advisedsupport.java

一个关于Spring框架的示例应用程序,简单使用,可以参考.

	 * @see #addAdvice(org.aopalliance.aop.Advice)
	 * @see Advised#addBeforeAdvice
	 */
	public void addBeforeAdvice(MethodBeforeAdvice ba) throws AopConfigException {
		addAdvisor(new DefaultPointcutAdvisor(Pointcut.TRUE, ba));
	}
	
	/**
	 * @deprecated in favor of addAdvice
	 * @see #addAdvice(org.aopalliance.aop.Advice)
	 * @see Advised#addThrowsAdvice
	 */
	public void addThrowsAdvice(ThrowsAdvice throwsAdvice) throws AopConfigException {
		addAdvisor(new DefaultPointcutAdvisor(throwsAdvice));
	}
	
	/**
	 * Return the index (from 0) of the given AOP Alliance interceptor,
	 * or -1 if no such interceptor is an advice for this proxy.
	 * The return value of this method can be used to index into
	 * the Advisors array.
	 * @param interceptor AOP Alliance interceptor to search for
	 * @return index from 0 of this interceptor, or -1 if there's
	 * no such advice.
	 * @deprecated in favor of indexOf(Advice)
	 * @see #indexOf(org.aopalliance.aop.Advice)
	 */
	public int indexOf(Interceptor interceptor) {
		// Invoke generic form of this method that's recommended
		// post 1.0.3
		return indexOf((Advice) interceptor);
	}
	
	/**
	 * Return the index (from 0) of the given AOP Alliance Advice,
	 * or -1 if no such advice is an advice for this proxy.
	 * The return value of this method can be used to index into
	 * the Advisors array.
	 * @param advice AOP Alliance advice to search for
	 * @return index from 0 of this advice, or -1 if there's
	 * no such advice.
	 */
	public int indexOf(Advice advice) {
		for (int i = 0; i < this.advisors.size(); i++) {
			Advisor advisor = (Advisor) this.advisors.get(i);
			if (advisor.getAdvice() == advice) {
				return i;
			}
		}
		return -1;
	}
	
	/**
	 * Return the index (from 0) of the given advisor,
	 * or -1 if no such advisor applies to this proxy.
	 * The return value of this method can be used to index into
	 * the Advisors array.
	 * @param advisor advisor to search for
	 * @return index from 0 of this advisor, or -1 if there's
	 * no such advisor.
	 */
	public int indexOf(Advisor advisor) {
		return this.advisors.indexOf(advisor);
	}

	public final boolean removeAdvisor(Advisor advisor) {
		int index = indexOf(advisor);
		if (index == -1) {
			return false;
		}
		else {
			removeAdvisor(index);
			return true;
		}
	}
	
	public void removeAdvisor(int index) throws AopConfigException {
		if (isFrozen()) {
			throw new AopConfigException("Cannot remove Advisor: config is frozen");
		}
		if (index < 0 || index > this.advisors.size() - 1) {
			throw new AopConfigException("Advisor index " + index + " is out of bounds: " +
					"Only have " + this.advisors.size() + " advisors");
		}

		Advisor advisor = (Advisor) this.advisors.get(index);
		if (advisor instanceof IntroductionAdvisor) {
			IntroductionAdvisor ia = (IntroductionAdvisor) advisor;
			// we need to remove interfaces
			for (int j = 0; j < ia.getInterfaces().length; j++) {
				removeInterface(ia.getInterfaces()[j]);
			}
		}
		
		this.advisors.remove(index);
		updateAdvisorArray();
		adviceChanged();
	}

	private void addAdvisorInternal(int pos, Advisor advice) throws AopConfigException {
		if (isFrozen()) {
			throw new AopConfigException("Cannot add advisor: config is frozen");
		}
		if (pos > this.advisors.size()) {
			throw new IllegalArgumentException(
					"Illegal position " + pos + " in advisor list with size " + this.advisors.size());
		}
		this.advisors.add(pos, advice);
		updateAdvisorArray();
		adviceChanged();
	}
	
	public void addAdvisor(int pos, IntroductionAdvisor advisor) throws AopConfigException {
		advisor.validateInterfaces();
		
		// if the advisor passed validation we can make the change
		for (int i = 0; i < advisor.getInterfaces().length; i++) {
			addInterface(advisor.getInterfaces()[i]);
		}
		addAdvisorInternal(pos, advisor);
	}

	public void addAdvisor(int pos, Advisor advisor) throws AopConfigException {
		if (advisor instanceof IntroductionAdvisor) {
			addAdvisor(pos, (IntroductionAdvisor) advisor);
		}
		else {
			addAdvisorInternal(pos, advisor);
		}
	}
	
	public void addAdvisor(Advisor advisor) {
		int pos = this.advisors.size();
		addAdvisor(pos, advisor);
	}

	/**
	 * Bring the array up to date with the list.
	 */
	private void updateAdvisorArray() {
		this.advisorArray = (Advisor[]) this.advisors.toArray(new Advisor[this.advisors.size()]);
	}
	
	public final Advisor[] getAdvisors() {
		return this.advisorArray;
	}

	/**
	 * Replace the given advisor.
	 * <p><b>NB:</b> If the advisor is an IntroductionAdvisor
	 * and the replacement is not or implements different interfaces,
	 * the proxy will need to be re-obtained or the old interfaces
	 * won't be supported and the new interface won't be implemented.
	 * @param a advisor to replace
	 * @param b advisor to replace it with
	 * @return whether it was replaced. If the advisor wasn't found in the
	 * list of advisors, this method returns false and does nothing.
	 */
	public final boolean replaceAdvisor(Advisor a, Advisor b) throws AopConfigException {
		int index = indexOf(a);
		if (index == -1 || b == null) {
			return false;
		}
		removeAdvisor(index);
		addAdvisor(index, b);
		return true;
	}

	/**
	 * Is this interceptor included in any advisor?
	 * @param mi interceptor to check inclusion of
	 * @return whether this interceptor instance could be run in an invocation
	 * @deprecated in favor of adviceIncluded
	 * @see #adviceIncluded
	 */
	public final boolean interceptorIncluded(Interceptor mi) {
		return adviceIncluded(mi);
	}
	
	/**
	 * Is this advice included in any advisor?
	 * @param advice advice to check inclusion of
	 * @return whether this advice instance could be run in an invocation
	 */
	public final boolean adviceIncluded(Advice advice) {
		if (this.advisors.size() == 0) {
			return false;
		}
		for (int i = 0; i < this.advisors.size(); i++) {
			Advisor advisor = (Advisor) this.advisors.get(i);
			if (advisor.getAdvice() == advice) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Count interceptors of the given class.
	 * @param interceptorClass class of the interceptor to check
	 * @return the count of the interceptors of this class or subclasses
	 * @deprecated in favor of countAdvicesOfType
	 * @see #countAdvicesOfType
	 */
	public final int countInterceptorsOfType(Class interceptorClass) {
		return countAdvicesOfType(interceptorClass);
	}
	
	/**
	 * Count advices of the given class
	 * @param interceptorClass class of the interceptor to check
	 * @return the count of the interceptors of this class or subclasses
	 */
	public final int countAdvicesOfType(Class interceptorClass) {
		if (this.advisors.size() == 0) {
			return 0;
		}
		int count = 0;
		for (int i = 0; i < this.advisors.size(); i++) {
			Advisor advisor = (Advisor) this.advisors.get(i);
			if (interceptorClass.isAssignableFrom(advisor.getAdvice().getClass())) {
				++count;
			}
		}
		return count;
	}
	
	/**
	 * Invoked when advice has changed.
	 */
	private synchronized void adviceChanged() {
		if (this.isActive) {
			for (int i = 0; i < this.listeners.size(); i++) {
				((AdvisedSupportListener) this.listeners.get(i)).adviceChanged(this);
			}
		}
	}
	
	private void activate() {
		this.isActive = true;
		for (int i = 0; i < this.listeners.size(); i++) {
			((AdvisedSupportListener) this.listeners.get(i)).activated(this);
		}
	}

	/**
	 * Subclasses should call this to get a new AOP proxy. They should <b>not</b>
	 * create an AOP proxy with this as an argument.
	 */
	protected synchronized AopProxy createAopProxy() {
		if (!this.isActive) {
			activate();
		}
		return getAopProxyFactory().createAopProxy(this);
	}
	
	/**
	 * Subclasses can call this to check whether any AOP proxies have been created yet.
	 */
	protected final boolean isActive() {
		return isActive;
	}
	

	//---------------------------------------------------------------------
	// Serialization support
	//---------------------------------------------------------------------
	
	/**
	 * Serialize a copy of the state of this class, ignoring
	 * subclass state.
	 */
	protected Object writeReplace() throws ObjectStreamException {
		if (logger.isDebugEnabled()) {
			logger.debug("Disconnecting " + this);
		}

		// Copy state to avoid dependencies
		// on BeanFactories etc. that subclasses may have.
		AdvisedSupport copy = this;

		// If we're in a non-serializable subclass,
		// copy into an AdvisedSupport object.
		if (getClass() != AdvisedSupport.class) {
			copy = new AdvisedSupport();
			copy.copyConfigurationFrom(this);
		}

		// may return this
		return copy;
	}
	 
	/**
	 * Used to initialize transient state.
	 */
	protected Object readResolve() throws ObjectStreamException {
		// initialize transient fields
		this.logger = LogFactory.getLog(getClass());
		this.isActive = true;
		this.listeners = new LinkedList();
		initDefaultAdvisorChainFactory();
		return this;
	}
	
	
	public String toProxyConfigString() {
		return toString();
	}

	/**
	 * For debugging/diagnostic use.
	 */
	public String toString() {
		StringBuffer sb = new StringBuffer(getClass().getName() + ": ");
		sb.append(this.interfaces.size()).append(" interfaces=[");
		sb.append(AopUtils.interfacesString(interfaces));
		sb.append("]; ");
		sb.append(this.advisors.size()).append(" advisors=[");
		sb.append(StringUtils.collectionToDelimitedString(this.advisors, ",", "{", "}")).append("]; ");
		sb.append("targetSource=[").append(this.targetSource).append("]; ");
		sb.append(super.toString());
		sb.append("advisorChainFactory=").append(this.advisorChainFactory);
		return sb.toString();
	}

}