2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights
7 * ================================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 * ============LICENSE_END=========================================================
24 package org.openecomp.appc.adapter.rest.impl;
26 import org.openecomp.appc.Constants;
27 import org.openecomp.appc.configuration.Configuration;
28 import org.openecomp.appc.configuration.ConfigurationFactory;
29 import org.openecomp.sdnc.sli.SvcLogicContext;
32 * This class is used to track and maintain recovery and time-to-live information for a request as it is being
35 public class RequestContext {
37 * The number of seconds of wait time between successive attempts to connect to the provider. This is used to
38 * recover from provider outages or failures. It is not used to recover from logical errors, such as an invalid
39 * request, server not found, etc.
41 private Integer retryDelay;
44 * The number of times we will attempt to connect to the provider. This is used to recover from provider outages or
45 * failures. It is not used to recover from logical errors, such as an invalid request, server not found, etc.
47 private Integer retryLimit;
50 * The total time, in milliseconds, that the provider can have to process this request. If the accumulated time
51 * exceeds the time to live, then the request is failed with a timeout exception, regardless of the state of the
52 * provider. Note that the caller may supply this as a value in seconds, in which case it must be converted to
53 * milliseconds for the request context.
55 private Long timeToLive;
58 * The accumulated time, in milliseconds, that has been used so far to process the request. This is compared to the
59 * time to live each time it is updated. If the accumulated time exceeds the time to live, then the request is
60 * failed with a timeout exception, regardless of the state of the provider.
62 private long accumulatedTime;
65 * The total number of retries attempted so far
70 * The time when the stopwatch was started
72 private long startTime = -1;
75 * The service logic (DG) context from the SLI
77 private SvcLogicContext svcLogicContext;
82 private Configuration configuration = ConfigurationFactory.getConfiguration();
85 * Set to true whenever the retry limit has been exceeded, reset to false when reset() is called.
87 private boolean retryFailed;
90 * Creates the request context
93 * The service logic (SLI) context associated with the current DG
95 public RequestContext(SvcLogicContext context) {
96 setSvcLogicContext(context);
100 * @return The retry delay, in seconds. If zero, then no retry is to be performed
102 public int getRetryDelay() {
103 if (retryDelay == null) {
104 int value = configuration.getIntegerProperty(Constants.PROPERTY_RETRY_DELAY);
105 retryDelay = Integer.valueOf(value);
108 return retryDelay.intValue();
112 * This method is a helper that allows the caller to delay for the retry interval time and not have to handle the
113 * thread interruption, timer handling, etc.
115 public void delay() {
116 long time = getRetryDelay() * 1000L;
117 long future = System.currentTimeMillis() + time;
119 while (System.currentTimeMillis() < future && time > 0) {
122 } catch (InterruptedException e) {
124 * This is rare, but it can happen if another thread interrupts us while we are sleeping. In that
125 * case, the thread is resumed before the delay time has actually expired, so re-calculate the
126 * amount of delay time needed and reenter the sleep until we get to the future time.
128 time = future - System.currentTimeMillis();
135 * @return The number of retries that are allowed per connection
137 public int getRetryLimit() {
138 if (retryLimit == null) {
139 int value = configuration.getIntegerProperty(Constants.PROPERTY_RETRY_LIMIT);
140 retryLimit = Integer.valueOf(value);
143 return retryLimit.intValue();
147 * Check and count the connection attempt.
149 * @return True if the connection should be attempted. False indicates that the number of retries has been exhausted
150 * and it should NOT be attempted.
152 public boolean attempt() {
153 if (retryFailed || attempt >= getRetryLimit()) {
163 * @return The number of retry attempts so far
165 public int getAttempts() {
170 * @return True if the retry limit has been exceeded, false otherwise
172 public boolean isFailed() {
177 * This method both checks the time to live to see if it has been exceeded and accumulates the total time used so
180 * Each time this method is called it accumulates the total duration since the last time it was called to the total
181 * time accumulator. It then checks the total time to the time to live and if greater, it returns false. As long as
182 * the total time used is less than or equal to the time to live limit, the method returns true. It is important to
183 * call this method at the very beginning of the process so that all parts of the process are tracked.
186 * @return True if the total time to live has not been exceeded. False indicates that the total time to live has
187 * been exceeded and no further processing should be performed.
189 public boolean isAlive() {
190 long now = System.currentTimeMillis();
191 if (startTime == -1) {
195 accumulatedTime += (now - startTime);
197 if (accumulatedTime > timeToLive) {
204 * @return The total amount of time used, in milliseconds.
206 public long getTotalDuration() {
207 return accumulatedTime;
211 * This method is called to reset the retry counters. It has no effect on the time to live accumulator.
213 public void reset() {
218 * Sets the time to live to the value, expressed in seconds
221 * The time to live, in seconds
223 public void setTimeToLiveSeconds(int time) {
224 setTimeToLiveMS(time * 1000L);
228 * Sets the time to live to the value, expressed in milliseconds
231 * The time to live, in milliseconds
233 public void setTimeToLiveMS(long time) {
234 this.timeToLive = time;
238 * @return The service logic context associated with this request
240 public SvcLogicContext getSvcLogicContext() {
241 return svcLogicContext;
245 * @param svcLogicContext
246 * The service logic context to be associated with this request
248 public void setSvcLogicContext(SvcLogicContext svcLogicContext) {
249 this.svcLogicContext = svcLogicContext;