public boolean getAutoCommit() throws SQLException { return connection.getAutoCommit(); } @Override public void commit() throws SQLException { log.info("Committing connection"); if (!connection.getAutoCommit()) { connection.commit(); } } @Override public void rollback() throws SQLException { log.warn("Rolling back changes made through the connection"); if (!connection.getAutoCommit()) { connection.rollback(); } } public void open() { opened.set(opened.get() + 1); } @Override public void close() throws SQLException { opened.set(opened.get() - 1); if (opened.get() < 0) { throw new IllegalStateException(); } log.info("Closing the connection"); if (opened.get() > 0) { return; } closeCallback.process(this); connection.close(); } @Override public boolean isClosed() throws SQLException { return connection.isClosed(); } @Override public DatabaseMetaData getMetaData() throws SQLException { return connection.getMetaData(); } @Override public void setReadOnly(boolean readOnly) throws SQLException { connection.setReadOnly(readOnly); } @Override public boolean isReadOnly() throws SQLException { return connection.isReadOnly(); } @Override public void setCatalog(String catalog) throws SQLException { connection.setCatalog(catalog); } @Override public String getCatalog() throws SQLException { return connection.getCatalog(); } @Override public void setTransactionIsolation(int level) throws SQLException { connection.setTransactionIsolation(level); } @Override public int getTransactionIsolation() throws SQLException { return connection.getTransactionIsolation(); } @Override public SQLWarning getWarnings() throws SQLException { return connection.getWarnings(); } @Override public void clearWarnings() throws SQLException { connection.clearWarnings(); } @Override public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException { return connection.createStatement(resultSetType, resultSetConcurrency); } @Override public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException { return connection.prepareStatement(sql, resultSetType, resultSetConcurrency); } @Override public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException { return connection.prepareCall(sql, resultSetType, resultSetConcurrency); } @Override public Map<String, Class<?>> getTypeMap() throws SQLException { return connection.getTypeMap(); } @Override public void setTypeMap(Map<String, Class<?>> map) throws SQLException { connection.setTypeMap(map); } @Override public void setHoldability(int holdability) throws SQLException { connection.setHoldability(holdability); } @Override public int getHoldability() throws SQLException { return connection.getHoldability(); } @Override public Savepoint setSavepoint() throws SQLException { return connection.setSavepoint(); } @Override public Savepoint setSavepoint(String name) throws SQLException { return connection.setSavepoint(name); } @Override public void rollback(Savepoint savepoint) throws SQLException { connection.rollback(savepoint); } @Override public void releaseSavepoint(Savepoint savepoint) throws SQLException { connection.releaseSavepoint(savepoint); } @Override public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { return connection.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability); } @Override public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { return connection.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability); } @Override public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { return connection.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability); } @Override public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException { return connection.prepareStatement(sql, autoGeneratedKeys); } @Override public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException { return connection.prepareStatement(sql, columnIndexes); } @Override public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException { return connection.prepareStatement(sql, columnNames); } @Override public Clob createClob() throws SQLException { return connection.createClob(); } @Override public Blob createBlob() throws SQLException { return connection.createBlob(); } @Override public NClob createNClob() throws SQLException { return connection.createNClob(); } @Override public SQLXML createSQLXML() throws SQLException { return connection.createSQLXML(); } @Override public boolean isValid(int timeout) throws SQLException { return connection.isValid(timeout); } @Override public void setClientInfo(String name, String value) throws SQLClientInfoException { connection.setClientInfo(name, value); } @Override public void setClientInfo(Properties properties) throws SQLClientInfoException { connection.setClientInfo(properties); } @Override public String getClientInfo(String name) throws SQLException { return connection.getClientInfo(name); } @Override public Properties getClientInfo() throws SQLException { return connection.getClientInfo(); } @Override public Array createArrayOf(String typeName, Object[] elements) throws SQLException { return connection.createArrayOf(typeName, elements); } @Override public Struct createStruct(String typeName, Object[] attributes) throws SQLException { return connection.createStruct(typeName, attributes); } @Override public void setSchema(String schema) throws SQLException { connection.setSchema(schema); } @Override public String getSchema() throws SQLException { return connection.getSchema(); } @Override public void abort(Executor executor) throws SQLException { connection.abort(executor); } @Override public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException { connection.setNetworkTimeout(executor, milliseconds); } @Override public int getNetworkTimeout() throws SQLException { return connection.getNetworkTimeout(); } @Override public <T> T unwrap(Class<T> iface) throws SQLException { return connection.unwrap(iface); } @Override public boolean isWrapperFor(Class<?> iface) throws SQLException { return connection.isWrapperFor(iface); } }