io.grpc.xds.internal.security.certprovider.CertificateProviderRegistry Maven / Gradle / Ivy
/*
* 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.xds.internal.security.certprovider;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.VisibleForTesting;
import java.util.LinkedHashMap;
import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;
/** Maintains {@link CertificateProvider}s for all registered plugins. */
@ThreadSafe
public final class CertificateProviderRegistry {
private static CertificateProviderRegistry instance;
private final LinkedHashMap providers =
new LinkedHashMap<>();
@VisibleForTesting
public CertificateProviderRegistry() {
}
/** Returns the singleton registry. */
public static synchronized CertificateProviderRegistry getInstance() {
if (instance == null) {
instance = new CertificateProviderRegistry();
// TODO(sanjaypujare): replace with Java's SPI mechanism and META-INF resource
instance.register(new FileWatcherCertificateProviderProvider());
}
return instance;
}
/**
* Register a {@link CertificateProviderProvider}.
*
* If a provider with the same {@link CertificateProviderProvider#getName name} was already
* registered, this method will overwrite that provider.
*/
public synchronized void register(CertificateProviderProvider certificateProviderProvider) {
checkNotNull(certificateProviderProvider, "certificateProviderProvider");
providers.put(certificateProviderProvider.getName(), certificateProviderProvider);
}
/**
* Deregisters a provider. No-op if the provider is not in the registry.
*
* @param certificateProviderProvider the provider that was added to the registry via
* {@link #register}.
*/
public synchronized void deregister(CertificateProviderProvider certificateProviderProvider) {
checkNotNull(certificateProviderProvider, "certificateProviderProvider");
providers.remove(certificateProviderProvider.getName());
}
/**
* Returns the CertificateProviderProvider for the given name, or {@code null} if no
* provider is found. Each provider declares its name via {@link
* CertificateProviderProvider#getName}. This is an internal method of the Registry
* *only* used by the framework.
*/
@Nullable
synchronized CertificateProviderProvider getProvider(String name) {
return providers.get(checkNotNull(name, "name"));
}
}