org.apache.sshd.common.util.closeable.NioChannelDelegateInvocationHandler Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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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.sshd.common.util.closeable;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.nio.channels.Channel;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ProxyUtils;
import org.apache.sshd.common.util.logging.LoggingUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Wraps a target instance and a {@link Channel} delegate into a proxy instance that closes both when wrapper
* {@link AutoCloseable#close() close} method called. The {@link Channel#isOpen()} call is invoked only on the delegate
*
* @author Apache MINA SSHD Project
*/
public class NioChannelDelegateInvocationHandler extends AutoCloseableDelegateInvocationHandler {
public NioChannelDelegateInvocationHandler(Object proxyTarget, Channel delegate) {
super(proxyTarget, delegate);
}
public Channel getChannelDelegate() {
return Channel.class.cast(super.getAutoCloseableDelegate());
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (!isQueryOpenMethodInvocation(method, args)) {
return super.invoke(proxy, method, args);
}
Channel channelDelegate = getChannelDelegate();
try {
return method.invoke(channelDelegate, args);
} catch (Throwable t) {
Class targetType = channelDelegate.getClass();
Logger log = LoggerFactory.getLogger(targetType);
LoggingUtils.debug(log, "invoke({}#{}) failed ({}) to execute: {}",
targetType.getSimpleName(), method.getName(), t.getClass().getSimpleName(), t.getMessage(), t);
throw ProxyUtils.unwrapInvocationThrowable(t);
}
}
/**
* Wraps a target instance and a {@link Channel} delegate into a proxy instance that closes both when wrapper
* {@link Channel#close() close} method called. The {@link Channel#isOpen()} call is invoked only on the delegate
*
* @param The generic {@link Channel} wrapping interface
* @param proxyTarget The (never {@code null}) target instance - if not {@link AutoCloseable} then it's
* {@code close()} method will not be invoked (i.e., only the delegate)
* @param type The target wrapping interface
* @param delegate The (never {@code null}) delegate to use. Note: the delegate is closed after
* the target instance.
* @return The wrapping proxy
*/
public static T wrapDelegateChannel(
Object proxyTarget, Class type, Channel delegate) {
return ProxyUtils.newProxyInstance(type, new NioChannelDelegateInvocationHandler(proxyTarget, delegate));
}
public static boolean isQueryOpenMethodInvocation(Method m, Object[] args) {
return isQueryOpenMethodInvocation(m) && GenericUtils.isEmpty(args);
}
public static boolean isQueryOpenMethodInvocation(Method m) {
int mods = (m == null) ? 0 : m.getModifiers();
return (m != null)
&& "isOpen".equals(m.getName())
&& Modifier.isPublic(mods)
&& (!Modifier.isStatic(mods))
&& (boolean.class == m.getReturnType())
&& GenericUtils.isEmpty(m.getParameterTypes());
}
}