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CosmosDBTrigger Interface

Implements

java.lang.annotation.Annotation

public interface CosmosDBTrigger
implements java.lang.annotation.Annotation

Place this on a parameter whose value would come from CosmosDB, and causing the method to run when CosmosDB data is changed. The parameter type can be one of the following:

  • Some native Java types such as String
  • Nullable values using Optional
  • Any POJO type

The following example shows a Java function that is invoked when there are inserts or updates in the specified database and collection.

@FunctionName("cosmosDBMonitor")
 public void cosmosDbLog(
    @CosmosDBTrigger(name = "database",
                      databaseName = "ToDoList",
                      collectionName = "Items",
                      leaseCollectionName = "leases",
                      createLeaseCollectionIfNotExists = true,
                      connectionStringSetting = "AzureCosmosDBConnection") 
                      List<Map<String, String>> items,
     final ExecutionContext context
 ) {
     context.getLogger().info(items.size() + " item(s) is/are inserted.");
     if (!items.isEmpty()) {
         context.getLogger().info("The ID of the first item is: " + items.get(0).get("id"));
     }
 }

Method Summary

Modifier and Type Method and Description
abstract int checkpointDocumentCount()

Customizes the amount of documents between lease checkpoints.

abstract int checkpointInterval()

Customizes the amount of milliseconds between lease checkpoints.

abstract java.lang.String collectionName()

Defines the collection name of the CosmosDB to which to bind.

abstract java.lang.String connectionStringSetting()

Defines the app setting name that contains the CosmosDB connection string.

abstract boolean createLeaseCollectionIfNotExists()

Defines whether to create a new lease collection if not exists.

abstract java.lang.String dataType()

Defines how Functions runtime should treat the parameter value.

abstract java.lang.String databaseName()

Defines the database name of the CosmosDB to which to bind.

abstract int feedPollDelay()

Customizes the delay in milliseconds in between polling a partition for new changes on the feed, after all current changes are drained.

abstract int leaseAcquireInterval()

Customizes the interval in milliseconds to kick off a task to compute if partitions are distributed evenly among known host instances.

abstract java.lang.String leaseCollectionName()

Defines the lease collection name of the CosmosDB to which to bind.

abstract java.lang.String leaseCollectionPrefix()

Defines a prefix to be used within a Leases collection for this Trigger.

abstract java.lang.String leaseConnectionStringSetting()

Defines Connection string for the service containing the lease collection.

abstract java.lang.String leaseDatabaseName()

Defines Name of the database containing the lease collection.

abstract int leaseExpirationInterval()

Customizes the interval in milliseconds for which the lease is taken on a lease representing a partition.

abstract int leaseRenewInterval()

Customizes the renew interval in milliseconds for all leases for partitions currently held by the Trigger.

abstract int leasesCollectionThroughput()

defines the throughput of the created collection..

abstract int maxItemsPerInvocation()

Customizes the maximum amount of items received in an invocation

abstract java.lang.String name()

The variable name used in function.json.

abstract java.lang.String preferredLocations()

Defines preferred locations (regions) for geo-replicated database accounts in the Azure Cosmos DB service.

abstract boolean startFromBeginning()

Gets or sets whether change feed in the Azure Cosmos DB service should start from beginning (true) or from current (false).

Method Details

checkpointDocumentCount

public abstract int checkpointDocumentCount()

Customizes the amount of documents between lease checkpoints. Default is always after a Function call.

Returns:

CheckpointDocumentCount

checkpointInterval

public abstract int checkpointInterval()

Customizes the amount of milliseconds between lease checkpoints. Default is always after a Function call.

Returns:

checkpointInterval

collectionName

public abstract String collectionName()

Defines the collection name of the CosmosDB to which to bind.

Returns:

The collection name string.

connectionStringSetting

public abstract String connectionStringSetting()

Defines the app setting name that contains the CosmosDB connection string.

Returns:

The app setting name of the connection string.

createLeaseCollectionIfNotExists

public abstract boolean createLeaseCollectionIfNotExists()

Defines whether to create a new lease collection if not exists.

Returns:

configuration whether to create a new lease collection if not exists.

dataType

public abstract String dataType()

Defines how Functions runtime should treat the parameter value. Possible values are:

  • "": get the value as a string, and try to deserialize to actual parameter type like POJO
  • string: always get the value as a string
  • binary: get the value as a binary data, and try to deserialize to actual parameter type byte[]

Returns:

The dataType which will be used by the Functions runtime.

databaseName

public abstract String databaseName()

Defines the database name of the CosmosDB to which to bind.

Returns:

The database name string.

feedPollDelay

public abstract int feedPollDelay()

Customizes the delay in milliseconds in between polling a partition for new changes on the feed, after all current changes are drained. Default is 5000 (5 seconds).

Returns:

feedPollDelay

leaseAcquireInterval

public abstract int leaseAcquireInterval()

Customizes the interval in milliseconds to kick off a task to compute if partitions are distributed evenly among known host instances. Default is 13000 (13 seconds).

Returns:

interval in milliseconds

leaseCollectionName

public abstract String leaseCollectionName()

Defines the lease collection name of the CosmosDB to which to bind.

Returns:

The lease collection name string.

leaseCollectionPrefix

public abstract String leaseCollectionPrefix()

Defines a prefix to be used within a Leases collection for this Trigger. Useful when sharing the same Lease collection among multiple Triggers.

Returns:

LeaseCollectionPrefix

leaseConnectionStringSetting

public abstract String leaseConnectionStringSetting()

Defines Connection string for the service containing the lease collection.

Returns:

Connection string for the lease collection.

leaseDatabaseName

public abstract String leaseDatabaseName()

Defines Name of the database containing the lease collection.

Returns:

Name of the database for lease collection.

leaseExpirationInterval

public abstract int leaseExpirationInterval()

Customizes the interval in milliseconds for which the lease is taken on a lease representing a partition. If the lease is not renewed within this interval, it will cause it to expire and ownership of the partition will move to another Trigger instance. Default is 60000 (60 seconds).

Returns:

interval in milliseconds for which the lease is taken

leaseRenewInterval

public abstract int leaseRenewInterval()

Customizes the renew interval in milliseconds for all leases for partitions currently held by the Trigger. Default is 17000 (17 seconds).

Returns:

renew interval in milliseconds for all leases

leasesCollectionThroughput

public abstract int leasesCollectionThroughput()

defines the throughput of the created collection..

Returns:

throughput

maxItemsPerInvocation

public abstract int maxItemsPerInvocation()

Customizes the maximum amount of items received in an invocation

Returns:

maximum amount of items received

name

public abstract String name()

The variable name used in function.json.

Returns:

The variable name used in function.json.

preferredLocations

public abstract String preferredLocations()

Defines preferred locations (regions) for geo-replicated database accounts in the Azure Cosmos DB service. Values should be comma-separated. example, PreferredLocations = "East US,South Central US,North Europe"

Returns:

preferred locations (regions) for geo-replicated database accounts

startFromBeginning

public abstract boolean startFromBeginning()

Gets or sets whether change feed in the Azure Cosmos DB service should start from beginning (true) or from current (false). By default it's start from current (false).

Returns:

Configuration whether change feed should start from beginning

Applies to