[英]Hazelcast IMap get as binary
有什么方法可以从Hazelcast映射中以字节为单位检索条目? 我们有一个中间(Hz)消息队列,在这里我们将通过本地条目侦听器提供映射条目(值)。
为了降低(反序列化)成本,我们将byte []传递给Hz队列。 但是,为此,我们必须在添加到队列之前再次手动反序列化入口对象。 传递的对象是同一对象,我正在考虑某种方法来减少这种“冗余”反序列化。
您可以使用内部API来实现,但是将来可能随时更改。 我可以举一个例子,但是我不确定这是您要使用的东西。
编辑:如前所述,它使用了很多内部API,因此请注意它可能随时更改(甚至不提)的事实:
public class Test {
public static void main(String[] args) throws Exception {
HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
IMap<String, String> map = hazelcastInstance.getMap("myMapName");
String key = "mySearchedKey";
map.put(key, "foo");
SerializationService serializationService = getSerializationService(map);
Data keyData = serializationService.toData(key);
RecordStore recordStore = getRecordStore(map, key);
Record record = recordStore.getRecord(keyData);
// This will do no serialization in most cases since Data is a DataRecord
// only for InMemoryFormat::OBJECT this will serialize the object to a Data
// instance
Data serializedValue = serializationService.toData(record.getValue());
}
/**
* This method handles internal APIs!!!
*/
private static SerializationService getSerializationService(IMap<String, String> map) {
MapProxyImpl<String, String> proxy = (MapProxyImpl<String, String>) map;
return proxy.getNodeEngine().getSerializationService();
}
/**
* This method handles internal APIs!!!
*/
private static RecordStore getRecordStore(IMap<String, String> map, String key) throws Exception {
MapProxyImpl<String, String> proxy = (MapProxyImpl<String, String>) map;
HazelcastInstance hazelcastInstance = proxy.getNodeEngine().getHazelcastInstance();
MapService mapService = proxy.getService();
MapServiceContext mapServiceContext = mapService.getMapServiceContext();
PartitionService partitionService = hazelcastInstance.getPartitionService();
Partition partition = partitionService.getPartition(key);
PartitionContainer partitionContainer = mapServiceContext.getPartitionContainer(partition.getPartitionId());
return partitionContainer.getRecordStore("myMapName");
}
}
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