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The official Couchbase JVM Core IO Library
/**
* Copyright (C) 2014 Couchbase, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
* IN THE SOFTWARE.
*/
package com.couchbase.client.core.node.locate;
import com.couchbase.client.core.config.BucketConfig;
import com.couchbase.client.core.config.ClusterConfig;
import com.couchbase.client.core.config.CouchbaseBucketConfig;
import com.couchbase.client.core.config.NodeInfo;
import com.couchbase.client.core.config.Partition;
import com.couchbase.client.core.logging.CouchbaseLogger;
import com.couchbase.client.core.logging.CouchbaseLoggerFactory;
import com.couchbase.client.core.message.CouchbaseRequest;
import com.couchbase.client.core.message.dcp.DCPRequest;
import com.couchbase.client.core.message.dcp.OpenConnectionRequest;
import com.couchbase.client.core.node.Node;
import com.couchbase.client.core.service.ServiceType;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* This {@link Locator} finds the proper {@link Node}s for every incoming {@link DCPRequest}.
*
* In general it relies upon partition number to select nodes, but some commands like
* {@link OpenConnectionRequest} have to be broad casted.
*
* @author Sergey Avseyev
* @since 1.1.0
*/
public class DCPLocator implements Locator {
private static final CouchbaseLogger LOGGER = CouchbaseLoggerFactory.getInstance(DCPLocator.class);
@Override
public Node[] locate(final CouchbaseRequest request, final Set nodes, final ClusterConfig cluster) {
BucketConfig bucket = cluster.bucketConfig(request.bucket());
if (!(bucket instanceof CouchbaseBucketConfig && request instanceof DCPRequest)) {
throw new IllegalStateException("Unsupported Bucket Type: for request " + request);
}
CouchbaseBucketConfig config = (CouchbaseBucketConfig) bucket;
DCPRequest dcpRequest = (DCPRequest) request;
if (dcpRequest instanceof OpenConnectionRequest) {
List located = new ArrayList();
for (NodeInfo nodeInfo : config.nodes()) {
if (nodeInfo.services().containsKey(ServiceType.DCP)) {
for (Node node : nodes) {
if (node.hostname().equals(nodeInfo.hostname())) {
located.add(node);
break;
}
}
}
}
if (!located.isEmpty()) {
return located.toArray(new Node[located.size()]);
}
} else {
int nodeId = config.nodeIndexForMaster(dcpRequest.partition());
if (nodeId == -2) {
return null;
}
if (nodeId == -1) {
return new Node[]{};
}
NodeInfo nodeInfo = config.nodeAtIndex(nodeId);
if (config.nodes().size() != nodes.size()) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Node list and configuration's partition hosts sizes : {} <> {}, rescheduling",
nodes.size(), config.nodes().size());
}
return new Node[]{};
}
for (Node node : nodes) {
if (node.hostname().equals(nodeInfo.hostname())) {
return new Node[]{node};
}
}
}
throw new IllegalStateException("Node not found for request: " + request);
}
}