Commons DBCP example source code file (TestDelegatingConnection.java)

This example Commons DBCP source code file (TestDelegatingConnection.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons DBCP tags/keywords

connection, delegatingconnection, delegatingconnection, exception, exception, expecting, expecting, jdbc, poolingconnection, rtegeneratingconnection, sql, sqlexception, sqlexception, string, testdelegatingconnection, testerconnection

The Commons DBCP TestDelegatingConnection.java source code

/*
 * 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.commons.dbcp;

import java.sql.Connection;
import java.sql.SQLException;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.apache.commons.pool.impl.GenericKeyedObjectPool;

/**
 * @author Dirk Verbeeck
 * @version $Revision: 883414 $ $Date: 2009-11-23 12:03:51 -0500 (Mon, 23 Nov 2009) $
 */
public class TestDelegatingConnection extends TestCase {
    public TestDelegatingConnection(String testName) {
        super(testName);
    }

    public static Test suite() {
        return new TestSuite(TestDelegatingConnection.class);
    }

    private DelegatingConnection conn = null;
    private Connection delegateConn = null;
    private Connection delegateConn2 = null;

    public void setUp() throws Exception {
        delegateConn = new TesterConnection("test", "test");
        delegateConn2 = new TesterConnection("test", "test");
        conn = new DelegatingConnection(delegateConn);
    }


    public void testGetDelegate() throws Exception {
        assertEquals(delegateConn,conn.getDelegate());
    }

    public void testConnectionToString() throws Exception {
        String s = conn.toString();
        assertNotNull(s);
        assertTrue(s.length() > 0);
    }

    public void testHashCodeEqual() {
        DelegatingConnection conn2 = new DelegatingConnection(delegateConn);
        assertEquals(conn.hashCode(), conn2.hashCode());
    }

    public void testHashCodeNotEqual() {
        DelegatingConnection conn2 = new DelegatingConnection(delegateConn2);
        assertTrue(conn.hashCode() != conn2.hashCode());
    }
    
    public void testEquals() {
        DelegatingConnection conn2 = new DelegatingConnection(delegateConn);
        DelegatingConnection conn3 = new DelegatingConnection(null);
        
        assertTrue(!conn.equals(null));
        assertTrue(conn.equals(conn2));
        assertTrue(!conn.equals(conn3));
        assertTrue(conn.equals(conn));
    }
    
    public void testCheckOpen() throws Exception {
        conn.checkOpen();
        conn.close();
        try {
            conn.checkOpen();
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            // expected
        }      
    }
    
    /**
     * Verify fix for DBCP-241
     */
    public void testCheckOpenNull() throws Exception {
        try {
            conn.close();
            conn.checkOpen();
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            assertTrue(ex.getMessage().endsWith("is closed."));
        }

        try {
            conn = new DelegatingConnection(null);
            conn._closed = true;  
            conn.checkOpen();
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            assertTrue(ex.getMessage().endsWith("is null."));
        }

        try {
            PoolingConnection pc = new PoolingConnection
                (delegateConn2, new GenericKeyedObjectPool());
            conn = new DelegatingConnection(pc);
            pc.close();
            conn.close();
            conn.prepareStatement("");
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            assertTrue(ex.getMessage().endsWith("is closed."));
        }  
        
        try {
            conn = new DelegatingConnection(new RTEGeneratingConnection());
            conn.close();
            conn.checkOpen();
            fail("Expecting SQLException");
        } catch (SQLException ex) {
            assertTrue(ex.getMessage().endsWith("is closed."));
        }
    }
    
    /**
     * Delegate that will throw RTE on toString
     * Used to validate fix for DBCP-241
     */
    static class RTEGeneratingConnection extends TesterConnection {
        public RTEGeneratingConnection() {
            super("","");
        }
        public String toString() {
            throw new RuntimeException("bang!");
        }
        
    }
}