https://github.com/spring-projects/spring-framework: Spring Transaction (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2017 the original author or authors.
 *
 * 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.
 */

package org.springframework.jca.cci.connection;

import javax.resource.ResourceException;
import javax.resource.cci.Connection;
import javax.resource.cci.ConnectionFactory;
import javax.resource.cci.ConnectionSpec;

import org.springframework.core.NamedThreadLocal;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;


An adapter for a target CCI ConnectionFactory, applying the given ConnectionSpec to every standard getConnection() call, that is, implicitly invoking getConnection(ConnectionSpec) on the target. All other methods simply delegate to the corresponding methods of the target ConnectionFactory. 
Can be used to proxy a target JNDI ConnectionFactory that does not have a ConnectionSpec configured. Client code can work with the ConnectionFactory without passing in a ConnectionSpec on every getConnection() call. 
In the following example, client code can simply transparently work with
the preconfigured "myConnectionFactory", implicitly accessing
"myTargetConnectionFactory" with the specified user credentials.

<bean id="myTargetConnectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean">
  <property name="jndiName" value="java:comp/env/cci/mycf"/>
</bean>
<bean id="myConnectionFactory" class="org.springframework.jca.cci.connection.ConnectionSpecConnectionFactoryAdapter">
  <property name="targetConnectionFactory" ref="myTargetConnectionFactory"/>
  <property name="connectionSpec">
    <bean class="your.resource.adapter.ConnectionSpecImpl">
      <property name="username" value="myusername"/>
      <property name="password" value="mypassword"/>
    </bean>
  </property>
</bean>


If the "connectionSpec" is empty, this proxy will simply delegate to the standard getConnection() method of the target ConnectionFactory. This can be used to keep a UserCredentialsConnectionFactoryAdapter bean definition just for the option of implicitly passing in a ConnectionSpec if the
particular target ConnectionFactory requires it.

Author:Juergen Hoeller
See Also:
Since:1.2
/**
 * An adapter for a target CCI {@link javax.resource.cci.ConnectionFactory},
 * applying the given ConnectionSpec to every standard {@code getConnection()}
 * call, that is, implicitly invoking {@code getConnection(ConnectionSpec)}
 * on the target. All other methods simply delegate to the corresponding methods
 * of the target ConnectionFactory.
 *
 * <p>Can be used to proxy a target JNDI ConnectionFactory that does not have a
 * ConnectionSpec configured. Client code can work with the ConnectionFactory
 * without passing in a ConnectionSpec on every {@code getConnection()} call.
 *
 * <p>In the following example, client code can simply transparently work with
 * the preconfigured "myConnectionFactory", implicitly accessing
 * "myTargetConnectionFactory" with the specified user credentials.
 *
 * <pre class="code">
 * &lt;bean id="myTargetConnectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean"&gt;
 *   &lt;property name="jndiName" value="java:comp/env/cci/mycf"/&gt;
 * &lt;/bean>
 *
 * &lt;bean id="myConnectionFactory" class="org.springframework.jca.cci.connection.ConnectionSpecConnectionFactoryAdapter"&gt;
 *   &lt;property name="targetConnectionFactory" ref="myTargetConnectionFactory"/&gt;
 *   &lt;property name="connectionSpec"&gt;
 *     &lt;bean class="your.resource.adapter.ConnectionSpecImpl"&gt;
 *       &lt;property name="username" value="myusername"/&gt;
 *       &lt;property name="password" value="mypassword"/&gt;
 *     &lt;/bean&gt;
 *   &lt;/property&gt;
 * &lt;/bean&gt;</pre>
 *
 * <p>If the "connectionSpec" is empty, this proxy will simply delegate to the
 * standard {@code getConnection()} method of the target ConnectionFactory.
 * This can be used to keep a UserCredentialsConnectionFactoryAdapter bean definition
 * just for the <i>option</i> of implicitly passing in a ConnectionSpec if the
 * particular target ConnectionFactory requires it.
 *
 * @author Juergen Hoeller
 * @since 1.2
 * @see #getConnection
 */
@SuppressWarnings("serial")
public class ConnectionSpecConnectionFactoryAdapter extends DelegatingConnectionFactory {

	@Nullable
	private ConnectionSpec connectionSpec;

	private final ThreadLocal<ConnectionSpec> threadBoundSpec =
			new NamedThreadLocal<>("Current CCI ConnectionSpec");


	
Set the ConnectionSpec that this adapter should use for retrieving Connections.
Default is none.

/**
	 * Set the ConnectionSpec that this adapter should use for retrieving Connections.
	 * Default is none.
	 */
	public void setConnectionSpec(ConnectionSpec connectionSpec) {
		this.connectionSpec = connectionSpec;
	}

	
Set a ConnectionSpec for this proxy and the current thread. The given ConnectionSpec will be applied to all subsequent getConnection() calls on this ConnectionFactory proxy. 
This will override any statically specified "connectionSpec" property.

Params:
  • spec – the ConnectionSpec to apply
See Also:
/**
	 * Set a ConnectionSpec for this proxy and the current thread.
	 * The given ConnectionSpec will be applied to all subsequent
	 * {@code getConnection()} calls on this ConnectionFactory proxy.
	 * <p>This will override any statically specified "connectionSpec" property.
	 * @param spec the ConnectionSpec to apply
	 * @see #removeConnectionSpecFromCurrentThread
	 */
	public void setConnectionSpecForCurrentThread(ConnectionSpec spec) {
		this.threadBoundSpec.set(spec);
	}

	
Remove any ConnectionSpec for this proxy from the current thread.
A statically specified ConnectionSpec applies again afterwards.

See Also:
  • setConnectionSpecForCurrentThread
/**
	 * Remove any ConnectionSpec for this proxy from the current thread.
	 * A statically specified ConnectionSpec applies again afterwards.
	 * @see #setConnectionSpecForCurrentThread
	 */
	public void removeConnectionSpecFromCurrentThread() {
		this.threadBoundSpec.remove();
	}


	
Determine whether there is currently a thread-bound ConnectionSpec,
using it if available, falling back to the statically specified
"connectionSpec" property else.

See Also:
  • doGetConnection
/**
	 * Determine whether there is currently a thread-bound ConnectionSpec,
	 * using it if available, falling back to the statically specified
	 * "connectionSpec" property else.
	 * @see #doGetConnection
	 */
	@Override
	public final Connection getConnection() throws ResourceException {
		ConnectionSpec threadSpec = this.threadBoundSpec.get();
		if (threadSpec != null) {
			return doGetConnection(threadSpec);
		}
		else {
			return doGetConnection(this.connectionSpec);
		}
	}

	
This implementation delegates to the getConnection(ConnectionSpec) method of the target ConnectionFactory, passing in the specified user credentials. If the specified username is empty, it will simply delegate to the standard getConnection() method of the target ConnectionFactory. 
Params:
  • spec – the ConnectionSpec to apply
See Also:
Returns:the Connection
/**
	 * This implementation delegates to the {@code getConnection(ConnectionSpec)}
	 * method of the target ConnectionFactory, passing in the specified user credentials.
	 * If the specified username is empty, it will simply delegate to the standard
	 * {@code getConnection()} method of the target ConnectionFactory.
	 * @param spec the ConnectionSpec to apply
	 * @return the Connection
	 * @see javax.resource.cci.ConnectionFactory#getConnection(javax.resource.cci.ConnectionSpec)
	 * @see javax.resource.cci.ConnectionFactory#getConnection()
	 */
	protected Connection doGetConnection(@Nullable ConnectionSpec spec) throws ResourceException {
		ConnectionFactory connectionFactory = getTargetConnectionFactory();
		Assert.state(connectionFactory != null, "No 'targetConnectionFactory' set");
		return (spec != null ? connectionFactory.getConnection(spec) : connectionFactory.getConnection());
	}

}