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/*
 * 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.tomcat.jdbc.pool;

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.SQLException;

/**
 * A DisposableConnectionFacade object is the top most interceptor that wraps an
 * object of type {@link PooledConnection}. The DisposableConnectionFacade intercepts
 * two methods:
 * 
    *
  • {@link java.sql.Connection#close()} - returns the connection to the * pool then breaks the link between cutoff and the next interceptor. * May be called multiple times.
  • *
  • {@link java.lang.Object#toString()} - returns a custom string for this * object
  • *
* By default method comparisons is done on a String reference level, unless the * {@link PoolConfiguration#setUseEquals(boolean)} has been called with a * true argument. */ public class DisposableConnectionFacade extends JdbcInterceptor { protected DisposableConnectionFacade(JdbcInterceptor interceptor) { setUseEquals(interceptor.isUseEquals()); setNext(interceptor); } @Override public void reset(ConnectionPool parent, PooledConnection con) { } @Override public int hashCode() { return System.identityHashCode(this); } @Override public boolean equals(Object obj) { return this==obj; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if (compare(EQUALS_VAL, method)) { return Boolean.valueOf( this.equals(Proxy.getInvocationHandler(args[0]))); } else if (compare(HASHCODE_VAL, method)) { return Integer.valueOf(this.hashCode()); } else if (getNext()==null) { if (compare(ISCLOSED_VAL, method)) { return Boolean.TRUE; } else if (compare(CLOSE_VAL, method)) { return null; } else if (compare(ISVALID_VAL, method)) { return Boolean.FALSE; } } try { return super.invoke(proxy, method, args); } catch (NullPointerException e) { if (getNext() == null) { if (compare(TOSTRING_VAL, method)) { return "DisposableConnectionFacade[null]"; } throw new SQLException( "PooledConnection has already been closed."); } throw e; } finally { if (compare(CLOSE_VAL, method)) { setNext(null); } } } }




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