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/*
* Copyright 2014 Open Networking Laboratory
*
* 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 org.onosproject.net.provider;
import com.google.common.collect.ImmutableSet;
import org.onosproject.net.DeviceId;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
/**
* Base implementation of provider registry.
*
* @param <P> type of the information provider
* @param <S> type of the provider service
*/
public abstract class AbstractProviderRegistry<P extends Provider, S extends ProviderService<P>>
implements ProviderRegistry<P, S> {
private final Map<ProviderId, P> providers = new HashMap<>();
private final Map<ProviderId, S> services = new HashMap<>();
private final Map<String, P> providersByScheme = new HashMap<>();
/**
* Creates a new provider service bound to the specified provider.
*
* @param provider provider
* @return provider service
*/
protected abstract S createProviderService(P provider);
@Override
public synchronized S register(P provider) {
checkNotNull(provider, "Provider cannot be null");
checkState(!services.containsKey(provider.id()), "Provider %s already registered", provider.id());
// If the provider is a primary one, check for a conflict.
ProviderId pid = provider.id();
checkState(pid.isAncillary() || !providersByScheme.containsKey(pid.scheme()),
"A primary provider with id %s is already registered",
providersByScheme.get(pid.scheme()));
S service = createProviderService(provider);
services.put(provider.id(), service);
providers.put(provider.id(), provider);
// Register the provider by URI scheme only if it is not ancillary.
if (!pid.isAncillary()) {
providersByScheme.put(pid.scheme(), provider);
}
return service;
}
@Override
public synchronized void unregister(P provider) {
checkNotNull(provider, "Provider cannot be null");
S service = services.get(provider.id());
if (service != null && service instanceof AbstractProviderService) {
((AbstractProviderService) service).invalidate();
services.remove(provider.id());
providers.remove(provider.id());
if (!provider.id().isAncillary()) {
providersByScheme.remove(provider.id().scheme());
}
}
}
@Override
public synchronized Set<ProviderId> getProviders() {
return ImmutableSet.copyOf(services.keySet());
}
/**
* Returns the provider registered with the specified provider ID.
*
* @param providerId provider identifier
* @return provider
*/
protected synchronized P getProvider(ProviderId providerId) {
return providers.get(providerId);
}
/**
* Returns the provider for the specified device ID based on URI scheme.
*
* @param deviceId device identifier
* @return provider bound to the URI scheme
*/
protected synchronized P getProvider(DeviceId deviceId) {
return providersByScheme.get(deviceId.uri().getScheme());
}
}
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