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SQL bindings for the FROST-Server.
/*
* Copyright (C) 2016 Fraunhofer Institut IOSB, Fraunhoferstr. 1, D 76131
* Karlsruhe, Germany.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see sqlQuery;
private final CustomLinksHelper customLinksHelper;
private final DataSize dataSize;
private final int estimateTreshold;
private final CountMode countMode;
private Object resultObject;
/**
* If resultObject is a property or sub-property, and we are not using
* $value, then the resultObject is encapsulated in a Map, using this key.
*/
private String entityName;
/**
*
* @param pm The persistence manager.
* @param path The path leading to the items.
* @param query The query parameters to use when fetching expanded items.
* @param sqlQueryBuilder The configured sql query builder to use for
* @param dataSize The DataSize instance to add size information to.
* generating select and count queries.
*/
public ResultBuilder(PostgresPersistenceManager pm, ResourcePath path, Query query, QueryBuilder sqlQueryBuilder, DataSize dataSize) {
this.pm = pm;
this.path = path;
this.staQuery = query;
this.sqlQueryBuilder = sqlQueryBuilder;
this.sqlQuery = sqlQueryBuilder.buildSelect();
this.dataSize = dataSize;
final CoreSettings coreSettings = pm.getCoreSettings();
this.persistenceSettings = coreSettings.getPersistenceSettings();
this.customLinksHelper = coreSettings.getCustomLinksHelper();
countMode = persistenceSettings.getCountMode();
estimateTreshold = persistenceSettings.getEstimateCountThreshold();
}
public Object getEntity() {
return resultObject;
}
/**
* If resultObject is a property or sub-property, and we are not using
* $value, then the resultObject is encapsulated in a Map, using this key.
*
* @return The entityName of the resultObject in the map.
*/
public String getEntityName() {
return entityName;
}
public Query getStaQuery() {
return staQuery;
}
public ResourcePath getPath() {
return path;
}
public DataSize getDataSize() {
return dataSize;
}
@Override
public void visit(PathElementEntity element) {
Result results = sqlQuery.fetch();
if (results.size() > 1) {
throw new IllegalStateException("Expecting an element, yet more than 1 result. Got " + results.size() + " results.");
}
if (results.isEmpty()) {
return;
}
QueryState queryState = sqlQueryBuilder.getQueryState();
Entity entity = queryState.entityFromQuery(results.get(0), new DataSize(pm.getCoreSettings().getDataSizeMax()));
if (entity == null) {
throw new IllegalStateException("Failed to create an entity from result set.");
}
entity.setQuery(staQuery);
expandEntity(entity, staQuery);
resultObject = entity;
}
public void expandEntity(Entity entity, Query query) {
if (query == null) {
return;
}
if (query.getMetadata() == Metadata.FULL) {
customLinksHelper.expandCustomLinks(query, entity, path);
}
for (Expand expand : query.getExpand()) {
addExpandToEntity(entity, expand);
}
}
private void addExpandToEntity(Entity entity, Expand expand) {
NavigationProperty firstNp = expand.getPath();
NavigableElement existing = null;
Object o = entity.getProperty(firstNp);
if (o instanceof NavigableElement) {
existing = (NavigableElement) o;
} else if (firstNp instanceof NavigationPropertyCustom) {
NavigationPropertyCustom firstNpCust = (NavigationPropertyCustom) firstNp;
Object id = firstNpCust.getTargetIdFrom(entity);
if (id == null) {
return;
}
existing = loadEntity(firstNp.getEntityType(), id, expand);
if (existing == null) {
return;
}
firstNpCust.setElementOn(entity, existing);
}
Query subQuery = expand.getSubQuery();
if (existing == null || existing.isEmpty()) {
createExpandedElement(entity, firstNp, subQuery);
} else if (existing instanceof EntitySet) {
expandEntitySet((EntitySet) existing, subQuery);
} else if (existing instanceof Entity) {
expandEntity((Entity) existing, subQuery);
}
}
private Entity loadEntity(EntityType type, Object id, Expand expand) {
try {
return pm.get(type, ParserUtils.idFromObject(id), expand.getSubQuery());
} catch (IllegalArgumentException ex) {
// not a valid id.
}
return null;
}
private void createExpandedElement(Entity entity, NavigationProperty firstNp, Query subQuery) {
PathElement parentCollection = new PathElementEntitySet(entity.getEntityType());
PathElement parent = new PathElementEntity(entity.getId(), entity.getEntityType(), parentCollection);
ResourcePath ePath = new ResourcePath(path.getServiceRootUrl(), path.getVersion(), null);
ePath.addPathElement(parentCollection, false, false);
ePath.addPathElement(parent, false, true);
if (firstNp.isEntitySet()) {
PathElementEntitySet childPe = new PathElementEntitySet((NavigationPropertyEntitySet) firstNp, parent);
ePath.addPathElement(childPe, true, false);
} else {
PathElementEntity childPe;
if (firstNp instanceof NavigationPropertyEntity) {
childPe = new PathElementEntity((NavigationPropertyEntity) firstNp, parent);
} else {
childPe = new PathElementEntity(firstNp.getEntityType(), parent);
}
ePath.addPathElement(childPe, true, false);
}
Object child = pm.get(ePath, subQuery);
entity.setProperty(firstNp, child);
}
private void expandEntitySet(EntitySet entitySet, Query subQuery) {
for (Entity subEntity : entitySet) {
expandEntity(subEntity, subQuery);
}
}
private Cursor timeQuery(ResultQuery query) {
if (persistenceSettings.isTimeoutQueries()) {
query.queryTimeout(persistenceSettings.getQueryTimeout());
}
if (!persistenceSettings.isLogSlowQueries()) {
return query.fetchLazy();
}
long start = System.currentTimeMillis();
Cursor result;
try {
result = query.fetchLazy();
} catch (DataAccessException exc) {
if (LOGGER.isWarnEnabled()) {
LOGGER.info("Failed to run query:\n{}", query.getSQL(ParamType.INLINED));
}
throw new IllegalStateException("Failed to run query: " + exc.getMessage());
}
long end = System.currentTimeMillis();
long duration = end - start;
if (LOGGER.isInfoEnabled() && duration > persistenceSettings.getSlowQueryThreshold()) {
LOGGER.info("Slow Query executed in {} ms:\n{}", duration, query.getSQL(ParamType.INLINED));
}
return result;
}
private int timeCountQueryRecord(ResultQuery query) {
try ( Cursor countCursor = timeQuery(query)) {
return countCursor
.fetchNext()
.get(0, Integer.class);
}
}
private int timeCountQuery(ResultQuery> query) {
try ( Cursor> countCursor = timeQuery(query)) {
return countCursor
.fetchNext()
.component1();
}
}
@Override
public void visit(PathElementEntitySet element) {
final EntitySet entitySet;
if (staQuery.getTopOrDefault() > 0) {
final Cursor results = timeQuery(sqlQuery);
entitySet = sqlQueryBuilder
.getQueryState()
.createSetFromRecords(results, this);
} else {
entitySet = new EntitySetImpl(sqlQueryBuilder.getQueryState().getMainTable().getEntityType());
}
if (entitySet == null) {
throw new IllegalStateException("Empty set!");
}
fetchAndAddCount(entitySet);
resultObject = entitySet;
}
private void fetchAndAddCount(EntitySet entitySet) {
if (LOGGER.isTraceEnabled()) {
final int estimate = timeCountQuery(sqlQueryBuilder.buildEstimateCountExplain());
final int sample = timeCountQueryRecord(sqlQueryBuilder.buildEstimateCountSample().countQuery) * 100;
final int limit = timeCountQuery(sqlQueryBuilder.buildCount(estimateTreshold));
final int full = timeCountQuery(sqlQueryBuilder.buildCount());
LOGGER.trace("Estimate: {}, Sample: {}, Limit: {}, Full: {}", estimate, sample, limit, full);
}
if (staQuery.isCountOrDefault()) {
switch (countMode) {
case FULL:
entitySet.setCount(timeCountQuery(sqlQueryBuilder.buildCount()));
return;
case LIMIT_ESTIMATE:
countLimitEstimate(entitySet);
return;
case ESTIMATE_LIMIT:
countEstimateLimit(entitySet);
return;
case LIMIT_SAMPLE:
countLimitSample(entitySet);
return;
case SAMPLE_LIMIT:
countSampleLimit(entitySet);
return;
default:
throw new AssertionError(countMode.name());
}
}
}
public void countSampleLimit(EntitySet entitySet) {
final var csr = sqlQueryBuilder.buildEstimateCountSample();
final int estimate = (int) (timeCountQueryRecord(csr.countQuery) * Math.pow(100, csr.sampledTables));
if (estimate < estimateTreshold) {
final int count = timeCountQuery(sqlQueryBuilder.buildCount());
entitySet.setCount(count);
LOGGER.debug("Estimate: {}, Count: {}", estimate, count);
} else {
entitySet.setCount(estimate);
}
}
public void countLimitSample(EntitySet entitySet) {
final int count = timeCountQuery(sqlQueryBuilder.buildCount(estimateTreshold));
if (count < estimateTreshold) {
entitySet.setCount(count);
} else {
final var csr = sqlQueryBuilder.buildEstimateCountSample();
final int estimate = (int) (timeCountQueryRecord(csr.countQuery) * Math.pow(100, csr.sampledTables));
entitySet.setCount(Math.max(count, estimate));
LOGGER.debug("Estimate: {}, Count: {}", estimate, count);
}
}
public void countEstimateLimit(EntitySet entitySet) {
final int estimate = timeCountQuery(sqlQueryBuilder.buildEstimateCountExplain());
if (estimate < estimateTreshold) {
final int count = timeCountQuery(sqlQueryBuilder.buildCount(estimateTreshold));
entitySet.setCount(count);
LOGGER.debug("Estimate: {}, Count: {}", estimate, count);
} else {
entitySet.setCount(estimate);
}
}
public void countLimitEstimate(EntitySet entitySet) {
final int count = timeCountQuery(sqlQueryBuilder.buildCount(estimateTreshold));
if (count < estimateTreshold) {
entitySet.setCount(count);
} else {
final int estimate = timeCountQuery(sqlQueryBuilder.buildEstimateCountExplain());
entitySet.setCount(Math.max(count, estimate));
LOGGER.debug("Estimate: {}, Count: {}", estimate, count);
}
}
@Override
public void visit(PathElementProperty element) {
element.getParent().visit(this);
if (Entity.class.isAssignableFrom(resultObject.getClass())) {
Object propertyValue = ((Entity) resultObject).getProperty(element.getProperty());
Map entityMap = new HashMap<>();
entityName = element.getProperty().name;
entityMap.put(entityName, propertyValue);
resultObject = entityMap;
}
}
@Override
public void visit(PathElementCustomProperty element) {
element.getParent().visit(this);
String name = element.getName();
if (resultObject instanceof Map) {
Map map = (Map) resultObject;
Object inner = map.get(entityName);
if (inner instanceof Map) {
map = (Map) inner;
if (map.containsKey(name)) {
Object propertyValue = map.get(name);
Map entityMap = new HashMap<>();
entityName = name;
entityMap.put(entityName, propertyValue);
resultObject = entityMap;
return;
}
}
}
resultObject = null;
entityName = null;
}
@Override
public void visit(PathElementArrayIndex element) {
element.getParent().visit(this);
int index = element.getIndex();
if (resultObject instanceof Map) {
Map map = (Map) resultObject;
Object inner = map.get(entityName);
Object propertyValue = null;
if (inner instanceof ArrayNode && ((ArrayNode) inner).size() > index) {
propertyValue = ((ArrayNode) inner).get(index);
}
if (inner instanceof List && ((List) inner).size() > index) {
propertyValue = ((List) inner).get(index);
}
if (propertyValue != null) {
Map entityMap = new HashMap<>();
entityName = entityName + "[" + Integer.toString(index) + "]";
entityMap.put(entityName, propertyValue);
resultObject = entityMap;
return;
}
}
resultObject = null;
entityName = null;
}
}
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