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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.internal.cache.wan;

import java.util.Iterator;
import java.util.ServiceLoader;

import org.apache.geode.annotations.Immutable;
import org.apache.geode.cache.client.internal.locator.wan.LocatorMembershipListener;
import org.apache.geode.cache.wan.GatewayReceiverFactory;
import org.apache.geode.cache.wan.GatewaySenderFactory;
import org.apache.geode.distributed.internal.WanLocatorDiscoverer;
import org.apache.geode.internal.cache.InternalCache;
import org.apache.geode.internal.cache.wan.spi.WANFactory;

public class WANServiceProvider {
  @Immutable
  private static final WANFactory factory;

  static {
    ServiceLoader loader = ServiceLoader.load(WANFactory.class);
    Iterator itr = loader.iterator();
    if (!itr.hasNext()) {
      factory = null;
    } else {
      factory = itr.next();
      factory.initialize();
    }
  }

  public static GatewaySenderFactory createGatewaySenderFactory(InternalCache cache) {
    if (factory == null) {
      throw new IllegalStateException("WAN service is not available.");
    }
    return factory.createGatewaySenderFactory(cache);

  }

  public static GatewayReceiverFactory createGatewayReceiverFactory(InternalCache cache) {
    if (factory == null) {
      throw new IllegalStateException("WAN service is not available.");
    }
    return factory.createGatewayReceiverFactory(cache);
  }

  public static WanLocatorDiscoverer createLocatorDiscoverer() {
    if (factory == null) {
      return null;
    }
    return factory.createLocatorDiscoverer();
  }

  public static LocatorMembershipListener createLocatorMembershipListener() {
    if (factory == null) {
      return null;
    }
    return factory.createLocatorMembershipListener();
  }

  private WANServiceProvider() {}
}