assistant: 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.ConsistencyLevel;
import com.microsoft.azure.cosmosdb.DocumentClient;
import com.microsoft.azure.cosmosdb.DocumentClientException;
import com.microsoft.azure.cosmosdb.DocumentCollection;
import com.microsoft.azure.cosmosdb.FeedOptions;
import com.microsoft.azure.cosmosdb.FeedResponse;
import com.microsoft.azure.cosmosdb.ResourceResponse;
import com.microsoft.azure.cosmosdb.internal.directconnectivity.WFConstants;

import java.util.List;
import java.util.UUID;
import java.util.concurrent.CancellationToken;

public class CosmosDbChangeFeedProcessor {
private static final String DATABASE_ID = "databaseId";
private static final String COLLECTION_ID = "collectionId";
private static final String END_POINT_URI = "https://<your_cosmosdb_account_name>.documents.azure.com:443/";
private static final String PRIMARY_KEY = "<your_primary_key>";

private static void handleChanges(List<Document> docs, CancellationToken cancellationToken) {
// Process the changes
for (Document doc : docs) {
System.out.println("Change: " + doc.toJson());
}
}

public static void main(String[] args) {
// Create a DocumentClient instance
DocumentClient documentClient = new DocumentClient(END_POINT_URI, PRIMARY_KEY,
ConnectionPolicy.GetDefault(), ConsistencyLevel.Session);
try {
  // Get the reference to the database and collection
  DocumentCollection collection = documentClient
      .readCollection(String.format("/dbs/%s/colls/%s", DATABASE_ID, COLLECTION_ID), null)
      .getResource();

  // Define the ChangeFeedOptions
  ChangeFeedOptions changeFeedOptions = new ChangeFeedOptions();
  changeFeedOptions.setPartitionKeyRangeId(WFConstants.NoPartition);
  changeFeedOptions.setStartFromBeginning(true);

  // Define the ChangeFeedProcessor options
  ChangeFeedProcessorOptions changeFeedProcessorOptions = new ChangeFeedProcessorOptions();
  changeFeedProcessorOptions.setLeasePrefix("myChangeFeed");

  // Define the ChangeFeedProcessor
  ChangeFeedProcessor changeFeedProcessor = new ChangeFeedProcessorBuilder()
      .withDocumentClient(documentClient)
      .withFeedCollection(collection)
      .withProcessorOptions(changeFeedProcessorOptions)
      .withHandleChanges(CosmosDbChangeFeedProcessor::handleChanges)
      .build();

  // Start the ChangeFeedProcessor
  changeFeedProcessor.start();
} catch (DocumentClientException e) {
System.err.println("An error occurred while processing the Change Feed: " + e);
    }
  }
}

assistant: Here's some sample code in Java to process the Change Feed of a Cosmos DB NoSQL database using the Azure Java SDK:

import com.microsoft.azure.cosmosdb.ChangeFeedProcessor;
import com.microsoft.azure.cosmosdb.ChangeFeedProcessorBuilder;
import com.microsoft.azure.cosmosdb.ConnectionPolicy;
import com.microsoft.azure.cosmosdb.ConsistencyLevel;
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.FeedResponse;
import com.microsoft.azure.cosmosdb.PartitionKeyRange;

public class CosmosDBChangeFeedProcessor {

    private static final String ENDPOINT_URI = "https://<your-cosmosdb-account-name>.documents.azure.com:443/";
    private static final String PRIMARY_KEY = "<your-cosmosdb-primary-key>";
    private static final String DATABASE_NAME = "<your-cosmosdb-database-name>";
    private static final String COLLECTION_NAME = "<your-cosmosdb-collection-name>";

    public static void main(String[] args) throws DocumentClientException, InterruptedException {
        DocumentClient documentClient = new DocumentClient(ENDPOINT_URI, PRIMARY_KEY, ConnectionPolicy.GetDefault(), ConsistencyLevel.Session);

        FeedOptions feedOptions = new FeedOptions();
        feedOptions.setMaxItemCount(100);
        feedOptions.setPartitionKeyRangeId("0");
        feedOptions.setEnableCrossPartitionQuery(true);

        // Query the collection for partition key ranges
        FeedResponse<PartitionKeyRange> response = documentClient.readPartitionKeyRangeFeed(
                String.format("/dbs/%s/colls/%s/pkranges", DATABASE_NAME, COLLECTION_NAME), feedOptions);

        // Create the ChangeFeedProcessor instance
        ChangeFeedProcessor changeFeedProcessor = new ChangeFeedProcessorBuilder()
                .hostName("your-change-feed-processor-host-name")
                .feedCollection(documentClient, DATABASE_NAME, COLLECTION_NAME)
                .checkpointStoreCollection(documentClient, DATABASE_NAME, "your-checkpoint-store-collection-name")
                .handleChanges((docs, context) -> {
                    for (Document doc : docs) {
                        System.out.println("Received document change: " + doc.toJson());
                    }
                })
                .build();

        // Start the change feed processor
        changeFeedProcessor.start();
    }
}

In this code, the DocumentClient class is used to connect to the Cosmos DB database, and the ChangeFeedProcessor class is used to process the Change Feed of the database. The code defines a handler that is called for each set of changes to the database, and it simply prints the JSON representation of each changed document to the console.

assistant: Here is an example code for processing the Change Feed of a Cosmos DB NoSQL database using the Azure Java SDK:

```java
import com.microsoft.azure.cosmosdb.ChangeFeedOptions;
import com.microsoft.azure.cosmosdb.ConnectionPolicy;
import com.microsoft.azure.cosmosdb.Document;
import com.microsoft.azure.cosmosdb.DocumentClient;
import com.microsoft.azure.cosmosdb.FeedResponse;

import java.util.List;

public class CosmosDBChangeFeedExample {

    private static final String COSMOS_DB_END_POINT = "https://<your-cosmos-db-account>.documents.azure.com:443/";
    private static final String COSMOS_DB_MASTER_KEY = "<your-cosmos-db-master-key>";
    private static final String DATABASE_ID = "<your-database-id>";
    private static final String CONTAINER_ID = "<your-container-id>";

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

        ChangeFeedOptions options = new ChangeFeedOptions();
        options.setPartitionKeyRangeId("0");
        FeedResponse<Document> changeFeedResponse = documentClient.queryDocumentChangeFeed(
                String.format("/dbs/%s/colls/%s", DATABASE_ID, CONTAINER_ID), options);
        List<Document> results = changeFeedResponse.getResults();

        // Process the results of the change feed
        for (Document doc : results) {
            System.out.println("Change Feed Result: " + doc);
        }
    }
}

```

This code uses the `DocumentClient` class to connect to the Cosmos DB account and the `queryDocumentChangeFeed` method to retrieve the change feed of a specific container in the database. The `ChangeFeedOptions` class is used to set the partition key range ID to "0", but you can set it to a different value if necessary. The `FeedResponse` class contains the result of the change feed query, which is a list of `Document` objects. You can iterate through the list to process each document in the change feed.