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Building blocks for client libraries that access
ClusterMate-based service.
package com.fasterxml.clustermate.client.cluster;
import java.util.*;
import java.util.concurrent.atomic.AtomicReference;
import com.fasterxml.clustermate.api.*;
import com.fasterxml.clustermate.client.*;
import com.fasterxml.clustermate.client.cluster.ClusterServerNodeImpl;
import com.fasterxml.storemate.shared.IpAndPort;
/**
* Class that encapsulates view of the cluster, as whole, from
* client perspective.
*/
public class ClusterViewByClientImpl
extends ClusterViewByClient
{
/**
* Reference to the underlying network client, so that we can
* construct paths for requests.
*/
private final NetworkClient _client;
private final KeySpace _keyspace;
private final EntryKeyConverter _keyConverter;
private final Map _nodes = new LinkedHashMap();
/**
* Since we will need to iterate over server nodes, let's use pre-calculated
* array.
*/
private AtomicReference _states = new AtomicReference(
new ClusterServerNode[0]);
private final EntryAccessors _entryAccessors;
/**
* Helper object that knows how to find node(s) to send requests to, for
* given key.
*/
private final HashRouter _hashRouter;
/*
/**********************************************************************
/* Construction
/**********************************************************************
*/
/**
* Path segments for the root path
*/
private final String[] _rootPathSegments;
public ClusterViewByClientImpl(StoreClientConfig storeConfig,
NetworkClient client, KeySpace keyspace)
{
_keyspace = keyspace;
if (client == null) {
_client = null;
_keyConverter = null;
_entryAccessors = null;
} else {
_client = client;
_keyConverter = client.getKeyConverter();
_entryAccessors = client.getEntryAccessors();
}
if (storeConfig == null) {
_rootPathSegments = new String[0];
} else {
_rootPathSegments = storeConfig.getBasePath();
}
_hashRouter = new HashRouter(keyspace, _keyConverter, _states);
}
public static ClusterViewByClientImpl forTesting(KeySpace keyspace)
{
return new ClusterViewByClientImpl(null, null, keyspace);
}
/*
protected String[] _splitPath(String base)
{
base = base.trim();
if (base.startsWith("/")) {
base = base.substring(1);
}
if (base.endsWith("/")) {
base = base.substring(0, base.length()-1);
}
if (base.length() == 0) {
return new String[0];
}
return base.split("/");
}
*/
/*
/**********************************************************************
/* Accessors
/**********************************************************************
*/
@Override
public int getServerCount() {
return _nodes.size();
}
@Override
public boolean isFullyAvailable() {
return getCoverage() == _keyspace.getLength();
}
@Override
public int getCoverage() {
return _getCoverage(_states.get());
}
// separate method for testing:
protected int _getCoverage(ClusterServerNode[] states)
{
BitSet slices = new BitSet(_keyspace.getLength());
for (ClusterServerNode state : states) {
state.getTotalRange().fill(slices);
}
return slices.cardinality();
}
@Override
public NodesForKey getNodesFor(K key) {
return _hashRouter.getNodesFor(key);
}
/*
/**********************************************************************
/* Updating state
/**********************************************************************
*/
/**
* Method called to add information directly related to node that served
* the request.
*/
public synchronized void updateDirectState(IpAndPort byNode, NodeState stateInfo,
long requestTime, long responseTime,
long clusterInfoVersion)
{
ClusterServerNodeImpl localState = _nodes.get(byNode);
if (localState == null) { // new info
localState = new ClusterServerNodeImpl(_rootPathFor(byNode),
byNode, stateInfo.getRangeActive(), stateInfo.getRangePassive(),
_entryAccessors);
_addNode(byNode, localState);
}
boolean needInvalidate = localState.updateRanges(stateInfo.getRangeActive(),
stateInfo.getRangePassive());
if (localState.updateDisabled(stateInfo.isDisabled())) {
needInvalidate = true;
}
if (needInvalidate) {
invalidateRouting();
}
localState.setLastRequestSent(requestTime);
localState.setLastResponseReceived(responseTime);
localState.setLastNodeUpdateFetched(stateInfo.getLastUpdated());
localState.setLastClusterUpdateFetched(clusterInfoVersion);
}
/**
* Method called to add information obtained indirectly; i.e. "gossip".
*/
public synchronized void updateIndirectState(IpAndPort byNode, NodeState stateInfo)
{
// First: ensure references are properly resolved (eliminate "localhost" if need be):
IpAndPort ip = stateInfo.getAddress();
if (ip.isLocalReference()) {
ip = byNode.withPort(ip.getPort());
}
final long nodeInfoTimestamp = stateInfo.getLastUpdated();
// otherwise pretty simple:
ClusterServerNodeImpl state = _nodes.get(ip);
if (state == null) { // new info
state = new ClusterServerNodeImpl(_rootPathFor(ip),
ip, stateInfo.getRangeActive(), stateInfo.getRangePassive(),
_entryAccessors);
_addNode(ip, state);
} else {
// quick check to ensure info we get is newer: if not, skip
if (nodeInfoTimestamp <= state.getLastNodeUpdateFetched()) {
return;
}
}
state.setLastNodeUpdateFetched(nodeInfoTimestamp);
boolean needInvalidate = state.updateRanges(stateInfo.getRangeActive(),
stateInfo.getRangePassive());
if (state.updateDisabled(stateInfo.isDisabled())) {
needInvalidate = true;
}
if (needInvalidate) {
invalidateRouting();
}
}
/*
/**********************************************************************
/* Test support
/**********************************************************************
*/
protected NodesForKey _calculateNodes(int version, KeyHash keyHash,
ClusterServerNode[] allNodes)
{
return _hashRouter._calculateNodes(version, keyHash, allNodes);
}
/*
/**********************************************************************
/* Internal methods
/**********************************************************************
*/
protected RequestPath _rootPathFor(IpAndPort serverAddress)
{
RequestPathBuilder builder = _client.pathBuilder(serverAddress);
for (String component : _rootPathSegments) {
builder = builder.addPathSegment(component);
}
return builder.build();
}
private void _addNode(IpAndPort key, ClusterServerNodeImpl state)
{
_nodes.put(key, state);
_states.set(_nodes.values().toArray(new ClusterServerNodeImpl[_nodes.size()]));
}
/**
* Method called when server node state information changes in a way that
* may affect routing of requests.
*/
private final void invalidateRouting() {
_hashRouter.invalidateRouting();
}
}