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94 lines
3.6 KiB
Java
94 lines
3.6 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.server;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.base.Throwables.throwIfInstanceOf;
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import static google.registry.util.TypeUtils.instantiate;
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import com.google.common.collect.ImmutableList;
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import com.google.common.util.concurrent.Uninterruptibles;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.Queue;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.FutureTask;
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import javax.annotation.Nullable;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* Servlet that wraps a servlet and delegates request execution to a queue.
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*
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* <p>The actual invocation of the delegate does not happen within this servlet's lifecycle.
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* Therefore, the task on the queue must manually invoke filters within the queue task.
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*
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* @see TestServer
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*/
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public final class ServletWrapperDelegatorServlet extends HttpServlet {
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private final Queue<FutureTask<Void>> requestQueue;
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private final Class<? extends HttpServlet> servletClass;
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private final ImmutableList<Class<? extends Filter>> filterClasses;
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ServletWrapperDelegatorServlet(
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Class<? extends HttpServlet> servletClass,
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ImmutableList<Class<? extends Filter>> filterClasses,
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Queue<FutureTask<Void>> requestQueue) {
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this.servletClass = servletClass;
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this.filterClasses = filterClasses;
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this.requestQueue = checkNotNull(requestQueue, "requestQueue");
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}
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@Override
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public void service(final HttpServletRequest req, final HttpServletResponse rsp)
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throws ServletException, IOException {
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FutureTask<Void> task = new FutureTask<>(new Callable<Void>() {
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@Nullable
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@Override
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public Void call() throws ServletException, IOException {
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// Simulate the full filter chain with the servlet at the end.
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final Iterator<Class<? extends Filter>> filtersIter = filterClasses.iterator();
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FilterChain filterChain =
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new FilterChain() {
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@Override
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public void doFilter(ServletRequest request, ServletResponse response)
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throws IOException, ServletException {
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if (filtersIter.hasNext()) {
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instantiate(filtersIter.next()).doFilter(request, response, this);
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} else {
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instantiate(servletClass).service(request, response);
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}
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}};
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filterChain.doFilter(req, rsp);
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return null;
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}});
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requestQueue.add(task);
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try {
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Uninterruptibles.getUninterruptibly(task);
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} catch (ExecutionException e) {
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throwIfInstanceOf(e.getCause(), ServletException.class);
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throwIfInstanceOf(e.getCause(), IOException.class);
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throw new RuntimeException(e.getCause());
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}
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}
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}
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