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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
107 lines
3.8 KiB
Java
107 lines
3.8 KiB
Java
// Copyright 2016 The Domain Registry 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.request;
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import com.google.common.base.Function;
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import com.google.common.base.Optional;
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import com.google.common.base.Throwables;
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import com.google.common.collect.ImmutableSortedMap;
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import com.google.common.collect.Ordering;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.Map;
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import java.util.TreeMap;
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/**
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* Path prefix request router for Domain Registry.
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*
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* <p>See the documentation of {@link RequestHandler} for more information.
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*
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* <h3>Implementation Details</h3>
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*
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* <p>Request routing is O(logn) because {@link ImmutableSortedMap} performs a binary search over a
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* contiguous array, which makes it faster than a {@link TreeMap}. However a prefix trie search in
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* generated code would be the ideal approach.
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*/
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final class Router {
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static Router create(Iterable<Method> componentMethods) {
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return new Router(extractRoutesFromComponent(componentMethods));
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}
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private final ImmutableSortedMap<String, Route> routes;
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private Router(ImmutableSortedMap<String, Route> routes) {
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this.routes = routes;
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}
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/** Returns the appropriate action route for a request. */
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Optional<Route> route(String path) {
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Map.Entry<String, Route> floor = routes.floorEntry(path);
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if (floor != null) {
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if (floor.getValue().action().isPrefix()
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? path.startsWith(floor.getKey())
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: path.equals(floor.getKey())) {
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return Optional.of(floor.getValue());
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}
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}
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return Optional.absent();
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}
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private static
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ImmutableSortedMap<String, Route> extractRoutesFromComponent(Iterable<Method> methods) {
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ImmutableSortedMap.Builder<String, Route> routes =
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new ImmutableSortedMap.Builder<>(Ordering.natural());
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for (Method method : methods) {
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if (!isDaggerInstantiatorOfType(Runnable.class, method)) {
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continue;
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}
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Action action = method.getReturnType().getAnnotation(Action.class);
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if (action == null) {
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continue;
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}
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@SuppressWarnings("unchecked") // Safe due to previous checks.
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Route route =
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Route.create(action, (Function<Object, Runnable>) newInstantiator(method));
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routes.put(action.path(), route);
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}
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return routes.build();
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}
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private static boolean isDaggerInstantiatorOfType(Class<?> type, Method method) {
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return method.getParameterTypes().length == 0
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&& type.isAssignableFrom(method.getReturnType());
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}
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private static Function<Object, ?> newInstantiator(final Method method) {
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return new Function<Object, Object>() {
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@Override
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public Object apply(Object component) {
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try {
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return method.invoke(component);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(
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"Error reflectively accessing component's @Action factory method", e);
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} catch (InvocationTargetException e) {
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// This means an exception was thrown during the injection process while instantiating
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// the @Action class; we should propagate that underlying exception.
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Throwables.propagateIfPossible(e.getCause());
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throw new AssertionError(
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"Component's @Action factory method somehow threw checked exception", e);
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}
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}};
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}
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}
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