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

import javax.sql.XAConnection;
/**
 * A ProxyConnection object is the bottom most interceptor that wraps an object of type
 * {@link PooledConnection}. The ProxyConnection intercepts three methods:
 * 
    *
  • {@link java.sql.Connection#close()} - returns the connection to the pool. May be called multiple times.
  • *
  • {@link java.lang.Object#toString()} - returns a custom string for this object
  • *
  • {@link javax.sql.PooledConnection#getConnection()} - returns the underlying connection
  • *
* 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 ProxyConnection extends JdbcInterceptor { protected PooledConnection connection = null; protected ConnectionPool pool = null; public PooledConnection getConnection() { return connection; } public void setConnection(PooledConnection connection) { this.connection = connection; } public ConnectionPool getPool() { return pool; } public void setPool(ConnectionPool pool) { this.pool = pool; } protected ProxyConnection(ConnectionPool parent, PooledConnection con, boolean useEquals) { pool = parent; connection = con; setUseEquals(useEquals); } @Override public void reset(ConnectionPool parent, PooledConnection con) { this.pool = parent; this.connection = con; } public boolean isWrapperFor(Class iface) { if (iface == XAConnection.class && connection.getXAConnection()!=null) { return true; } else { return iface.isInstance(connection.getConnection()); } } public Object unwrap(Class iface) throws SQLException { if (iface == PooledConnection.class) { return connection; }else if (iface == XAConnection.class) { return connection.getXAConnection(); } else if (isWrapperFor(iface)) { return connection.getConnection(); } else { throw new SQLException("Not a wrapper of "+iface.getName()); } } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if (compare(ISCLOSED_VAL,method)) { return Boolean.valueOf(isClosed()); } if (compare(CLOSE_VAL,method)) { if (connection==null) { return null; //noop for already closed. } PooledConnection poolc = this.connection; this.connection = null; pool.returnConnection(poolc); return null; } else if (compare(TOSTRING_VAL,method)) { return this.toString(); } else if (compare(GETCONNECTION_VAL,method) && connection!=null) { return connection.getConnection(); } else if (method.getDeclaringClass().isAssignableFrom(XAConnection.class) && connection != null) { try { return method.invoke(connection.getXAConnection(),args); }catch (Throwable t) { if (t instanceof InvocationTargetException) { throw t.getCause() != null ? t.getCause() : t; } else { throw t; } } } if (isClosed()) { throw new SQLException("Connection has already been closed."); } if (compare(UNWRAP_VAL,method)) { return unwrap((Class)args[0]); } else if (compare(ISWRAPPERFOR_VAL,method)) { return Boolean.valueOf(this.isWrapperFor((Class)args[0])); } try { PooledConnection poolc = connection; if (poolc!=null) { return method.invoke(poolc.getConnection(),args); } else { throw new SQLException("Connection has already been closed."); } }catch (Throwable t) { if (t instanceof InvocationTargetException) { throw t.getCause() != null ? t.getCause() : t; } else { throw t; } } } public boolean isClosed() { return connection==null || connection.isDiscarded(); } public PooledConnection getDelegateConnection() { return connection; } public ConnectionPool getParentPool() { return pool; } @Override public String toString() { return "ProxyConnection["+(connection!=null?connection.toString():"null")+"]"; } }




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