はい、変更ハンドラーは別の関数に移すことができます。これがコードの更新版だ：

```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());
        }
    }
}
```

この更新バージョンでは、変更ハンドラは別の関数 handleChanges に移動しました。変更ハンドラは、ChangeFeedExample::handleChanges という構文を使用して handleChanges メソッドへの参照として ChangeFeedProcessorBuilder の processChangeFeed メソッドに渡されるようになりました。これにより、変更ハンドラを再利用可能な別の関数として定義できるようになり、 それを変更フィードプロセッサから複数回コールできるようになりました。
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.