Revision 6411
Added by Chris Jones over 13 years ago
| src/edu/ucsb/nceas/metacat/dataone/CNodeService.java | ||
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import org.dataone.service.types.v1.SystemMetadata; |
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import com.hazelcast.client.HazelcastClient; |
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import com.hazelcast.core.EntryEvent; |
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import com.hazelcast.core.EntryListener; |
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import com.hazelcast.core.Hazelcast; |
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import com.hazelcast.core.IMap; |
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import com.hazelcast.core.IQueue; |
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* |
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*/ |
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public class CNodeService extends D1NodeService implements CNAuthorization, |
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CNCore, CNRead, CNReplication {
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CNCore, CNRead, CNReplication, EntryListener<Identifier, SystemMetadata> {
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/* the instance of the CNodeService object */ |
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private static CNodeService instance = null; |
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// Get a reference to the shared system metadata map as a cluster member |
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systemMetadata = Hazelcast.getMap(systemMetadataMap); |
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// Listen for changes to the system metadata map |
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systemMetadata.addEntryListener(this, true); |
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} catch (PropertyNotFoundException e) {
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String msg = "Couldn't find Hazelcast properties for the DataONE clusters. " + |
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} |
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/** |
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* Implement the EntryListener interface for Hazelcast, reponding to entry |
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* added events in the hzSystemMetadata map. Evaluate the entry and create |
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* CNReplicationTasks as appropriate (for DATA, METADATA, RESOURCE) |
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* |
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* @param event - The EntryEvent that occurred |
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*/ |
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@Override |
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public void entryAdded(EntryEvent<Identifier, SystemMetadata> event) {
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// TODO evaluate the type of system metadata change, decide if it warrants |
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// a replication event, what type (DATA, METADATA, RESOURCE), |
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// iteratively lock the PID, create and submit the tasks, and expect a result back. |
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// Deal with exceptions. |
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} |
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/** |
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* Implement the EntryListener interface for Hazelcast, reponding to entry |
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* evicted events in the hzSystemMetadata map. Evaluate the entry and create |
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* CNReplicationTasks as appropriate (for DATA, METADATA, RESOURCE) |
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* |
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* @param event - The EntryEvent that occurred |
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*/ |
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@Override |
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public void entryEvicted(EntryEvent<Identifier, SystemMetadata> event) {
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// nothing to do, entries are still in the backing store |
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} |
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/** |
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* Implement the EntryListener interface for Hazelcast, reponding to entry |
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* removed events in the hzSystemMetadata map. Evaluate the entry and create |
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* CNReplicationTasks as appropriate (for DATA, METADATA, RESOURCE) |
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* |
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* @param event - The EntryEvent that occurred |
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*/ |
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@Override |
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public void entryRemoved(EntryEvent<Identifier, SystemMetadata> event) {
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// we don't remove objects |
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} |
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/** |
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* Implement the EntryListener interface for Hazelcast, reponding to entry |
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* updated events in the hzSystemMetadata map. Evaluate the entry and create |
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* CNReplicationTasks as appropriate (for DATA, METADATA, RESOURCE) |
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* |
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* @param event - The EntryEvent that occurred |
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*/ |
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@Override |
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public void entryUpdated(EntryEvent<Identifier, SystemMetadata> event) {
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// TODO evaluate the type of system metadata change, decide if it warrants |
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// a replication event, what type (DATA, METADATA, RESOURCE), |
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// iteratively lock the PID, create and submit the tasks, and expect a result back. |
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// Deal with exceptions. |
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} |
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} |
Also available in: Unified diff
Add stub methods in CNodeService that implement the Hazelcast EntryListener interface: entryAdded(), entryRemoved(), entryUpdated(), and entryEvicted(). Add a listener to the hzSystemMetadata map so the CNodeService can respond to those events and create appropriate CNReplicationTask objects for distributed execution across the CN cluster. Again, stubs only so far.