com.p6spy.engine.common.P6WrapperUnwrapDelegateTest.java Source code

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Here is the source code for com.p6spy.engine.common.P6WrapperUnwrapDelegateTest.java

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/*
 * #%L
 * P6Spy
 * %%
 * Copyright (C) 2013 P6Spy
 * %%
 * 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.
 * #L%
 */
package com.p6spy.engine.common;

import com.p6spy.engine.proxy.GenericInvocationHandler;
import com.p6spy.engine.proxy.ProxyFactory;
import com.p6spy.engine.test.AbstractTestConnection;
import com.p6spy.engine.test.BaseTestCase;
import com.p6spy.engine.test.TestConnection;
import com.p6spy.engine.test.TestConnectionImpl;
import org.apache.commons.dbcp.DelegatingConnection;
import org.junit.Test;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Wrapper;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

public class P6WrapperUnwrapDelegateTest extends BaseTestCase {

    @Test
    public void testCastableFromProxy() throws SQLException {
        Connection con = new TestConnectionImpl();
        Connection proxy = ProxyFactory.createProxy(con, new GenericInvocationHandler<Connection>(con));

        // if the proxy implements the interface then the proxy should be returned
        {
            Connection unwrapped = proxy.unwrap(Connection.class);
            assertTrue(ProxyFactory.isProxy(unwrapped));
        }

        {
            TestConnection unwrapped = proxy.unwrap(TestConnection.class);
            assertTrue(ProxyFactory.isProxy(unwrapped));
        }

        {
            Wrapper unwrapped = proxy.unwrap(Wrapper.class);
            assertTrue(ProxyFactory.isProxy(unwrapped));
        }

        {
            AutoCloseable unwrapped = proxy.unwrap(AutoCloseable.class);
            assertTrue(ProxyFactory.isProxy(unwrapped));
        }

        // TestConnectionImpl is not implemented by the proxy - proxy will not be returned
        {
            TestConnectionImpl unwrapped = proxy.unwrap(TestConnectionImpl.class);
            assertFalse(ProxyFactory.isProxy(unwrapped));
        }

    }

    @Test
    public void testCastableFromUnderlying() throws SQLException {
        Connection con = new TestConnectionImpl();
        Connection proxy = ProxyFactory.createProxy(con, new GenericInvocationHandler<Connection>(con));

        // if the underlying object extends the class (or matches the class) then the underlying object should be returned.
        {
            AbstractTestConnection unwrapped = proxy.unwrap(AbstractTestConnection.class);
            assertFalse(ProxyFactory.isProxy(unwrapped));
        }

        {
            TestConnectionImpl unwrapped = proxy.unwrap(TestConnectionImpl.class);
            assertFalse(ProxyFactory.isProxy(unwrapped));
        }

    }

    @Test
    public void testProxyOfWrappedConnection() throws SQLException {
        // this will be the actual connection
        Connection con = new TestConnectionImpl();

        // use a wrapper from DBCP to create a proxy of a proxy
        // Note: DBCP implements with JDBC 4.0 API so the Wrapper interface
        // is implemented here.
        DelegatingConnection underlying = new DelegatingConnection(con);

        Connection proxy = ProxyFactory.createProxy(underlying,
                new GenericInvocationHandler<Connection>(underlying));

        // TestConnection is an interface of the actual connection but not of the proxy.  Unwrapping works
        // but a proxy is not returned
        {
            TestConnection unwrapped = proxy.unwrap(TestConnection.class);
            assertFalse(ProxyFactory.isProxy(unwrapped));
        }

        // ResultSet is not implemented at all - an exception will be thrown
        try {
            proxy.unwrap(ResultSet.class);
            fail("Expected exception not thrown");
        } catch (SQLException e) {
        }

    }

}