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.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.commons.io.IOUtils; import org.apache.commons.lang3.StringUtils; import org.apache.nifi.annotation.behavior.InputRequirement; import org.apache.nifi.annotation.behavior.ReadsAttribute; import org.apache.nifi.annotation.behavior.ReadsAttributes; import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; 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.Item; import com.amazonaws.services.dynamodbv2.document.TableWriteItems; import com.amazonaws.services.dynamodbv2.model.AttributeValue; import com.amazonaws.services.dynamodbv2.model.WriteRequest; @SupportsBatching @SeeAlso({ DeleteDynamoDB.class, GetDynamoDB.class }) @InputRequirement(Requirement.INPUT_REQUIRED) @Tags({ "Amazon", "DynamoDB", "AWS", "Put", "Insert" }) @CapabilityDescription("Puts a document from DynamoDB based on hash and range key. The table can have either hash and range or hash key alone." + " Currently the keys supported are string and number and value can be json document. " + "In case of hash and range keys both key are required for the operation." + " The FlowFile content must be JSON. FlowFile content is mapped to the specified Json Document attribute in the DynamoDB item.") @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 error status code"), @WritesAttribute(attribute = AbstractDynamoDBProcessor.DYNAMODB_ITEM_IO_ERROR, description = "IO exception message on creating item") }) @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 PutDynamoDB 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, JSON_DOCUMENT, DOCUMENT_CHARSET, BATCH_SIZE, REGION, ACCESS_KEY, SECRET_KEY, CREDENTIALS_FILE, AWS_CREDENTIALS_PROVIDER_SERVICE, TIMEOUT, SSL_CONTEXT_SERVICE)); /** * Dyamodb max item size limit 400 kb */ public static final int DYNAMODB_MAX_ITEM_SIZE = 400 * 1024; @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(); final String jsonDocument = context.getProperty(JSON_DOCUMENT).evaluateAttributeExpressions().getValue(); final String charset = context.getProperty(DOCUMENT_CHARSET).evaluateAttributeExpressions().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 (!isDataValid(flowFile, jsonDocument)) { flowFile = session.putAttribute(flowFile, AWS_DYNAMO_DB_ITEM_SIZE_ERROR, "Max size of item + attribute should be 400kb but was " + flowFile.getSize() + jsonDocument.length()); session.transfer(flowFile, REL_FAILURE); continue; } ByteArrayOutputStream baos = new ByteArrayOutputStream(); session.exportTo(flowFile, baos); try { if (rangeKeyValue == null || StringUtils.isBlank(rangeKeyValue.toString())) { tableWriteItems.addItemToPut(new Item().withKeyComponent(hashKeyName, hashKeyValue) .withJSON(jsonDocument, IOUtils.toString(baos.toByteArray(), charset))); } else { tableWriteItems.addItemToPut(new Item().withKeyComponent(hashKeyName, hashKeyValue) .withKeyComponent(rangeKeyName, rangeKeyValue) .withJSON(jsonDocument, IOUtils.toString(baos.toByteArray(), charset))); } } catch (IOException ioe) { getLogger().error("IOException while creating put item : " + ioe.getMessage()); flowFile = session.putAttribute(flowFile, DYNAMODB_ITEM_IO_ERROR, ioe.getMessage()); session.transfer(flowFile, REL_FAILURE); } 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); // Handle any remaining flowfiles for (FlowFile flowFile : keysToFlowFileMap.values()) { getLogger().debug("Successful posted items to 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); } } private boolean isDataValid(FlowFile flowFile, String jsonDocument) { return (flowFile.getSize() + jsonDocument.length()) < DYNAMODB_MAX_ITEM_SIZE; } /** * {@inheritDoc} */ protected Map<String, AttributeValue> getRequestItem(WriteRequest writeRequest) { return writeRequest.getPutRequest().getItem(); } }