| /* |
| * Copyright 2016, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package io.grpc; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNull; |
| import static org.junit.Assert.assertSame; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| import static org.mockito.Mockito.mock; |
| |
| import io.grpc.internal.DnsNameResolverProvider; |
| import java.net.URI; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.ServiceConfigurationError; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for {@link NameResolverProvider}. */ |
| @RunWith(JUnit4.class) |
| public class NameResolverProviderTest { |
| private final String serviceFile = "META-INF/services/io.grpc.NameResolverProvider"; |
| private final URI uri = URI.create("dns:///localhost"); |
| private final Attributes attributes = Attributes.EMPTY; |
| |
| @Test |
| public void noProvider() { |
| ClassLoader cl = new ReplacingClassLoader( |
| getClass().getClassLoader(), serviceFile, |
| "io/grpc/NameResolverProviderTest-doesNotExist.txt"); |
| List<NameResolverProvider> providers = NameResolverProvider.load(cl); |
| assertEquals(Collections.<NameResolverProvider>emptyList(), providers); |
| } |
| |
| @Test |
| public void multipleProvider() { |
| ClassLoader cl = new ReplacingClassLoader( |
| getClass().getClassLoader(), serviceFile, |
| "io/grpc/NameResolverProviderTest-multipleProvider.txt"); |
| List<NameResolverProvider> providers = NameResolverProvider.load(cl); |
| assertEquals(3, providers.size()); |
| assertSame(Available7Provider.class, providers.get(0).getClass()); |
| assertSame(Available5Provider.class, providers.get(1).getClass()); |
| assertSame(Available0Provider.class, providers.get(2).getClass()); |
| assertEquals("schemeAvailable7Provider", |
| NameResolverProvider.asFactory(providers).getDefaultScheme()); |
| assertSame(Available7Provider.nameResolver, |
| NameResolverProvider.asFactory(providers).newNameResolver(uri, attributes)); |
| } |
| |
| @Test |
| public void unavailableProvider() { |
| ClassLoader cl = new ReplacingClassLoader( |
| getClass().getClassLoader(), serviceFile, |
| "io/grpc/NameResolverProviderTest-unavailableProvider.txt"); |
| assertEquals(Collections.<NameResolverProvider>emptyList(), NameResolverProvider.load(cl)); |
| } |
| |
| @Test |
| public void getDefaultScheme_noProvider() { |
| List<NameResolverProvider> providers = Collections.<NameResolverProvider>emptyList(); |
| NameResolver.Factory factory = NameResolverProvider.asFactory(providers); |
| try { |
| factory.getDefaultScheme(); |
| fail("Expected exception"); |
| } catch (IllegalStateException ex) { |
| assertTrue(ex.toString(), ex.getMessage().contains("No NameResolverProviders found")); |
| } |
| } |
| |
| @Test |
| public void newNameResolver_providerReturnsNull() { |
| List<NameResolverProvider> providers = Collections.<NameResolverProvider>singletonList( |
| new BaseProvider(true, 5) { |
| @Override |
| public NameResolver newNameResolver(URI passedUri, Attributes passedAttributes) { |
| assertSame(uri, passedUri); |
| assertSame(attributes, passedAttributes); |
| return null; |
| } |
| }); |
| assertNull(NameResolverProvider.asFactory(providers).newNameResolver(uri, attributes)); |
| } |
| |
| @Test |
| public void newNameResolver_noProvider() { |
| List<NameResolverProvider> providers = Collections.<NameResolverProvider>emptyList(); |
| NameResolver.Factory factory = NameResolverProvider.asFactory(providers); |
| try { |
| factory.newNameResolver(uri, attributes); |
| fail("Expected exception"); |
| } catch (IllegalStateException ex) { |
| assertTrue(ex.toString(), ex.getMessage().contains("No NameResolverProviders found")); |
| } |
| } |
| |
| @Test |
| public void baseProviders() { |
| List<NameResolverProvider> providers = NameResolverProvider.providers(); |
| assertEquals(1, providers.size()); |
| assertSame(DnsNameResolverProvider.class, providers.get(0).getClass()); |
| assertEquals("dns", NameResolverProvider.asFactory().getDefaultScheme()); |
| } |
| |
| @Test |
| public void getCandidatesViaHardCoded_usesProvidedClassLoader() { |
| final RuntimeException toThrow = new RuntimeException(); |
| try { |
| NameResolverProvider.getCandidatesViaHardCoded(new ClassLoader() { |
| @Override |
| public Class<?> loadClass(String name) { |
| throw toThrow; |
| } |
| }); |
| fail("Expected exception"); |
| } catch (RuntimeException ex) { |
| assertSame(toThrow, ex); |
| } |
| } |
| |
| @Test |
| public void getCandidatesViaHardCoded_ignoresMissingClasses() { |
| Iterable<NameResolverProvider> i = |
| NameResolverProvider.getCandidatesViaHardCoded(new ClassLoader() { |
| @Override |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| throw new ClassNotFoundException(); |
| } |
| }); |
| assertFalse("Iterator should be empty", i.iterator().hasNext()); |
| } |
| |
| @Test |
| public void create_throwsErrorOnMisconfiguration() throws Exception { |
| class PrivateClass {} |
| |
| try { |
| NameResolverProvider.create(PrivateClass.class); |
| fail("Expected exception"); |
| } catch (ServiceConfigurationError e) { |
| assertTrue("Expected ClassCastException cause: " + e.getCause(), |
| e.getCause() instanceof ClassCastException); |
| } |
| } |
| |
| private static class BaseProvider extends NameResolverProvider { |
| private final boolean isAvailable; |
| private final int priority; |
| |
| public BaseProvider(boolean isAvailable, int priority) { |
| this.isAvailable = isAvailable; |
| this.priority = priority; |
| } |
| |
| @Override |
| protected boolean isAvailable() { |
| return isAvailable; |
| } |
| |
| @Override |
| protected int priority() { |
| return priority; |
| } |
| |
| @Override |
| public NameResolver newNameResolver(URI targetUri, Attributes params) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String getDefaultScheme() { |
| return "scheme" + getClass().getSimpleName(); |
| } |
| } |
| |
| public static class Available0Provider extends BaseProvider { |
| public Available0Provider() { |
| super(true, 0); |
| } |
| } |
| |
| public static class Available5Provider extends BaseProvider { |
| public Available5Provider() { |
| super(true, 5); |
| } |
| } |
| |
| public static class Available7Provider extends BaseProvider { |
| public static final NameResolver nameResolver = mock(NameResolver.class); |
| |
| public Available7Provider() { |
| super(true, 7); |
| } |
| |
| @Override |
| public NameResolver newNameResolver(URI targetUri, Attributes params) { |
| return nameResolver; |
| } |
| } |
| |
| public static class UnavailableProvider extends BaseProvider { |
| public UnavailableProvider() { |
| super(false, 10); |
| } |
| |
| @Override |
| protected int priority() { |
| throw new RuntimeException("purposefully broken"); |
| } |
| } |
| } |
| |