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IPP Java V3 DevKit Project - Core
/*******************************************************************************
* Copyright (c) 2017 Intuit
*
* Licensed 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 com.intuit.ipp.net;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ConnectException;
import java.net.ProtocolException;
import java.net.UnknownHostException;
import javax.net.ssl.SSLException;
import javax.security.sasl.SaslException;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.NoHttpResponseException;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.protocol.HttpCoreContext;
import org.apache.http.protocol.HttpContext;
import com.intuit.ipp.exception.ConfigurationException;
import com.intuit.ipp.util.Config;
import com.intuit.ipp.util.Logger;
/**
* Class to handle retry policy
*
*/
public class IntuitRetryPolicyHandler implements HttpRequestRetryHandler {
/**
* logger instance
*/
private static final org.slf4j.Logger LOG = Logger.getLogger();
/**
* variable NUM_0_8
*/
private static final double NUM_0_8 = 0.8;
/**
* variable NUM_1_2
*/
private static final double NUM_1_2 = 1.2;
/**
* variable retryCount
*/
private int retryCount;
/**
* variable retryInterval
*/
private int retryInterval;
/**
* variable initialInterval
* the initial interval that will be applied for the first time
*/
private int initialInterval;
/**
* variable increment
* The incremental time value that will be used for calculating the progressive delay between retries.
*/
private int increment;
/**
* variable minBackoff
* the minimum Backoff time
*/
private int minBackoff;
/**
* variable
*/
// the maximum Backoff time
private int maxBackoff;
/**
* variable deltaBackoff
* the maximum DeltaBackOff time
*/
private int deltaBackoff;
/**
* variable mechanism
* string to represent which type of retry mechanism
*/
private String mechanism;
/**
* Initialize a new instance of the RetryPolicyHandler class
*
* @param retryCount the retry count
* @param retryInterval the retry interval
* @throws ConfigurationException the configuration exception
*/
public IntuitRetryPolicyHandler(int retryCount, int retryInterval) throws ConfigurationException {
RetryHelper.argumentNotNegativeValue(retryCount, Config.RETRY_FIXED_COUNT);
RetryHelper.argumentNotNegativeValue(retryInterval, Config.RETRY_FIXED_INTERVAL);
this.retryCount = retryCount;
this.retryInterval = retryInterval;
mechanism = "fixedretry";
}
/**
* Initialize a new instance of the RetryPolicyHandler class
*
* @param retryCount the retry count
* @param initialInterval the initial interval
* @param increment the increment
* @throws ConfigurationException the configuration exception
*/
public IntuitRetryPolicyHandler(int retryCount, int initialInterval, int increment) throws ConfigurationException {
RetryHelper.argumentNotNegativeValue(retryCount, Config.RETRY_INCREMENTAL_COUNT);
RetryHelper.argumentNotNegativeValue(initialInterval, Config.RETRY_INCREMENTAL_INTERVAL);
RetryHelper.argumentNotNegativeValue(increment, Config.RETRY_INCREMENTAL_INCREMENT);
this.retryCount = retryCount;
this.initialInterval = initialInterval;
this.increment = increment;
mechanism = "incrementalretry";
}
/**
* Initialize a new instance of the RetryPolicyHandler class
*
* @param retryCount the retry cont
* @param minBackoff the min backoff
* @param maxBackoff the max backoff
* @param deltaBackoff the delta backoff
* @throws ConfigurationException the configuration exception
*/
public IntuitRetryPolicyHandler(int retryCount, int minBackoff, int maxBackoff, int deltaBackoff) throws ConfigurationException {
RetryHelper.argumentNotNegativeValue(retryCount, Config.RETRY_EXPONENTIAL_COUNT);
RetryHelper.argumentNotNegativeValue(minBackoff, Config.RETRY_EXPONENTIAL_MIN_BACKOFF);
RetryHelper.argumentNotNegativeValue(maxBackoff, Config.RETRY_EXPONENTIAL_MAX_BACKOFF);
RetryHelper.argumentNotNegativeValue(deltaBackoff, Config.RETRY_EXPONENTIAL_DELTA_BACKOFF);
this.retryCount = retryCount;
this.minBackoff = minBackoff;
this.maxBackoff = maxBackoff;
this.deltaBackoff = deltaBackoff;
mechanism = "exponentialretry";
}
/**
* method to validate the retry policies
*
* @return boolean
*/
public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
LOG.debug("In retry request");
if (exception == null) {
throw new IllegalArgumentException("Exception parameter may not be null");
} else if (context == null) {
throw new IllegalArgumentException("HTTP context may not be null");
}
if (executionCount > this.retryCount) {
return checkPolicy(executionCount);
} else if (exception instanceof NoHttpResponseException) {
// Retry if the server dropped connection on us
return checkPolicy(executionCount);
} else if (exception instanceof InterruptedIOException) {
// Timeout
return false;
} else if (exception instanceof UnknownHostException) {
// Unknown host
return false;
} else if (exception instanceof ConnectException) {
// Connection refused
return false;
} else if (exception instanceof SSLException) {
// SSL handshake exception
return false;
} else if (exception instanceof ProtocolException) {
// protocol exception
return false;
} else if (exception instanceof SaslException) {
// Sasl exception
return false;
}
HttpRequest request = (HttpRequest) context.getAttribute(HttpCoreContext.HTTP_REQUEST);
boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
if (idempotent) {
// Retry if the request is considered idempotent
return checkPolicy(executionCount);
}
Boolean b = (Boolean) context.getAttribute(HttpCoreContext.HTTP_REQ_SENT);
boolean sent = (b != null && b.booleanValue());
// if (!sent || this.requestSentRetryEnabled) {
// Retry if the request has not been sent fully or
// if it's OK to retry methods that have been sent
if (!sent) {
return checkPolicy(executionCount);
}
// otherwise do not retry
return false;
}
/**
* Method to check the retry request policy
*
* @param executionCount the execution count
* @return boolean
*/
private boolean checkPolicy(int executionCount) {
if (mechanism.equalsIgnoreCase("fixedretry")) {
if (this.retryCount == 0) {
return false;
} else if (executionCount < this.retryCount) {
try {
Thread.sleep((long) this.retryInterval);
LOG.debug("The retryInterval " + this.retryInterval);
return true;
} catch (Exception e) {
LOG.error(e.getMessage());
}
}
return false;
}
// functionality for incremental retry policy
if (mechanism.equalsIgnoreCase("incrementalretry")) {
if (executionCount < this.retryCount) {
try {
Thread.sleep((long) this.initialInterval + (this.increment * executionCount));
return true;
} catch (Exception e) {
LOG.error(e.getMessage());
}
}
return false;
}
// functionality for exponential retry
if (mechanism.equalsIgnoreCase("exponentialretry")) {
if (executionCount < this.retryCount) {
try {
int delta = (int) ((Math.pow(2.0, executionCount) - 1.0)
* (this.deltaBackoff * NUM_0_8) + (Math.random()
* (this.deltaBackoff * NUM_1_2)
- (this.deltaBackoff * NUM_0_8) + 1));
int interval = (int) Math.min((this.minBackoff + delta), this.maxBackoff);
Thread.sleep(interval);
} catch (Exception e) {
LOG.error(e.getMessage());
}
return true;
}
return false;
}
return true;
}
}