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/*-
* ============LICENSE_START=======================================================
* openecomp
* ================================================================================
* Copyright (C) 2016 - 2017 AT&T
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
/*
* 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:
* <ul>
* <li>{@link java.sql.Connection#close()} - returns the connection to the pool. May be called multiple times.</li>
* <li>{@link java.lang.Object#toString()} - returns a custom string for this object</li>
* <li>{@link javax.sql.PooledConnection#getConnection()} - returns the underlying connection</li>
* </ul>
* By default method comparisons is done on a String reference level, unless the {@link PoolConfiguration#setUseEquals(boolean)} has been called
* with a <code>true</code> 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().equals(XAConnection.class)) {
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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