Package com.github.ambry.cloud.azure

Class CosmosChangeFeedBasedReplicationFeed

java.lang.Object

com.github.ambry.cloud.azure.CosmosChangeFeedBasedReplicationFeed

All Implemented Interfaces:

AzureReplicationFeed, java.io.Closeable, java.lang.AutoCloseable

public final class CosmosChangeFeedBasedReplicationFeed
extends java.lang.Object
implements AzureReplicationFeed

The replication feed that provides next list of blobs to replicate from Azure and corresponding FindToken using Cosmos change feed apis.

Nested Class Summary

Nested classes/interfaces inherited from interface com.github.ambry.cloud.azure.AzureReplicationFeed

AzureReplicationFeed.FeedType

Constructor Summary

Constructors

Constructor	Description
CosmosChangeFeedBasedReplicationFeed(CosmosDataAccessor cosmosDataAccessor, AzureMetrics azureMetrics, int changeFeedBatchSize)	Constructor to create a CosmosChangeFeedBasedReplicationFeed object.

Method Summary

Modifier and Type	Method	Description
void	close()
FindResult	getNextEntriesAndUpdatedToken(com.github.ambry.replication.FindToken curFindToken, long maxTotalSizeOfEntries, java.lang.String partitionPath)	Get next set of change feed entries for the specified partition, after the curFindToken.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CosmosChangeFeedBasedReplicationFeed

public CosmosChangeFeedBasedReplicationFeed(CosmosDataAccessor cosmosDataAccessor,
                                            AzureMetrics azureMetrics,
                                            int changeFeedBatchSize)

Constructor to create a CosmosChangeFeedBasedReplicationFeed object.

Parameters:

cosmosDataAccessor - CosmosDataAccessor object.

azureMetrics - {@link {@link AzureMetrics} object.

changeFeedBatchSize - batch size for each change feed request.

Method Detail

getNextEntriesAndUpdatedToken

public FindResult getNextEntriesAndUpdatedToken(com.github.ambry.replication.FindToken curFindToken,
                                                long maxTotalSizeOfEntries,
                                                java.lang.String partitionPath)
                                         throws com.microsoft.azure.cosmosdb.DocumentClientException

Get next set of change feed entries for the specified partition, after the curFindToken. The number of entries is capped by maxEntriesSize. This method creates a cache for change feed entries. If the curFindToken is not valid, or if all the items in the cache are consumed, then it queries Cosmos for new entries.

Specified by:

getNextEntriesAndUpdatedToken in interface AzureReplicationFeed

Parameters:

curFindToken - FindToken after which the next entries have to be returned.

maxTotalSizeOfEntries - maximum size of all the blobs returned.

partitionPath - Partition for which change feed entries have to be returned.

Returns:

FindResult instance that contains updated FindToken object which can act as a bookmark for subsequent requests, and List of CloudBlobMetadata entries.

Throws:

com.microsoft.azure.cosmosdb.DocumentClientException - if any cosmos query encounters error.

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable