Java tutorial
/* * 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.aws.dynamodb; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.commons.lang3.StringUtils; import org.apache.nifi.annotation.behavior.InputRequirement; import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; import org.apache.nifi.annotation.behavior.ReadsAttribute; import org.apache.nifi.annotation.behavior.ReadsAttributes; import org.apache.nifi.annotation.behavior.SupportsBatching; 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.flowfile.FlowFile; import org.apache.nifi.processor.ProcessContext; import org.apache.nifi.processor.ProcessSession; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.services.dynamodbv2.document.BatchWriteItemOutcome; import com.amazonaws.services.dynamodbv2.document.DynamoDB; import com.amazonaws.services.dynamodbv2.document.TableWriteItems; import com.amazonaws.services.dynamodbv2.model.AttributeValue; import com.amazonaws.services.dynamodbv2.model.WriteRequest; @SupportsBatching @SeeAlso({ GetDynamoDB.class, PutDynamoDB.class }) @InputRequirement(Requirement.INPUT_REQUIRED) @Tags({ "Amazon", "DynamoDB", "AWS", "Delete", "Remove" }) @CapabilityDescription("Deletes a document from DynamoDB based on hash and range key. The key can be string or number." + " The request requires all the primary keys for the operation (hash or hash and range key)") @WritesAttributes({ @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_KEY_ERROR_UNPROCESSED, description = "Dynamo db unprocessed keys"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_RANGE_KEY_VALUE_ERROR, description = "Dynamod db range key error"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_KEY_ERROR_NOT_FOUND, description = "Dynamo db key not found"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_EXCEPTION_MESSAGE, description = "Dynamo db exception message"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_CODE, description = "Dynamo db error code"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_MESSAGE, description = "Dynamo db error message"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_TYPE, description = "Dynamo db error type"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_SERVICE, description = "Dynamo db error service"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_RETRYABLE, description = "Dynamo db error is retryable"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_REQUEST_ID, description = "Dynamo db error request id"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ERROR_STATUS_CODE, description = "Dynamo db status code") }) @ReadsAttributes({ @ReadsAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ITEM_HASH_KEY_VALUE, description = "Items hash key value"), @ReadsAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ITEM_RANGE_KEY_VALUE, description = "Items range key value"), }) public class DeleteDynamoDB extends AbstractWriteDynamoDBProcessor { public static final List<PropertyDescriptor> properties = Collections .unmodifiableList(Arrays.asList(TABLE, HASH_KEY_NAME, RANGE_KEY_NAME, HASH_KEY_VALUE, RANGE_KEY_VALUE, HASH_KEY_VALUE_TYPE, RANGE_KEY_VALUE_TYPE, BATCH_SIZE, REGION, ACCESS_KEY, SECRET_KEY, CREDENTIALS_FILE, AWS_CREDENTIALS_PROVIDER_SERVICE, TIMEOUT, SSL_CONTEXT_SERVICE)); @Override protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { return properties; } @Override public void onTrigger(final ProcessContext context, final ProcessSession session) { List<FlowFile> flowFiles = session .get(context.getProperty(BATCH_SIZE).evaluateAttributeExpressions().asInteger()); if (flowFiles == null || flowFiles.size() == 0) { return; } Map<ItemKeys, FlowFile> keysToFlowFileMap = new HashMap<>(); final String table = context.getProperty(TABLE).evaluateAttributeExpressions().getValue(); final String hashKeyName = context.getProperty(HASH_KEY_NAME).evaluateAttributeExpressions().getValue(); final String hashKeyValueType = context.getProperty(HASH_KEY_VALUE_TYPE).getValue(); final String rangeKeyName = context.getProperty(RANGE_KEY_NAME).evaluateAttributeExpressions().getValue(); final String rangeKeyValueType = context.getProperty(RANGE_KEY_VALUE_TYPE).getValue(); TableWriteItems tableWriteItems = new TableWriteItems(table); for (FlowFile flowFile : flowFiles) { final Object hashKeyValue = getValue(context, HASH_KEY_VALUE_TYPE, HASH_KEY_VALUE, flowFile); final Object rangeKeyValue = getValue(context, RANGE_KEY_VALUE_TYPE, RANGE_KEY_VALUE, flowFile); if (!isHashKeyValueConsistent(hashKeyName, hashKeyValue, session, flowFile)) { continue; } if (!isRangeKeyValueConsistent(rangeKeyName, rangeKeyValue, session, flowFile)) { continue; } if (rangeKeyValue == null || StringUtils.isBlank(rangeKeyValue.toString())) { tableWriteItems.addHashOnlyPrimaryKeysToDelete(hashKeyName, hashKeyValue); } else { tableWriteItems.addHashAndRangePrimaryKeyToDelete(hashKeyName, hashKeyValue, rangeKeyName, rangeKeyValue); } keysToFlowFileMap.put(new ItemKeys(hashKeyValue, rangeKeyValue), flowFile); } if (keysToFlowFileMap.isEmpty()) { return; } final DynamoDB dynamoDB = getDynamoDB(); try { BatchWriteItemOutcome outcome = dynamoDB.batchWriteItem(tableWriteItems); handleUnprocessedItems(session, keysToFlowFileMap, table, hashKeyName, hashKeyValueType, rangeKeyName, rangeKeyValueType, outcome); // All non unprocessed items are successful for (FlowFile flowFile : keysToFlowFileMap.values()) { getLogger().debug("Successfully deleted item from dynamodb : " + table); session.transfer(flowFile, REL_SUCCESS); } } catch (AmazonServiceException exception) { getLogger().error("Could not process flowFiles due to service exception : " + exception.getMessage()); List<FlowFile> failedFlowFiles = processServiceException(session, flowFiles, exception); session.transfer(failedFlowFiles, REL_FAILURE); } catch (AmazonClientException exception) { getLogger().error("Could not process flowFiles due to client exception : " + exception.getMessage()); List<FlowFile> failedFlowFiles = processClientException(session, flowFiles, exception); session.transfer(failedFlowFiles, REL_FAILURE); } catch (Exception exception) { getLogger().error("Could not process flowFiles due to exception : " + exception.getMessage()); List<FlowFile> failedFlowFiles = processException(session, flowFiles, exception); session.transfer(failedFlowFiles, REL_FAILURE); } } /** * {@inheritDoc} */ protected Map<String, AttributeValue> getRequestItem(WriteRequest writeRequest) { return writeRequest.getDeleteRequest().getKey(); } }