Package com.microsoft.azure.functions.annotation

Annotation Type BlobOutput

  • @Retention(RUNTIME)
@Target({PARAMETER,METHOD})
public @interface BlobOutput

    Place this on a parameter whose value would be written to a blob. The parameter type should be OutputBinding<T>, where T could be one of:

    • Any native Java types such as int, String, byte[]
    • Any POJO type

    The following example shows blob input and output bindings in a Java function. The function makes a copy of a text blob. The function is triggered by a queue message that contains the name of the blob to copy. The new blob is named {originalblobname}-Copy.

    @FunctionName("copyTextBlob")
@StorageAccount("AzureWebJobsStorage")
@BlobOutput(name = "target", path = "samples-workitems/{queueTrigger}-Copy")
 public String blobCopy(
    @QueueTrigger(name = "filename",
                   queueName = "myqueue-items") String filename,
    @BlobInput(name = "source",
                path = "samples-workitems/{queueTrigger}") String content
 ) {
     return content;
 }
    Since:
    1.0.0

    • Required Element Summary

      Required Elements 
      Modifier and Type Required Element Description
      java.lang.String name
      The variable name used in function.json.
      java.lang.String path
      Defines the path of the blob to which to write.

    • Optional Element Summary

      Optional Elements 
      Modifier and Type Optional Element Description
      java.lang.String connection
      Defines the app setting name that contains the Azure Storage connection string.
      java.lang.String dataType
      Defines how Functions runtime should treat the parameter value.

    • Element Detail

      • name

        java.lang.String name
        The variable name used in function.json.
        Returns:
        The variable name used in function.json.

      • path

        java.lang.String path
        Defines the path of the blob to which to write.
        Returns:
        The blob path string.

      • dataType

        java.lang.String dataType

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

        • "" or string: treat it as a string whose value is serialized from the parameter
        • binary: treat it as a binary data whose value comes from for example OutputBinding<byte[]>
        Returns:
        The dataType which will be used by the Functions runtime.
        Default:
        ""

      • connection

        java.lang.String connection
        Defines the app setting name that contains the Azure Storage connection string.
        Returns:
        The app setting name of the connection string.
        Default:
        ""