com.fasterxml.clustermate.client.NodesForKey Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of clustermate-client Show documentation

Building blocks for client libraries that access ClusterMate-based service.

There is a newer version: 0.10.5

package com.fasterxml.clustermate.client;

import java.util.*;

/**
 * Container class for an ordered set of references to server nodes
 * that should be contacted for accessing content for given
 * key, based on key hash based matching.
 */
public class NodesForKey implements Iterable
{
    private final static ClusterServerNode[] NO_NODES = new ClusterServerNode[0];
    
    private final int _version;

    private final ClusterServerNode[] _nodes;
    
    /*
    /**********************************************************************
    /* Construction
    /**********************************************************************
     */
    
    public NodesForKey(int version, ClusterServerNode[] nodes)
    {
        _version = version;
        _nodes = nodes;
    }

    public static NodesForKey empty(int version) {
        return new NodesForKey(version, NO_NODES);
    }
    
    /*
    /**********************************************************************
    /* Accessors
    /**********************************************************************
     */
    
    public int version() { return _version; }

    public boolean isEmpty() { return _nodes.length == 0; }
    public int size() { return _nodes.length; }

    public ClusterServerNode node(int index) {
        return _nodes[index];
    }

    @Override
    public Iterator iterator() {
        if (_nodes.length == 0) {
            return Collections.emptyList().iterator();
        }
        return Arrays.asList(_nodes).iterator();
    }
    
    public List asList() {
        final int len = _nodes.length;
        if (len == 0) {
            return Collections.emptyList();
        }
        List list = new ArrayList(len);
        for (int i = 0; i < len; ++i) {
            list.add(_nodes[i]);
        }
        return list;
    }

    /*
    /**********************************************************************
    /* Overrides
    /**********************************************************************
     */

    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder();
        sb.append("[Nodes (").append(_nodes.length).append(") ");
        for (int i = 0, end = _nodes.length; i < end; ++i) {
            if (i > 0) {
                sb.append(", ");
            }
            ClusterServerNode node = _nodes[i];
            sb.append(node.getAddress()).append(": ranges=");
            sb.append(node.getActiveRange()).append('/').append(node.getPassiveRange());
        }
        sb.append(")");
        return sb.toString();
    }
}