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LOCAL_PING, new discovery protocol for members in the same process (h…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package org.jgroups.protocols; | ||
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| import org.jgroups.Address; | ||
| import org.jgroups.Event; | ||
| import org.jgroups.PhysicalAddress; | ||
| import org.jgroups.util.NameCache; | ||
| import org.jgroups.util.Responses; | ||
| import org.jgroups.util.Tuple; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.function.Function; | ||
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| /** | ||
| * Discovery protocol for finding members in the local process only. Doesn't send discovery requests and responses, but | ||
| * fetches discovery information directly from a hashmap. Used mainly by unit test. | ||
| * @author Bela Ban | ||
| * @since 4.1.3 | ||
| */ | ||
| public class LOCAL_PING extends Discovery { | ||
| /** Map of cluster names and address-protocol mappings. Used for routing messages to all or single members */ | ||
| protected static final Map<String,List<PingData>> discovery=new ConcurrentHashMap<>(); | ||
| protected static final Function<String,List<PingData>> func=k -> new ArrayList<>(); | ||
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| public boolean isDynamic() { | ||
| return true; | ||
| } | ||
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| public void stop() { | ||
| super.stop(); | ||
| } | ||
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| @Override | ||
| public void findMembers(List<Address> members, boolean initial_discovery, Responses responses) { | ||
| num_discovery_requests++; | ||
| List<PingData> list=discovery.get(cluster_name); | ||
| if(list != null && !list.isEmpty()) { | ||
| synchronized(this) { | ||
| if(list.stream().noneMatch(PingData::isCoord)) | ||
| list.get(0).coord(true); | ||
| list.stream().filter(el -> !el.sender.equals(local_addr)) | ||
| .forEach(d -> { | ||
| addAddressToLocalCache(d.sender, d.physical_addr); | ||
| responses.addResponse(d, false); | ||
| }); | ||
| } | ||
| } | ||
| responses.done(); // so waitFor() doesn't block at all | ||
| } | ||
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| public Object down(Event evt) { | ||
| if(evt.type() == Event.VIEW_CHANGE && cluster_name != null) { | ||
| // synchronize TP.logical_addr_cache with discovery cache | ||
| List<PingData> data=discovery.get(cluster_name); | ||
| if(data != null && !data.isEmpty()) { | ||
| for(PingData d: data) { | ||
| Address sender=d.getAddress(); | ||
| if(down_prot.down(new Event(Event.GET_PHYSICAL_ADDRESS, sender)) == null) | ||
| down_prot.down(new Event(Event.ADD_PHYSICAL_ADDRESS, new Tuple<>(sender, d.getPhysicalAddr()))); | ||
| } | ||
| } | ||
| } | ||
| return super.down(evt); | ||
| } | ||
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| public void handleConnect() { | ||
| if(cluster_name == null || local_addr == null) | ||
| throw new IllegalStateException("cluster name and local address cannot be null"); | ||
| String logical_name=NameCache.get(local_addr); | ||
| PhysicalAddress physical_addr=(PhysicalAddress)down_prot.down(new Event(Event.GET_PHYSICAL_ADDRESS, local_addr)); | ||
| if(physical_addr != null) { | ||
| PingData data=new PingData(local_addr, is_server, logical_name, physical_addr); | ||
| final List<PingData> list=discovery.computeIfAbsent(cluster_name, func); | ||
| synchronized(this) { | ||
| if(list.isEmpty()) | ||
| data.coord(true); // first element is coordinator | ||
| list.add(data); | ||
| } | ||
| } | ||
| } | ||
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| public void handleDisconnect() { | ||
| if(local_addr == null || cluster_name == null) | ||
| return; | ||
| List<PingData> list=discovery.get(cluster_name); | ||
| if(list != null) { | ||
| synchronized(this) { | ||
| list.removeIf(p -> local_addr.equals(p.getAddress())); | ||
| if(list.isEmpty()) | ||
| discovery.remove(cluster_name); | ||
| } | ||
| } | ||
| } | ||
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| public String toString() { | ||
| return String.format("%s(%s)", LOCAL_PING.class.getSimpleName(), local_addr); | ||
| } | ||
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| protected void addAddressToLocalCache(Address addr, PhysicalAddress phys_addr) { | ||
| Tuple<Address,PhysicalAddress> tuple=new Tuple(addr, phys_addr); | ||
| down_prot.down(new Event(Event.ADD_PHYSICAL_ADDRESS, tuple)); | ||
| } | ||
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| } |
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