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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.persistence.dummy;
import com.yahoo.collections.Pair;
import com.yahoo.document.fieldset.FieldSet;
import com.yahoo.persistence.spi.AbstractPersistenceProvider;
import com.yahoo.persistence.spi.*;
import com.yahoo.persistence.spi.conformance.ConformanceTest;
import com.yahoo.persistence.spi.result.*;
import java.util.*;
import com.yahoo.document.*;
/**
* Simple memory-based implementation of the persistence provider interface.
* Intended as an example for future implementations.
*/
public class DummyPersistenceProvider extends AbstractPersistenceProvider
{
Map<BucketId, BucketContents> bucketContents = new TreeMap<BucketId, BucketContents>();
long nextIteratorId = 1;
Map<Long, IteratorContext> iteratorContexts = new TreeMap<Long, IteratorContext>();
@Override
public synchronized Result initialize() {
bucketContents.clear();
iteratorContexts.clear();
return new Result();
}
@Override
public synchronized BucketIdListResult listBuckets(short partition) {
return new BucketIdListResult(new ArrayList<BucketId>(bucketContents.keySet()));
}
@Override
public synchronized BucketInfoResult getBucketInfo(Bucket bucket) {
BucketContents contents = bucketContents.get(bucket.getBucketId());
if (contents == null) {
return new BucketInfoResult(new BucketInfo());
}
return new BucketInfoResult(contents.getBucketInfo());
}
@Override
public synchronized Result put(Bucket bucket, long timestamp, Document doc) {
bucketContents.get(bucket.getBucketId()).put(timestamp, doc);
return new Result();
}
@Override
public synchronized RemoveResult remove(Bucket bucket, long timestamp, DocumentId id) {
return new RemoveResult(bucketContents.get(bucket.getBucketId()).remove(timestamp, id));
}
@Override
public synchronized GetResult get(Bucket bucket, FieldSet fieldSet, DocumentId id) {
BucketContents contents = bucketContents.get(bucket.getBucketId());
if (contents == null) {
return new GetResult();
}
return contents.get(id);
}
@Override
public synchronized CreateIteratorResult createIterator(Bucket bucket, FieldSet fieldSet, Selection selection, PersistenceProvider.IncludedVersions versions) {
nextIteratorId++;
List<Long> timestamps = new ArrayList<Long>();
if (selection.getTimestampSubset() == null) {
for (DocEntry e : bucketContents.get(bucket.getBucketId()).entries) {
timestamps.add(e.getTimestamp());
}
} else {
timestamps.addAll(selection.getTimestampSubset());
// Explicitly specifying a timestamp subset implies that any version may
// be returned. This is essential for merging to work correctly.
versions = IncludedVersions.ALL_VERSIONS;
}
iteratorContexts.put(nextIteratorId - 1, new IteratorContext(bucket, fieldSet, selection, timestamps, versions));
return new CreateIteratorResult(nextIteratorId - 1);
}
@Override
public synchronized IterateResult iterate(long iteratorId, long maxByteSize) {
IteratorContext context = iteratorContexts.get(iteratorId);
if (context == null) {
return new IterateResult(Result.ErrorType.PERMANENT_ERROR, "Iterator id not found");
}
ArrayList<DocEntry> entries = new ArrayList<DocEntry>();
for (DocEntry e : bucketContents.get(context.getBucket().getBucketId()).entries) {
if (maxByteSize < 0) {
return new IterateResult(entries, false);
}
if (context.getTimestamps().contains(e.getTimestamp())) {
context.getTimestamps().remove(e.getTimestamp());
} else {
continue;
}
if (e.getType() == DocEntry.Type.PUT_ENTRY) {
if (context.getSelection() != null && !context.getSelection().match(e.getDocument(), e.getTimestamp())) {
continue;
}
entries.add(e);
maxByteSize -= e.getDocument().getSerializedSize();
} else if (context.getIncludedVersions() == PersistenceProvider.IncludedVersions.NEWEST_DOCUMENT_OR_REMOVE
|| context.getIncludedVersions() == PersistenceProvider.IncludedVersions.ALL_VERSIONS)
{
if (context.getSelection() != null && !context.getSelection().match(e.getTimestamp())) {
continue;
}
entries.add(e);
maxByteSize -= e.getDocumentId().toString().length();
}
}
return new IterateResult(entries, true);
}
@Override
public synchronized Result destroyIterator(long iteratorId) {
iteratorContexts.remove(iteratorId);
return new Result();
}
@Override
public synchronized Result createBucket(Bucket bucket) {
bucketContents.put(bucket.getBucketId(), new BucketContents());
return new Result();
}
@Override
public synchronized Result deleteBucket(Bucket bucket) {
bucketContents.remove(bucket.getBucketId());
return new Result();
}
private void mergeExistingBucketContentsIntoNew(BucketContents newC, BucketContents oldC) {
if (oldC == null) {
return;
}
Set<Long> newTimestamps = new HashSet<Long>();
for (DocEntry entry : newC.entries) {
newTimestamps.add(entry.getTimestamp());
}
// Don't overwrite new entries with old ones
for (DocEntry oldEntry : oldC.entries) {
if (newTimestamps.contains(oldEntry.getTimestamp())) {
continue;
}
newC.entries.add(oldEntry);
}
}
@Override
public synchronized Result split(Bucket source, Bucket target1, Bucket target2) {
BucketContents sourceContent = bucketContents.get(source.getBucketId());
BucketContents existingTarget1 = bucketContents.get(target1.getBucketId());
BucketContents existingTarget2 = bucketContents.get(target2.getBucketId());
Pair<BucketContents, BucketContents> contents
= sourceContent.split(target1.getBucketId(), target2.getBucketId());
bucketContents.remove(source.getBucketId());
mergeExistingBucketContentsIntoNew(contents.getFirst(), existingTarget1);
mergeExistingBucketContentsIntoNew(contents.getSecond(), existingTarget2);
BucketInfo.ActiveState targetActiveState
= (sourceContent.getBucketInfo().isActive()
? BucketInfo.ActiveState.ACTIVE
: BucketInfo.ActiveState.NOT_ACTIVE);
contents.getFirst().setActiveState(targetActiveState);
contents.getSecond().setActiveState(targetActiveState);
bucketContents.put(target1.getBucketId(), contents.getFirst());
bucketContents.put(target2.getBucketId(), contents.getSecond());
return new Result();
}
@Override
public synchronized Result join(Bucket source1, Bucket source2, Bucket target) {
BucketInfo.ActiveState activeState = BucketInfo.ActiveState.NOT_ACTIVE;
BucketContents targetExisting = bucketContents.get(target.getBucketId());
BucketContents sourceExisting1 = bucketContents.get(source1.getBucketId());
BucketContents sourceExisting2 = null;
boolean singleBucketJoin = source2.getBucketId().equals(source1.getBucketId());
if (!singleBucketJoin) {
sourceExisting2 = bucketContents.get(source2.getBucketId());
}
if (sourceExisting1 != null && sourceExisting1.isActive()) {
activeState = BucketInfo.ActiveState.ACTIVE;
}
if (sourceExisting2 != null && sourceExisting2.isActive()) {
activeState = BucketInfo.ActiveState.ACTIVE;
}
BucketContents contents = new BucketContents(sourceExisting1, sourceExisting2);
bucketContents.remove(source1.getBucketId());
if (sourceExisting2 != null) {
bucketContents.remove(source2.getBucketId());
}
mergeExistingBucketContentsIntoNew(contents, targetExisting);
contents.setActiveState(activeState);
bucketContents.put(target.getBucketId(), contents);
return new Result();
}
@Override
public synchronized Result setActiveState(Bucket bucket, BucketInfo.ActiveState active) {
bucketContents.get(bucket.getBucketId()).setActiveState(active);
return new Result();
}
}
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