/*
* 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.sling.replication.transport.impl;
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.replication.communication.ReplicationRequest;
import org.apache.sling.replication.packaging.ReplicationPackage;
import org.apache.sling.replication.transport.ReplicationTransportException;
import org.apache.sling.replication.transport.ReplicationTransportHandler;
/**
* {@link org.apache.sling.replication.transport.ReplicationTransportHandler} supporting delivery / retrieval from multiple
* endpoints.
*/
public class MultipleEndpointReplicationTransportHandler implements ReplicationTransportHandler {
private final List<ReplicationTransportHandler> transportHelpers;
private final TransportEndpointStrategyType endpointStrategyType;
private int lastSuccessfulEnpointId = 0;
public MultipleEndpointReplicationTransportHandler(List<ReplicationTransportHandler> transportHelpers,
TransportEndpointStrategyType endpointStrategyType) {
this.transportHelpers = transportHelpers;
this.endpointStrategyType = endpointStrategyType;
}
private List<ReplicationPackage> doTransport(ResourceResolver resourceResolver, ReplicationRequest replicationRequest, ReplicationPackage replicationPackage) throws ReplicationTransportException {
int offset = 0;
if (endpointStrategyType.equals(TransportEndpointStrategyType.One)) {
offset = lastSuccessfulEnpointId;
}
int length = transportHelpers.size();
List<ReplicationPackage> result = new ArrayList<ReplicationPackage>();
for (int i = 0; i < length; i++) {
int currentId = (offset + i) % length;
ReplicationTransportHandler transportHelper = transportHelpers.get(currentId);
if (replicationPackage != null) {
transportHelper.deliverPackage(resourceResolver, replicationPackage);
} else if (replicationRequest != null) {
result.addAll(transportHelper.retrievePackages(resourceResolver, replicationRequest));
}
lastSuccessfulEnpointId = currentId;
if (endpointStrategyType.equals(TransportEndpointStrategyType.One))
break;
}
return result;
}
public void deliverPackage(@Nonnull ResourceResolver resourceResolver, @Nonnull ReplicationPackage replicationPackage) throws ReplicationTransportException {
doTransport(resourceResolver, null, replicationPackage);
}
@Nonnull
public List<ReplicationPackage> retrievePackages(@Nonnull ResourceResolver resourceResolver, @Nonnull ReplicationRequest replicationRequest) throws ReplicationTransportException {
return doTransport(resourceResolver, replicationRequest, null);
}
}