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/*
 * Copyright (c) 2017 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.clustering.it.provider;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.opendaylight.mdsal.binding.api.RpcProviderService;
import org.opendaylight.mdsal.singleton.api.ClusterSingletonService;
import org.opendaylight.mdsal.singleton.api.ClusterSingletonServiceProvider;
import org.opendaylight.mdsal.singleton.api.ServiceGroupIdentifier;
import org.opendaylight.yang.gen.v1.urn.opendaylight.controller.basic.rpc.test.rev160120.BasicGlobal;
import org.opendaylight.yang.gen.v1.urn.opendaylight.controller.basic.rpc.test.rev160120.BasicGlobalOutputBuilder;
import org.opendaylight.yangtools.concepts.Registration;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
@Component(service = { })
public final class BasicRpcTestProvider implements ClusterSingletonService {
    private static final Logger LOG = LoggerFactory.getLogger(BasicRpcTestProvider.class);
    private static final ServiceGroupIdentifier IDENTIFIER = new ServiceGroupIdentifier("Basic-rpc-test");

    private final RpcProviderService rpcProviderRegistry;
    private final Registration singletonRegistration;

    private Registration rpcRegistration = null;

    @Inject
    @Activate
    public BasicRpcTestProvider(@Reference final RpcProviderService rpcProviderRegistry,
                                @Reference final ClusterSingletonServiceProvider singletonService) {
        this.rpcProviderRegistry = rpcProviderRegistry;
        singletonRegistration = singletonService.registerClusterSingletonService(this);
    }

    @PreDestroy
    @Deactivate
    public void close() {
        singletonRegistration.close();
    }

    @Override
    public void instantiateServiceInstance() {
        LOG.info("Basic testing rpc registered as global");
        rpcRegistration = rpcProviderRegistry.registerRpcImplementation((BasicGlobal) input -> {
            LOG.info("Basic test global rpc invoked");
            return RpcResultBuilder.success(new BasicGlobalOutputBuilder().build()).buildFuture();
        });
    }

    @Override
    public ListenableFuture closeServiceInstance() {
        rpcRegistration.close();
        rpcRegistration = null;

        return Futures.immediateFuture(null);
    }

    @Override
    public ServiceGroupIdentifier getIdentifier() {
        return IDENTIFIER;
    }
}