2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2019 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.plugins.event.carrier.restclient;
24 import java.util.EnumMap;
26 import java.util.Optional;
27 import java.util.Properties;
30 import javax.ws.rs.client.Client;
31 import javax.ws.rs.client.ClientBuilder;
32 import javax.ws.rs.client.Entity;
33 import javax.ws.rs.core.Response;
35 import org.onap.policy.apex.service.engine.event.ApexEventException;
36 import org.onap.policy.apex.service.engine.event.ApexEventProducer;
37 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
38 import org.onap.policy.apex.service.engine.event.PeeredReference;
39 import org.onap.policy.apex.service.engine.event.SynchronousEventCache;
40 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
41 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
46 * Concrete implementation of an Apex event producer that sends events using REST.
48 * @author Joss Armstrong (joss.armstrong@ericsson.com)
51 public class ApexRestClientProducer implements ApexEventProducer {
52 private static final Logger LOGGER = LoggerFactory.getLogger(ApexRestClientProducer.class);
54 // The HTTP client that makes a REST call with an event from Apex
55 private Client client;
57 // The REST carrier properties
58 private RestClientCarrierTechnologyParameters restProducerProperties;
60 // The name for this producer
61 private String name = null;
63 // The peer references for this event handler
64 private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
70 public void init(final String producerName, final EventHandlerParameters producerParameters)
71 throws ApexEventException {
72 this.name = producerName;
74 // Check and get the REST Properties
75 if (!(producerParameters.getCarrierTechnologyParameters() instanceof RestClientCarrierTechnologyParameters)) {
76 final String errorMessage =
77 "specified producer properties are not applicable to REST client producer (" + this.name + ")";
78 LOGGER.warn(errorMessage);
79 throw new ApexEventException(errorMessage);
81 restProducerProperties =
82 (RestClientCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
84 // Check if the HTTP method has been set
85 if (restProducerProperties.getHttpMethod() == null) {
86 restProducerProperties.setHttpMethod(RestClientCarrierTechnologyParameters.HttpMethod.POST);
89 if (!RestClientCarrierTechnologyParameters.HttpMethod.POST.equals(restProducerProperties.getHttpMethod())
90 && !RestClientCarrierTechnologyParameters.HttpMethod.PUT
91 .equals(restProducerProperties.getHttpMethod())) {
92 final String errorMessage = "specified HTTP method of \"" + restProducerProperties.getHttpMethod()
93 + "\" is invalid, only HTTP methods \"POST\" and \"PUT\" are supproted "
94 + "for event sending on REST client producer (" + this.name + ")";
95 LOGGER.warn(errorMessage);
96 throw new ApexEventException(errorMessage);
99 // Initialize the HTTP client
100 client = ClientBuilder.newClient();
107 public String getName() {
115 public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
116 return peerReferenceMap.get(peeredMode);
123 public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
124 peerReferenceMap.put(peeredMode, peeredReference);
131 public void sendEvent(final long executionId, final Properties executionProperties, final String eventName,
132 final Object event) {
133 // Check if this is a synchronized event, if so we have received a reply
134 final SynchronousEventCache synchronousEventCache =
135 (SynchronousEventCache) peerReferenceMap.get(EventHandlerPeeredMode.SYNCHRONOUS);
136 if (synchronousEventCache != null) {
137 synchronousEventCache.removeCachedEventToApexIfExists(executionId);
140 String untaggedUrl = restProducerProperties.getUrl();
141 if (executionProperties != null) {
142 Set<String> names = restProducerProperties.getKeysFromUrl();
143 Set<String> inputProperty = executionProperties.stringPropertyNames();
145 names.stream().map(Optional::of).forEach(op ->
146 op.filter(inputProperty::contains)
147 .orElseThrow(() -> new ApexEventRuntimeException(
148 "key\"" + op.get() + "\"specified on url \"" + restProducerProperties.getUrl()
149 + "\"not found in execution properties passed by the current policy"))
152 untaggedUrl = names.stream().reduce(untaggedUrl,
153 (acc, str) -> acc.replace("{" + str + "}", (String) executionProperties.get(str)));
156 // Send the event as a REST request
157 final Response response = sendEventAsRestRequest(untaggedUrl, (String) event);
159 // Check that the request worked
160 if (response.getStatus() != Response.Status.OK.getStatusCode()) {
161 final String errorMessage = "send of event to URL \"" + untaggedUrl + "\" using HTTP \""
162 + restProducerProperties.getHttpMethod() + "\" failed with status code " + response.getStatus()
163 + " and message \"" + response.readEntity(String.class) + "\", event:\n" + event;
164 LOGGER.warn(errorMessage);
165 throw new ApexEventRuntimeException(errorMessage);
168 if (LOGGER.isTraceEnabled()) {
169 LOGGER.trace("event sent from engine using {} to URL {} with HTTP {} : {} and response {} ", this.name,
170 untaggedUrl, restProducerProperties.getHttpMethod(), event, response);
179 // Close the HTTP session
184 * Send the event as a JSON string as a REST request.
186 * @param event the event to send
187 * @return the response to the JSON request
189 private Response sendEventAsRestRequest(final String untaggedUrl, final String event) {
190 // We have already checked that it is a PUT or POST request
191 if (RestClientCarrierTechnologyParameters.HttpMethod.POST.equals(restProducerProperties.getHttpMethod())) {
192 return client.target(untaggedUrl).request("application/json")
193 .headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).post(Entity.json(event));
195 return client.target(untaggedUrl).request("application/json")
196 .headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).put(Entity.json(event));
201 * Hook for unit test mocking of HTTP client.
203 * @param client the mocked client
205 protected void setClient(final Client client) {
206 this.client = client;