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[DOXIA-711] Introduce SinkWrapper and according SinkWrapperFactory
Add a BufferingSinkProxyWrapper which buffers all calls on the underlying sink until it is flushed.
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112
doxia-core/src/main/java/org/apache/maven/doxia/parser/BufferingSinkProxyFactory.java
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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.maven.doxia.parser; | ||
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| import java.lang.reflect.InvocationHandler; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Proxy; | ||
| import java.util.LinkedList; | ||
| import java.util.Queue; | ||
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| import org.apache.maven.doxia.sink.Sink; | ||
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| /** | ||
| * Buffers all method calls on the wrapped Sink until the proxy sink's method {@link Sink#flush()} is called. | ||
| */ | ||
| public class BufferingSinkProxyFactory implements SinkWrapperFactory { | ||
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| private static final class MethodWithArguments { | ||
| private final Method method; | ||
| private final Object[] args; | ||
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| MethodWithArguments(Method method, Object[] args) { | ||
| super(); | ||
| this.method = method; | ||
| this.args = args; | ||
| } | ||
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| void invoke(Object object) { | ||
| try { | ||
| method.invoke(object, args); | ||
| } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { | ||
| throw new IllegalStateException("Could not call buffered method " + method, e); | ||
| } | ||
| } | ||
| } | ||
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| public interface BufferingSink extends Sink { | ||
| // just a marker interface | ||
| Sink getBufferedSink(); | ||
| } | ||
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| private static final class BufferingSinkProxy implements InvocationHandler { | ||
| private final Queue<MethodWithArguments> bufferedInvocations; | ||
| private final Sink delegate; | ||
| private static final Method FLUSH_METHOD; | ||
| private static final Method GET_BUFFERED_SINK_METHOD; | ||
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| static { | ||
| try { | ||
| FLUSH_METHOD = Sink.class.getMethod("flush"); | ||
| GET_BUFFERED_SINK_METHOD = BufferingSink.class.getMethod("getBufferedSink"); | ||
| } catch (NoSuchMethodException | SecurityException e) { | ||
| throw new IllegalStateException("Could not find flush method in Sink!", e); | ||
| } | ||
| } | ||
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| BufferingSinkProxy(Sink delegate) { | ||
| bufferedInvocations = new LinkedList<>(); | ||
| this.delegate = delegate; | ||
| } | ||
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| @Override | ||
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { | ||
| if (method.equals(FLUSH_METHOD)) { | ||
| bufferedInvocations.forEach(i -> i.invoke(delegate)); | ||
| bufferedInvocations.clear(); | ||
| } else if (method.equals(GET_BUFFERED_SINK_METHOD)) { | ||
| return delegate; | ||
| } else { | ||
| bufferedInvocations.add(new MethodWithArguments(method, args)); | ||
| } | ||
| return null; | ||
| } | ||
| } | ||
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| @Override | ||
| public Sink createWrapper(Sink delegate) { | ||
| BufferingSinkProxy proxy = new BufferingSinkProxy(delegate); | ||
| return (Sink) Proxy.newProxyInstance( | ||
| delegate.getClass().getClassLoader(), new Class<?>[] {BufferingSink.class}, proxy); | ||
| } | ||
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| public static BufferingSink castAsBufferingSink(Sink sink) { | ||
| if (sink instanceof BufferingSink) { | ||
| return (BufferingSink) sink; | ||
| } else { | ||
| throw new IllegalArgumentException("The given sink is no BufferingSink but a " + sink.getClass()); | ||
| } | ||
| } | ||
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| @Override | ||
| public int getPriority() { | ||
| return 0; | ||
| } | ||
| } |
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