| package org.onlab.onos.net.provider; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| /** |
| * Base implementation of a provider service, which tracks the provider to |
| * which it is issued and can be invalidated. |
| * |
| * @param <P> type of the information provider |
| */ |
| public abstract class AbstractProviderService<P extends Provider> implements ProviderService<P> { |
| |
| private boolean isValid = true; |
| private final P provider; |
| |
| /** |
| * Creates a provider service on behalf of the specified provider. |
| * |
| * @param provider provider to which this service is being issued |
| */ |
| protected AbstractProviderService(P provider) { |
| this.provider = provider; |
| } |
| |
| /** |
| * Invalidates this provider service. |
| */ |
| public void invalidate() { |
| isValid = false; |
| } |
| |
| /** |
| * Checks the validity of this provider service. |
| * |
| * @throws java.lang.IllegalStateException if the service is no longer valid |
| */ |
| public void checkValidity() { |
| checkState(isValid, "Provider service is no longer valid"); |
| } |
| |
| @Override |
| public P provider() { |
| return provider; |
| } |
| |
| } |