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Fix enabler for ALF-1990: BatchProcessWorkProvider calls are made in new, read-only transactions

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- Allows work provider to have visibility of changes made by worker threads
 - Prevents large queries from being held by the controlling transaction


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@23266 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Derek Hulley
2010-10-26 08:06:55 +00:00
parent a23f30a7f7
commit 7ac35ae7fd
1 changed files with 25 additions and 7 deletions
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32
source/java/org/alfresco/repo/batch/BatchProcessor.java
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@@ -275,7 +275,7 @@ public class BatchProcessor<T> implements BatchMonitor
*/
public synchronized String getPercentComplete()
{
int totalResults = this.workProvider.getTotalEstimatedWorkSize();
int totalResults = getTotalResults();
int processed = this.successfullyProcessedEntries + this.totalErrors;
return processed <= totalResults ? NumberFormat.getPercentInstance().format(
totalResults == 0 ? 1.0F : (float) processed / totalResults) : "Unknown";
@@ -294,7 +294,15 @@ public class BatchProcessor<T> implements BatchMonitor
*/
public int getTotalResults()
{
return this.workProvider.getTotalEstimatedWorkSize();
RetryingTransactionCallback<Integer> callback = new RetryingTransactionCallback<Integer>()
{
@Override
public Integer execute() throws Throwable
{
return workProvider.getTotalEstimatedWorkSize();
}
};
return retryingTransactionHelper.doInTransaction(callback, true, true);
}
/**
@@ -330,7 +338,7 @@ public class BatchProcessor<T> implements BatchMonitor
@SuppressWarnings("serial")
public int process(final BatchProcessWorker<T> worker, final boolean splitTxns)
{
int count = workProvider.getTotalEstimatedWorkSize();
int count = getTotalResults();
synchronized (this)
{
this.startTime = new Date();
@@ -373,7 +381,7 @@ public class BatchProcessor<T> implements BatchMonitor
threadFactory) : null;
try
{
Iterator<T> iterator = new WorkProviderIterator<T>(this.workProvider);
Iterator<T> iterator = new WorkProviderIterator<T>(workProvider, retryingTransactionHelper);
List<T> batch = new ArrayList<T>(this.batchSize);
while (iterator.hasNext())
{
@@ -453,7 +461,7 @@ public class BatchProcessor<T> implements BatchMonitor
{
StringBuilder message = new StringBuilder(100).append(getProcessName()).append(": Processed ").append(
processed).append(" entries");
int totalResults = this.workProvider.getTotalEstimatedWorkSize();
int totalResults = getTotalResults();
if (totalResults >= processed)
{
message.append(" out of ").append(totalResults).append(". ").append(
@@ -543,11 +551,13 @@ public class BatchProcessor<T> implements BatchMonitor
private static class WorkProviderIterator<T> implements Iterator<T>
{
private BatchProcessWorkProvider<T> workProvider;
private final RetryingTransactionHelper txnHelper;
private Iterator<T> currentIterator;
private WorkProviderIterator(BatchProcessWorkProvider<T> workProvider)
private WorkProviderIterator(BatchProcessWorkProvider<T> workProvider, RetryingTransactionHelper txnHelper)
{
this.workProvider = workProvider;
this.txnHelper = txnHelper;
}
public boolean hasNext()
@@ -570,7 +580,15 @@ public class BatchProcessor<T> implements BatchMonitor
// go and get more results
if (!hasNext)
{
Collection<T> nextWork = workProvider.getNextWork();
RetryingTransactionCallback<Collection<T>> callback = new RetryingTransactionCallback<Collection<T>>()
{
@Override
public Collection<T> execute() throws Throwable
{
return workProvider.getNextWork();
}
};
Collection<T> nextWork = txnHelper.doInTransaction(callback, true, true);
if (nextWork == null)
{
throw new RuntimeException("BatchProcessWorkProvider returned 'null' work: " + workProvider);