com.couchbase.client.core.node.StandardMemcachedHashingStrategy Maven / Gradle / Ivy

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The official Couchbase JVM Core IO Library

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/*
 * Copyright (c) 2017 Couchbase, Inc.
 *
 * Licensed 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 com.couchbase.client.core.node;

import com.couchbase.client.core.config.NodeInfo;
import com.couchbase.client.core.service.ServiceType;

/**
 * A {@link MemcachedHashingStrategy} which is compatible with libcouchbase and SDKs that
 * are built on top.
 *
 * @author Michael Nitschinger
 * @since 1.5.3
 */
public class StandardMemcachedHashingStrategy implements MemcachedHashingStrategy {

    public static final StandardMemcachedHashingStrategy INSTANCE = new StandardMemcachedHashingStrategy();

    private StandardMemcachedHashingStrategy() { }

    @Override
    public String hash(final NodeInfo info, final int repetition) {
        int port = info.services().get(ServiceType.KV);

        // Compatibility note: libcouchbase encloses the host in square brackets
        // if it is an IPv6 literal (contains colons). The Java SDK doesn't do that.

        return info.hostname() + ":" + port + "-" + repetition;
    }

}