[
https://issues.apache.org/jira/browse/NIFI-5015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16445332#comment-16445332
]
ASF GitHub Bot commented on NIFI-5015:
--------------------------------------
Github user zenfenan commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2611#discussion_r182948627
--- Diff:
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/queue/GetAzureQueueStorage.java
---
@@ -0,0 +1,208 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.nifi.processors.azure.storage.queue;
+
+import com.microsoft.azure.storage.StorageException;
+import com.microsoft.azure.storage.queue.CloudQueueMessage;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processors.azure.storage.utils.AzureStorageUtils;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Collections;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.concurrent.TimeUnit;
+
+@SeeAlso({PutAzureQueueStorage.class})
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@Tags({"azure", "queue", "microsoft", "storage", "dequeue", "cloud"})
+@CapabilityDescription("Retrieves the messages from an Azure Queue
Storage. The retrieved messages will be deleted from the queue by default. If
the requirement is " +
+ "to consume messages without deleting them, set 'Auto Delete
Messages' to 'false'.")
+@WritesAttributes({
+ @WritesAttribute(attribute = "azure.queue.uri", description = "The
absolute URI of the configured Azure Queue Storage"),
+ @WritesAttribute(attribute = "azure.queue.insertionTime",
description = "The time when the message was inserted into the queue storage"),
+ @WritesAttribute(attribute = "azure.queue.expirationTime",
description = "The time when the message will expire from the queue storage"),
+ @WritesAttribute(attribute = "azure.queue.messageId", description
= "The ID of the retrieved message"),
+ @WritesAttribute(attribute = "azure.queue.popReceipt", description
= "The pop receipt of the retrieved message"),
+})
+public class GetAzureQueueStorage extends AbstractAzureQueueStorage {
+
+ public static final PropertyDescriptor AUTO_DELETE = new
PropertyDescriptor.Builder()
+ .name("auto-delete-messages")
+ .displayName("Auto Delete Messages")
+ .description("Specifies whether the received message is to be
automatically deleted from the queue.")
+ .required(true)
+ .allowableValues("true", "false")
+ .defaultValue("true")
+ .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor BATCH_SIZE = new
PropertyDescriptor.Builder()
+ .name("batch-size")
+ .displayName("Batch Size")
+ .description("The number of messages to be retrieved from the
queue.")
+ .required(true)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("32")
+ .build();
+
+ public static final PropertyDescriptor VISIBILITY_TIMEOUT = new
PropertyDescriptor.Builder()
+ .name("visibility-timeout")
+ .displayName("Visibility Timeout")
+ .description("The duration during which the retrieved message
should be invisible to other consumers.")
+ .required(true)
+ .defaultValue("30 secs")
+ .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
+ .build();
+
+ private static final List<PropertyDescriptor> properties =
Collections.unmodifiableList(Arrays.asList(
+ AzureStorageUtils.ACCOUNT_NAME, AzureStorageUtils.ACCOUNT_KEY,
AzureStorageUtils.PROP_SAS_TOKEN, QUEUE, AUTO_DELETE,
+ BATCH_SIZE, VISIBILITY_TIMEOUT));
+
+ @Override
+ public List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return properties;
+ }
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return Collections.singleton(REL_SUCCESS);
+ }
+
+ @Override
+ public void onTrigger(ProcessContext context, ProcessSession session)
throws ProcessException {
+
+ final int visibilityTimeoutInSecs =
context.getProperty(VISIBILITY_TIMEOUT).asTimePeriod(TimeUnit.SECONDS).intValue();
+ final int batchSize = context.getProperty(BATCH_SIZE).asInteger();
+ final boolean autoDelete =
context.getProperty(AUTO_DELETE).asBoolean();
+
+ final Iterable<CloudQueueMessage> retrievedMessagesIterable;
+
+ try {
+ retrievedMessagesIterable =
cloudQueue.retrieveMessages(batchSize, visibilityTimeoutInSecs, null, null);
+ } catch (final StorageException e) {
+ getLogger().error("Failed to retrieve messages from the
provided Azure Storage Queue due to {}", new Object[] {e});
+ context.yield();
+ return;
+ }
+
+ final List<CloudQueueMessage> cloudQueueMessages =
toList(retrievedMessagesIterable);
+
+ for (final CloudQueueMessage message : cloudQueueMessages) {
+ FlowFile flowFile = session.create();
+
+ final Map<String, String> attributes = new HashMap<>();
+
+ attributes.put("azure.queue.uri",
cloudQueue.getUri().toString());
+ attributes.put("azure.queue.insertionTime",
message.getInsertionTime().toString());
+ attributes.put("azure.queue.expirationTime",
message.getExpirationTime().toString());
+ attributes.put("azure.queue.messageId",
message.getMessageId());
+ attributes.put("azure.queue.popReceipt",
message.getPopReceipt());
+
+ flowFile = session.putAllAttributes(flowFile, attributes);
+ flowFile = session.write(flowFile, out -> {
+ try {
+ out.write(message.getMessageContentAsByte());
+ } catch (StorageException e) {
+ getLogger().error("Failed to write the retrieved queue
message to FlowFile content due to {}", new Object[] {e});
+ context.yield();
+ }
+ });
+
+ session.transfer(flowFile, REL_SUCCESS);
+ session.getProvenanceReporter().receive(flowFile,
cloudQueue.getStorageUri().toString());
+ }
+
+ if(autoDelete) {
+ session.commit();
+
+ for (final CloudQueueMessage message : cloudQueueMessages) {
+ try {
+ cloudQueue.deleteMessage(message);
+ } catch (StorageException e) {
+ getLogger().error("Failed to delete the retrieved
message with the id {} from the queue due to {}",
+ new Object[] {message.getMessageId(), e});
+ }
+ }
+ }
+
+ }
+
+ @Override
+ public Collection<ValidationResult> customValidate(final
ValidationContext validationContext) {
+ final List<ValidationResult> problems = new
ArrayList<>(super.customValidate(validationContext));
+
+ final int batchSize =
validationContext.getProperty(BATCH_SIZE).asInteger();
+
+ //Azure Queue Storage supports only a max of 32 messages to be
retrieved in a single invocation
+ if (batchSize > 32) {
+ problems.add(new ValidationResult.Builder()
+ .valid(false)
+
.subject(BATCH_SIZE.getDisplayName())
+ .explanation("only up to 32
messages can be retrieved at a time")
+ .build()
+ );
+ }
+
+ final int visibilityTimeout =
validationContext.getProperty(VISIBILITY_TIMEOUT).asTimePeriod(TimeUnit.SECONDS).intValue();
+
+ if (visibilityTimeout <= 0) {
--- End diff --
My bad.. I'll fix it.
> Develop Azure Queue Storage processors
> --------------------------------------
>
> Key: NIFI-5015
> URL: https://issues.apache.org/jira/browse/NIFI-5015
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Sivaprasanna Sethuraman
> Assignee: Sivaprasanna Sethuraman
> Priority: Minor
>
> Develop NiFi processors bundle for Azure Queue Storage
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