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/*
* Copyright 2015 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.newresource.impl;
import com.google.common.annotations.Beta;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.Service;
import org.onosproject.event.AbstractListenerManager;
import org.onosproject.net.newresource.ResourceAdminService;
import org.onosproject.net.newresource.ResourceAllocation;
import org.onosproject.net.newresource.ResourceConsumer;
import org.onosproject.net.newresource.ResourceEvent;
import org.onosproject.net.newresource.ResourceListener;
import org.onosproject.net.newresource.ResourceService;
import org.onosproject.net.newresource.ResourcePath;
import org.onosproject.net.newresource.ResourceStore;
import org.onosproject.net.newresource.ResourceStoreDelegate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* An implementation of ResourceService.
*/
@Component(immediate = true)
@Service
@Beta
public final class ResourceManager extends AbstractListenerManager<ResourceEvent, ResourceListener>
implements ResourceService, ResourceAdminService {
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ResourceStore store;
private final ResourceStoreDelegate delegate = new InternalStoreDelegate();
@Activate
public void activate() {
store.setDelegate(delegate);
eventDispatcher.addSink(ResourceEvent.class, listenerRegistry);
}
@Deactivate
public void deactivate() {
store.unsetDelegate(delegate);
eventDispatcher.removeSink(ResourceEvent.class);
}
@Override
public List<ResourceAllocation> allocate(ResourceConsumer consumer,
List<ResourcePath> resources) {
checkNotNull(consumer);
checkNotNull(resources);
boolean success = store.allocate(resources, consumer);
if (!success) {
return ImmutableList.of();
}
return resources.stream()
.map(x -> new ResourceAllocation(x, consumer))
.collect(Collectors.toList());
}
@Override
public boolean release(List<ResourceAllocation> allocations) {
checkNotNull(allocations);
List<ResourcePath> resources = allocations.stream()
.map(ResourceAllocation::resource)
.collect(Collectors.toList());
List<ResourceConsumer> consumers = allocations.stream()
.map(ResourceAllocation::consumer)
.collect(Collectors.toList());
return store.release(resources, consumers);
}
@Override
public boolean release(ResourceConsumer consumer) {
checkNotNull(consumer);
Collection<ResourceAllocation> allocations = getResourceAllocations(consumer);
return release(ImmutableList.copyOf(allocations));
}
@Override
public Optional<ResourceAllocation> getResourceAllocation(ResourcePath resource) {
checkNotNull(resource);
Optional<ResourceConsumer> consumer = store.getConsumer(resource);
return consumer.map(x -> new ResourceAllocation(resource, x));
}
@Override
public <T> Collection<ResourceAllocation> getResourceAllocations(ResourcePath parent, Class<T> cls) {
checkNotNull(parent);
checkNotNull(cls);
Collection<ResourcePath> resources = store.getAllocatedResources(parent, cls);
List<ResourceAllocation> allocations = new ArrayList<>(resources.size());
for (ResourcePath resource: resources) {
// We access store twice in this method, then the store may be updated by others
Optional<ResourceConsumer> consumer = store.getConsumer(resource);
if (consumer.isPresent()) {
allocations.add(new ResourceAllocation(resource, consumer.get()));
}
}
return allocations;
}
@Override
public Collection<ResourceAllocation> getResourceAllocations(ResourceConsumer consumer) {
checkNotNull(consumer);
Collection<ResourcePath> resources = store.getResources(consumer);
return resources.stream()
.map(x -> new ResourceAllocation(x, consumer))
.collect(Collectors.toList());
}
@Override
public Collection<ResourcePath> getAvailableResources(ResourcePath parent) {
checkNotNull(parent);
Collection<ResourcePath> children = store.getChildResources(parent);
return children.stream()
// We access store twice in this method, then the store may be updated by others
.filter(x -> !store.getConsumer(x).isPresent())
.collect(Collectors.toList());
}
@Override
public boolean isAvailable(ResourcePath resource) {
checkNotNull(resource);
Optional<ResourceConsumer> consumer = store.getConsumer(resource);
return !consumer.isPresent();
}
@Override
public <T> boolean registerResources(ResourcePath parent, List<T> children) {
checkNotNull(parent);
checkNotNull(children);
checkArgument(!children.isEmpty());
List<ResourcePath> resources = Lists.transform(children, parent::child);
return store.register(resources);
}
@Override
public <T> boolean unregisterResources(ResourcePath parent, List<T> children) {
checkNotNull(parent);
checkNotNull(children);
checkArgument(!children.isEmpty());
List<ResourcePath> resources = Lists.transform(children, parent::child);
return store.unregister(resources);
}
private class InternalStoreDelegate implements ResourceStoreDelegate {
@Override
public void notify(ResourceEvent event) {
post(event);
}
}
}
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