Http multithreaded connections with retry and session update
0
$begingroup$
I have the task to make a multithreaded http method. This method is my entry point (As mine is a library) for a bigger project which is a library. So the flow is like this
ProjectA ---> My Entry point Lib ----> HttpLibrary
The main features of this method are:
- Accept Multiple Requests
- Check for Http Status codes and act appropriately
- If session fails, try updating session once and retry main API call
Here is what I have come up with so far
private JsonHttpResult execJsonHttpMethod(final int requestId, BaseRequest request, int maxRequestCount) throws BaseApiException, NullPointerException {
if (maxRequestCount <= 0) {
maxRequestCount = REQUESTS_ATTEMPTS_COUNT;
}
int timeToWaitBeforeNextRequestIncaseError = 500;
HttpRetryManager httpRetryManager = new HttpRetryManager(maxRequestCount, timeToWaitBeforeNextRequestIncaseError); // Instance created for each thread
int count = 0; // Only for logging purpose - thread safe | thread local variable
JsonHttpResult result = null;
while (httpRetryManager.canRetry()) {
count++;
try {
reloginLock.readLock().lock();
final HttpMethod httpMethod = compileHttpMethod(request);
printRequestLog(request, "execJsonHttpMethod[request]: requestId=" + requestId + ", count=" + count + ", url=" + httpMethod.getURI(), false);
result = mTransportProvider.execJsonHttpMethod(httpMethod);
boolean isResEmpty = errorIfResponseEmpty(result);
if (isResEmpty) {
try {
httpRetryManager.onErrorUpdateCountAndSleep(new HttpStatusException(result.getHttpStatus(), "Unexpected empty response body"));
} catch (HttpStatusException responseEmpty) {
responseEmpty.printStackTrace();
throw responseEmpty;
}
}
boolean isSessionInvalid = errorIfResponseUnAuthorized(result);
if (isSessionInvalid) {
if (updateSessionIncaseApiGot401()) {
try {
//In-case session does not update, logout the user by escalating 401 to 403 ( InvalidSessionException() ---> InvalidUserException())
httpRetryManager.onErrorUpdateCountAndSleep(new InvalidUserException());
continue; //Start next iteration - no need to check for the rest of the conditions
} catch (InvalidUserException exceptionSessEsclatedToInvalidUser) {
exceptionSessEsclatedToInvalidUser.printStackTrace();
throw exceptionSessEsclatedToInvalidUser;
}
} else {
throw new InvalidUserException(); // WILL TRY ONLY ONCE - IF UPDATE FAILS LOGOUT - 403
}
}
//Logout user incase API threw 403 - Pops up the stack, no retry action required
if (errorIfResponseForbidden(result)) {
throw new InvalidUserException();
}
boolean isHttpErrCodeNotOk = errorIfHttpStatusNotOk(result);
if (!isHttpErrCodeNotOk) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED
&& result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
throw new HttpStatusDetailedException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString(), result.httpError);
} else {
throw new HttpStatusException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString());
}
}
}
//Success
HttpUUIDController.getInstance().handleSuccessRequest(request);
break;
} catch (TransportLevelException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, requestId=" + requestId + ", count=" + count + ", ex=" + ex, false);
try {
httpRetryManager.onErrorUpdateCountAndSleep(ex);
} catch (Exception transportException) {
transportException.printStackTrace();
throw transportException;
}
} catch (URIException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, ex=" + ex.getMessage(), false);
throw new InvalidUrlException();
} finally {
printRequestLog(request, "execJsonHttpMethod[result]: finished, requestId=" + requestId + ", count=" + count + ", result=" + result, false);
reloginLock.readLock().unlock();
}
}
simpleLog("Loop has been exited, Iterations: " + count);
return result;
}
These are my helper methods:
private boolean errorIfResponseEmpty(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_OK && result.getHttpResponse() == null) {
printResponseLog(result.getHttpStatus() + " Unexpected empty response body", true);
return true;
}
return false;
}
private boolean errorIfResponseUnAuthorized(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_UNAUTHORIZED) {
printResponseLog(result.getHttpStatus() + " Session Failed", true);
return true;
}
return false;
}
private boolean errorIfHttpStatusNotOk(HttpResult result) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED && result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString() + " " + result.httpError, true);
} else {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString(), true);
}
return false;
}
return true;
}
private boolean errorIfResponseForbidden(HttpResult result) {
return (result.getHttpStatus() == HttpStatus.SC_FORBIDDEN);
}
And finally my HttpRetryManager:
private int leftRetries;
private long timeToWait;
public HttpRetryManager(int retries, long timeToWait) {
this.timeToWait = timeToWait;
leftRetries = retries;
}
public boolean canRetry() {
return leftRetries > 0;
}
public void onErrorUpdateCountAndSleep(BaseApiException ex) throws BaseApiException {
leftRetries--;
if (!canRetry()) {
throw ex;
}
waitUntilNextTry();
}
private long getTimeToWait() {
return timeToWait;
}
private void waitUntilNextTry() {
try {
Thread.sleep(getTimeToWait());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
java multithreading error-handling api
asked 5 mins ago
User3User3
1191115
$endgroup$
add a comment |
0
$begingroup$
I have the task to make a multithreaded http method. This method is my entry point (As mine is a library) for a bigger project which is a library. So the flow is like this
ProjectA ---> My Entry point Lib ----> HttpLibrary
The main features of this method are:
- Accept Multiple Requests
- Check for Http Status codes and act appropriately
- If session fails, try updating session once and retry main API call
Here is what I have come up with so far
private JsonHttpResult execJsonHttpMethod(final int requestId, BaseRequest request, int maxRequestCount) throws BaseApiException, NullPointerException {
if (maxRequestCount <= 0) {
maxRequestCount = REQUESTS_ATTEMPTS_COUNT;
}
int timeToWaitBeforeNextRequestIncaseError = 500;
HttpRetryManager httpRetryManager = new HttpRetryManager(maxRequestCount, timeToWaitBeforeNextRequestIncaseError); // Instance created for each thread
int count = 0; // Only for logging purpose - thread safe | thread local variable
JsonHttpResult result = null;
while (httpRetryManager.canRetry()) {
count++;
try {
reloginLock.readLock().lock();
final HttpMethod httpMethod = compileHttpMethod(request);
printRequestLog(request, "execJsonHttpMethod[request]: requestId=" + requestId + ", count=" + count + ", url=" + httpMethod.getURI(), false);
result = mTransportProvider.execJsonHttpMethod(httpMethod);
boolean isResEmpty = errorIfResponseEmpty(result);
if (isResEmpty) {
try {
httpRetryManager.onErrorUpdateCountAndSleep(new HttpStatusException(result.getHttpStatus(), "Unexpected empty response body"));
} catch (HttpStatusException responseEmpty) {
responseEmpty.printStackTrace();
throw responseEmpty;
}
}
boolean isSessionInvalid = errorIfResponseUnAuthorized(result);
if (isSessionInvalid) {
if (updateSessionIncaseApiGot401()) {
try {
//In-case session does not update, logout the user by escalating 401 to 403 ( InvalidSessionException() ---> InvalidUserException())
httpRetryManager.onErrorUpdateCountAndSleep(new InvalidUserException());
continue; //Start next iteration - no need to check for the rest of the conditions
} catch (InvalidUserException exceptionSessEsclatedToInvalidUser) {
exceptionSessEsclatedToInvalidUser.printStackTrace();
throw exceptionSessEsclatedToInvalidUser;
}
} else {
throw new InvalidUserException(); // WILL TRY ONLY ONCE - IF UPDATE FAILS LOGOUT - 403
}
}
//Logout user incase API threw 403 - Pops up the stack, no retry action required
if (errorIfResponseForbidden(result)) {
throw new InvalidUserException();
}
boolean isHttpErrCodeNotOk = errorIfHttpStatusNotOk(result);
if (!isHttpErrCodeNotOk) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED
&& result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
throw new HttpStatusDetailedException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString(), result.httpError);
} else {
throw new HttpStatusException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString());
}
}
}
//Success
HttpUUIDController.getInstance().handleSuccessRequest(request);
break;
} catch (TransportLevelException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, requestId=" + requestId + ", count=" + count + ", ex=" + ex, false);
try {
httpRetryManager.onErrorUpdateCountAndSleep(ex);
} catch (Exception transportException) {
transportException.printStackTrace();
throw transportException;
}
} catch (URIException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, ex=" + ex.getMessage(), false);
throw new InvalidUrlException();
} finally {
printRequestLog(request, "execJsonHttpMethod[result]: finished, requestId=" + requestId + ", count=" + count + ", result=" + result, false);
reloginLock.readLock().unlock();
}
}
simpleLog("Loop has been exited, Iterations: " + count);
return result;
}
These are my helper methods:
private boolean errorIfResponseEmpty(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_OK && result.getHttpResponse() == null) {
printResponseLog(result.getHttpStatus() + " Unexpected empty response body", true);
return true;
}
return false;
}
private boolean errorIfResponseUnAuthorized(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_UNAUTHORIZED) {
printResponseLog(result.getHttpStatus() + " Session Failed", true);
return true;
}
return false;
}
private boolean errorIfHttpStatusNotOk(HttpResult result) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED && result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString() + " " + result.httpError, true);
} else {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString(), true);
}
return false;
}
return true;
}
private boolean errorIfResponseForbidden(HttpResult result) {
return (result.getHttpStatus() == HttpStatus.SC_FORBIDDEN);
}
And finally my HttpRetryManager:
private int leftRetries;
private long timeToWait;
public HttpRetryManager(int retries, long timeToWait) {
this.timeToWait = timeToWait;
leftRetries = retries;
}
public boolean canRetry() {
return leftRetries > 0;
}
public void onErrorUpdateCountAndSleep(BaseApiException ex) throws BaseApiException {
leftRetries--;
if (!canRetry()) {
throw ex;
}
waitUntilNextTry();
}
private long getTimeToWait() {
return timeToWait;
}
private void waitUntilNextTry() {
try {
Thread.sleep(getTimeToWait());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
java multithreading error-handling api
asked 5 mins ago
User3User3
1191115
$endgroup$
add a comment |
0
0
0
$begingroup$
I have the task to make a multithreaded http method. This method is my entry point (As mine is a library) for a bigger project which is a library. So the flow is like this
ProjectA ---> My Entry point Lib ----> HttpLibrary
The main features of this method are:
- Accept Multiple Requests
- Check for Http Status codes and act appropriately
- If session fails, try updating session once and retry main API call
Here is what I have come up with so far
private JsonHttpResult execJsonHttpMethod(final int requestId, BaseRequest request, int maxRequestCount) throws BaseApiException, NullPointerException {
if (maxRequestCount <= 0) {
maxRequestCount = REQUESTS_ATTEMPTS_COUNT;
}
int timeToWaitBeforeNextRequestIncaseError = 500;
HttpRetryManager httpRetryManager = new HttpRetryManager(maxRequestCount, timeToWaitBeforeNextRequestIncaseError); // Instance created for each thread
int count = 0; // Only for logging purpose - thread safe | thread local variable
JsonHttpResult result = null;
while (httpRetryManager.canRetry()) {
count++;
try {
reloginLock.readLock().lock();
final HttpMethod httpMethod = compileHttpMethod(request);
printRequestLog(request, "execJsonHttpMethod[request]: requestId=" + requestId + ", count=" + count + ", url=" + httpMethod.getURI(), false);
result = mTransportProvider.execJsonHttpMethod(httpMethod);
boolean isResEmpty = errorIfResponseEmpty(result);
if (isResEmpty) {
try {
httpRetryManager.onErrorUpdateCountAndSleep(new HttpStatusException(result.getHttpStatus(), "Unexpected empty response body"));
} catch (HttpStatusException responseEmpty) {
responseEmpty.printStackTrace();
throw responseEmpty;
}
}
boolean isSessionInvalid = errorIfResponseUnAuthorized(result);
if (isSessionInvalid) {
if (updateSessionIncaseApiGot401()) {
try {
//In-case session does not update, logout the user by escalating 401 to 403 ( InvalidSessionException() ---> InvalidUserException())
httpRetryManager.onErrorUpdateCountAndSleep(new InvalidUserException());
continue; //Start next iteration - no need to check for the rest of the conditions
} catch (InvalidUserException exceptionSessEsclatedToInvalidUser) {
exceptionSessEsclatedToInvalidUser.printStackTrace();
throw exceptionSessEsclatedToInvalidUser;
}
} else {
throw new InvalidUserException(); // WILL TRY ONLY ONCE - IF UPDATE FAILS LOGOUT - 403
}
}
//Logout user incase API threw 403 - Pops up the stack, no retry action required
if (errorIfResponseForbidden(result)) {
throw new InvalidUserException();
}
boolean isHttpErrCodeNotOk = errorIfHttpStatusNotOk(result);
if (!isHttpErrCodeNotOk) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED
&& result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
throw new HttpStatusDetailedException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString(), result.httpError);
} else {
throw new HttpStatusException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString());
}
}
}
//Success
HttpUUIDController.getInstance().handleSuccessRequest(request);
break;
} catch (TransportLevelException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, requestId=" + requestId + ", count=" + count + ", ex=" + ex, false);
try {
httpRetryManager.onErrorUpdateCountAndSleep(ex);
} catch (Exception transportException) {
transportException.printStackTrace();
throw transportException;
}
} catch (URIException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, ex=" + ex.getMessage(), false);
throw new InvalidUrlException();
} finally {
printRequestLog(request, "execJsonHttpMethod[result]: finished, requestId=" + requestId + ", count=" + count + ", result=" + result, false);
reloginLock.readLock().unlock();
}
}
simpleLog("Loop has been exited, Iterations: " + count);
return result;
}
These are my helper methods:
private boolean errorIfResponseEmpty(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_OK && result.getHttpResponse() == null) {
printResponseLog(result.getHttpStatus() + " Unexpected empty response body", true);
return true;
}
return false;
}
private boolean errorIfResponseUnAuthorized(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_UNAUTHORIZED) {
printResponseLog(result.getHttpStatus() + " Session Failed", true);
return true;
}
return false;
}
private boolean errorIfHttpStatusNotOk(HttpResult result) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED && result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString() + " " + result.httpError, true);
} else {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString(), true);
}
return false;
}
return true;
}
private boolean errorIfResponseForbidden(HttpResult result) {
return (result.getHttpStatus() == HttpStatus.SC_FORBIDDEN);
}
And finally my HttpRetryManager:
private int leftRetries;
private long timeToWait;
public HttpRetryManager(int retries, long timeToWait) {
this.timeToWait = timeToWait;
leftRetries = retries;
}
public boolean canRetry() {
return leftRetries > 0;
}
public void onErrorUpdateCountAndSleep(BaseApiException ex) throws BaseApiException {
leftRetries--;
if (!canRetry()) {
throw ex;
}
waitUntilNextTry();
}
private long getTimeToWait() {
return timeToWait;
}
private void waitUntilNextTry() {
try {
Thread.sleep(getTimeToWait());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
java multithreading error-handling api
asked 5 mins ago
User3User3
1191115
$endgroup$
I have the task to make a multithreaded http method. This method is my entry point (As mine is a library) for a bigger project which is a library. So the flow is like this
ProjectA ---> My Entry point Lib ----> HttpLibrary
The main features of this method are:
- Accept Multiple Requests
- Check for Http Status codes and act appropriately
- If session fails, try updating session once and retry main API call
Here is what I have come up with so far
private JsonHttpResult execJsonHttpMethod(final int requestId, BaseRequest request, int maxRequestCount) throws BaseApiException, NullPointerException {
if (maxRequestCount <= 0) {
maxRequestCount = REQUESTS_ATTEMPTS_COUNT;
}
int timeToWaitBeforeNextRequestIncaseError = 500;
HttpRetryManager httpRetryManager = new HttpRetryManager(maxRequestCount, timeToWaitBeforeNextRequestIncaseError); // Instance created for each thread
int count = 0; // Only for logging purpose - thread safe | thread local variable
JsonHttpResult result = null;
while (httpRetryManager.canRetry()) {
count++;
try {
reloginLock.readLock().lock();
final HttpMethod httpMethod = compileHttpMethod(request);
printRequestLog(request, "execJsonHttpMethod[request]: requestId=" + requestId + ", count=" + count + ", url=" + httpMethod.getURI(), false);
result = mTransportProvider.execJsonHttpMethod(httpMethod);
boolean isResEmpty = errorIfResponseEmpty(result);
if (isResEmpty) {
try {
httpRetryManager.onErrorUpdateCountAndSleep(new HttpStatusException(result.getHttpStatus(), "Unexpected empty response body"));
} catch (HttpStatusException responseEmpty) {
responseEmpty.printStackTrace();
throw responseEmpty;
}
}
boolean isSessionInvalid = errorIfResponseUnAuthorized(result);
if (isSessionInvalid) {
if (updateSessionIncaseApiGot401()) {
try {
//In-case session does not update, logout the user by escalating 401 to 403 ( InvalidSessionException() ---> InvalidUserException())
httpRetryManager.onErrorUpdateCountAndSleep(new InvalidUserException());
continue; //Start next iteration - no need to check for the rest of the conditions
} catch (InvalidUserException exceptionSessEsclatedToInvalidUser) {
exceptionSessEsclatedToInvalidUser.printStackTrace();
throw exceptionSessEsclatedToInvalidUser;
}
} else {
throw new InvalidUserException(); // WILL TRY ONLY ONCE - IF UPDATE FAILS LOGOUT - 403
}
}
//Logout user incase API threw 403 - Pops up the stack, no retry action required
if (errorIfResponseForbidden(result)) {
throw new InvalidUserException();
}
boolean isHttpErrCodeNotOk = errorIfHttpStatusNotOk(result);
if (!isHttpErrCodeNotOk) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED
&& result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
throw new HttpStatusDetailedException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString(), result.httpError);
} else {
throw new HttpStatusException(result.getHttpStatus(), "Unexpected HTTP(S) result: " + result.toString());
}
}
}
//Success
HttpUUIDController.getInstance().handleSuccessRequest(request);
break;
} catch (TransportLevelException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, requestId=" + requestId + ", count=" + count + ", ex=" + ex, false);
try {
httpRetryManager.onErrorUpdateCountAndSleep(ex);
} catch (Exception transportException) {
transportException.printStackTrace();
throw transportException;
}
} catch (URIException ex) {
printRequestLog(request, "execJsonHttpMethod[error]: request failed, ex=" + ex.getMessage(), false);
throw new InvalidUrlException();
} finally {
printRequestLog(request, "execJsonHttpMethod[result]: finished, requestId=" + requestId + ", count=" + count + ", result=" + result, false);
reloginLock.readLock().unlock();
}
}
simpleLog("Loop has been exited, Iterations: " + count);
return result;
}
These are my helper methods:
private boolean errorIfResponseEmpty(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_OK && result.getHttpResponse() == null) {
printResponseLog(result.getHttpStatus() + " Unexpected empty response body", true);
return true;
}
return false;
}
private boolean errorIfResponseUnAuthorized(HttpResult result) {
if (result.getHttpStatus() == HttpStatus.SC_UNAUTHORIZED) {
printResponseLog(result.getHttpStatus() + " Session Failed", true);
return true;
}
return false;
}
private boolean errorIfHttpStatusNotOk(HttpResult result) {
if (result.getHttpStatus() != HttpStatus.SC_OK && result.getHttpStatus() != HttpStatus.SC_CREATED && result.getHttpStatus() != HttpStatus.SC_NO_CONTENT) {
if (result.httpError != null) {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString() + " " + result.httpError, true);
} else {
printResponseLog(result.getHttpStatus() + " Unexpected HTTP(S) result: " + result.toString(), true);
}
return false;
}
return true;
}
private boolean errorIfResponseForbidden(HttpResult result) {
return (result.getHttpStatus() == HttpStatus.SC_FORBIDDEN);
}
And finally my HttpRetryManager:
private int leftRetries;
private long timeToWait;
public HttpRetryManager(int retries, long timeToWait) {
this.timeToWait = timeToWait;
leftRetries = retries;
}
public boolean canRetry() {
return leftRetries > 0;
}
public void onErrorUpdateCountAndSleep(BaseApiException ex) throws BaseApiException {
leftRetries--;
if (!canRetry()) {
throw ex;
}
waitUntilNextTry();
}
private long getTimeToWait() {
return timeToWait;
}
private void waitUntilNextTry() {
try {
Thread.sleep(getTimeToWait());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
java multithreading error-handling api
java multithreading error-handling api
asked 5 mins ago
User3User3
1191115
asked 5 mins ago
User3User3
1191115
asked 5 mins ago
User3User3
1191115
asked 5 mins ago
User3User3
1191115
asked 5 mins ago
User3User3
1191115
1191115
add a comment |
add a comment |
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