Yes, the change handler can be moved into a separate function for better organization and modularity. Here's an updated version of the code:

java

import com.microsoft.azure.cosmosdb.ChangeFeedOptions;
import com.microsoft.azure.cosmosdb.ChangeFeedProcessor;
import com.microsoft.azure.cosmosdb.ChangeFeedProcessorBuilder;
import com.microsoft.azure.cosmosdb.ConnectionPolicy;
import com.microsoft.azure.cosmosdb.Document;
import com.microsoft.azure.cosmosdb.DocumentClient;
import com.microsoft.azure.cosmosdb.DocumentClientException;
import com.microsoft.azure.cosmosdb.FeedOptions;
import com.microsoft.azure.cosmosdb.ResourceResponse;
import com.microsoft.azure.cosmosdb.SqlQuerySpec;

public class ChangeFeedProcessorExample {
    private static final String ENDPOINT = "https://<cosmosdb-account>.documents.azure.com:443/";
    private static final String MASTER_KEY = "<master-key>";
    private static final String DATABASE_ID = "<database-id>";
    private static final String CONTAINER_ID = "<container-id>";
    private static final String LEASE_CONTAINER_ID = "<lease-container-id>";

    public static void main(String[] args) {
        ConnectionPolicy connectionPolicy = new ConnectionPolicy();
        DocumentClient documentClient = new DocumentClient(ENDPOINT, MASTER_KEY, connectionPolicy, com.microsoft.azure.cosmosdb.ConsistencyLevel.Session);

        ChangeFeedOptions changeFeedOptions = new ChangeFeedOptions();
        changeFeedOptions.setPartitionKeyRangeId("0");
        changeFeedOptions.setStartFromBeginning(true);

        ChangeFeedProcessor changeFeedProcessor = new ChangeFeedProcessorBuilder()
                .hostName("sample")
                .feedContainer(DATABASE_ID, CONTAINER_ID)
                .leaseContainer(DATABASE_ID, LEASE_CONTAINER_ID)
                .options(changeFeedOptions)
                .processChangeFeed(ChangeFeedExample::handleChanges)
                .build();

        changeFeedProcessor.start();
    }

    private static void handleChanges(com.microsoft.azure.cosmosdb.ChangeFeedProcessor.ChangeFeedObserverContext context, Iterable<Document> docs) {
        for (Document doc : docs) {
            System.out.println("Processing document: " + doc.getId());
        }
    }
}

In this updated version, the change handler is moved into a separate function handleChanges. The change handler is now passed to the processChangeFeed method of the ChangeFeedProcessorBuilder as a reference to the handleChanges method, using the syntax ChangeFeedExample::handleChanges. This allows the change handler to be defined in a separate, reusable function, which can be called multiple times by the change feed processor.
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