package org.springframework.orm.jpa.support;
import java.util.concurrent.Callable;
import javax.persistence.EntityManagerFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.orm.jpa.EntityManagerFactoryUtils;
import org.springframework.orm.jpa.EntityManagerHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.async.CallableProcessingInterceptor;
import org.springframework.web.context.request.async.DeferredResult;
import org.springframework.web.context.request.async.DeferredResultProcessingInterceptor;
class AsyncRequestInterceptor implements CallableProcessingInterceptor, DeferredResultProcessingInterceptor {
private static final Log logger = LogFactory.getLog(AsyncRequestInterceptor.class);
private final EntityManagerFactory emFactory;
private final EntityManagerHolder emHolder;
private volatile boolean timeoutInProgress;
private volatile boolean errorInProgress;
public AsyncRequestInterceptor(EntityManagerFactory emFactory, EntityManagerHolder emHolder) {
this.emFactory = emFactory;
this.emHolder = emHolder;
}
@Override
public <T> void preProcess(NativeWebRequest request, Callable<T> task) {
bindEntityManager();
}
public void bindEntityManager() {
this.timeoutInProgress = false;
this.errorInProgress = false;
TransactionSynchronizationManager.bindResource(this.emFactory, this.emHolder);
}
@Override
public <T> void postProcess(NativeWebRequest request, Callable<T> task, Object concurrentResult) {
TransactionSynchronizationManager.unbindResource(this.emFactory);
}
@Override
public <T> Object handleTimeout(NativeWebRequest request, Callable<T> task) {
this.timeoutInProgress = true;
return RESULT_NONE;
}
@Override
public <T> Object handleError(NativeWebRequest request, Callable<T> task, Throwable t) {
this.errorInProgress = true;
return RESULT_NONE;
}
@Override
public <T> void afterCompletion(NativeWebRequest request, Callable<T> task) throws Exception {
closeEntityManager();
}
private void closeEntityManager() {
if (this.timeoutInProgress || this.errorInProgress) {
logger.debug("Closing JPA EntityManager after async request timeout/error");
EntityManagerFactoryUtils.closeEntityManager(this.emHolder.getEntityManager());
}
}
@Override
public <T> boolean handleTimeout(NativeWebRequest request, DeferredResult<T> deferredResult) {
this.timeoutInProgress = true;
return true;
}
@Override
public <T> boolean handleError(NativeWebRequest request, DeferredResult<T> deferredResult, Throwable t) {
this.errorInProgress = true;
return true;
}
@Override
public <T> void afterCompletion(NativeWebRequest request, DeferredResult<T> deferredResult) {
closeEntityManager();
}
}