/
ManagedChannelRegistryTest.java
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/
ManagedChannelRegistryTest.java
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/*
* Copyright 2020 The gRPC Authors
*
* Licensed 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 io.grpc;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Unit tests for {@link ManagedChannelRegistry}. */
@RunWith(JUnit4.class)
public class ManagedChannelRegistryTest {
private String target = "testing123";
private ChannelCredentials creds = new ChannelCredentials() {};
@Test
public void register_unavailableProviderThrows() {
ManagedChannelRegistry reg = new ManagedChannelRegistry();
try {
reg.register(new BaseProvider(false, 5));
fail("Should throw");
} catch (IllegalArgumentException e) {
assertThat(e).hasMessageThat().contains("isAvailable() returned false");
}
assertThat(reg.providers()).isEmpty();
}
@Test
public void deregister() {
ManagedChannelRegistry reg = new ManagedChannelRegistry();
ManagedChannelProvider p1 = new BaseProvider(true, 5);
ManagedChannelProvider p2 = new BaseProvider(true, 5);
ManagedChannelProvider p3 = new BaseProvider(true, 5);
reg.register(p1);
reg.register(p2);
reg.register(p3);
assertThat(reg.providers()).containsExactly(p1, p2, p3).inOrder();
reg.deregister(p2);
assertThat(reg.providers()).containsExactly(p1, p3).inOrder();
}
@Test
public void provider_sorted() {
ManagedChannelRegistry reg = new ManagedChannelRegistry();
ManagedChannelProvider p1 = new BaseProvider(true, 5);
ManagedChannelProvider p2 = new BaseProvider(true, 3);
ManagedChannelProvider p3 = new BaseProvider(true, 8);
ManagedChannelProvider p4 = new BaseProvider(true, 3);
ManagedChannelProvider p5 = new BaseProvider(true, 8);
reg.register(p1);
reg.register(p2);
reg.register(p3);
reg.register(p4);
reg.register(p5);
assertThat(reg.providers()).containsExactly(p3, p5, p1, p2, p4).inOrder();
}
@Test
public void getProvider_noProvider() {
assertThat(new ManagedChannelRegistry().provider()).isNull();
}
@Test
public void newChannelBuilder_providerReturnsError() {
final String errorString = "brisking";
class ErrorProvider extends BaseProvider {
ErrorProvider() {
super(true, 5);
}
@Override
public NewChannelBuilderResult newChannelBuilder(
String passedTarget, ChannelCredentials passedCreds) {
assertThat(passedTarget).isSameInstanceAs(target);
assertThat(passedCreds).isSameInstanceAs(creds);
return NewChannelBuilderResult.error(errorString);
}
}
ManagedChannelRegistry registry = new ManagedChannelRegistry();
registry.register(new ErrorProvider());
try {
registry.newChannelBuilder(target, creds);
fail("expected exception");
} catch (ManagedChannelRegistry.ProviderNotFoundException ex) {
assertThat(ex).hasMessageThat().contains(errorString);
assertThat(ex).hasMessageThat().contains(ErrorProvider.class.getName());
}
}
@Test
public void newChannelBuilder_providerReturnsNonNull() {
ManagedChannelRegistry registry = new ManagedChannelRegistry();
registry.register(new BaseProvider(true, 5) {
@Override
public NewChannelBuilderResult newChannelBuilder(
String passedTarget, ChannelCredentials passedCreds) {
return NewChannelBuilderResult.error("dodging");
}
});
class MockChannelBuilder extends ForwardingChannelBuilder<MockChannelBuilder> {
@Override public ManagedChannelBuilder<?> delegate() {
throw new UnsupportedOperationException();
}
}
final ManagedChannelBuilder<?> mcb = new MockChannelBuilder();
registry.register(new BaseProvider(true, 4) {
@Override
public NewChannelBuilderResult newChannelBuilder(
String passedTarget, ChannelCredentials passedCreds) {
return NewChannelBuilderResult.channelBuilder(mcb);
}
});
registry.register(new BaseProvider(true, 3) {
@Override
public NewChannelBuilderResult newChannelBuilder(
String passedTarget, ChannelCredentials passedCreds) {
fail("Should not be called");
throw new AssertionError();
}
});
assertThat(registry.newChannelBuilder(target, creds)).isSameInstanceAs(mcb);
}
@Test
public void newChannelBuilder_noProvider() {
ManagedChannelRegistry registry = new ManagedChannelRegistry();
try {
registry.newChannelBuilder(target, creds);
fail("expected exception");
} catch (ManagedChannelRegistry.ProviderNotFoundException ex) {
assertThat(ex).hasMessageThat().contains("No functional channel service provider found");
assertThat(ex).hasMessageThat().contains("grpc-netty");
}
}
private static class BaseProvider extends ManagedChannelProvider {
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
protected ManagedChannelBuilder<?> builderForAddress(String name, int port) {
throw new UnsupportedOperationException();
}
@Override
protected ManagedChannelBuilder<?> builderForTarget(String target) {
throw new UnsupportedOperationException();
}
}
}