/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ignite.internal.visor.query;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import javax.cache.Cache;
import org.apache.ignite.IgniteCache;
import org.apache.ignite.cache.CachePeekMode;
import org.apache.ignite.cache.query.QueryCursor;
import org.apache.ignite.cache.query.ScanQuery;
import org.apache.ignite.internal.processors.task.GridInternal;
import org.apache.ignite.internal.util.typedef.F;
import org.apache.ignite.internal.util.typedef.internal.S;
import org.apache.ignite.internal.util.typedef.internal.U;
import org.apache.ignite.internal.visor.VisorEither;
import org.apache.ignite.internal.visor.VisorJob;
import org.apache.ignite.internal.visor.VisorOneNodeTask;
import org.apache.ignite.internal.visor.util.VisorExceptionWrapper;
import org.apache.ignite.lang.IgniteBiPredicate;
import static org.apache.ignite.internal.visor.query.VisorQueryUtils.SCAN_COL_NAMES;
import static org.apache.ignite.internal.visor.query.VisorQueryUtils.SCAN_QRY_NAME;
import static org.apache.ignite.internal.visor.query.VisorQueryUtils.fetchScanQueryRows;
import static org.apache.ignite.internal.visor.query.VisorQueryUtils.scheduleResultSetHolderRemoval;
/**
* Task for execute SCAN query and get first page of results.
*/
@GridInternal
public class VisorScanQueryTask extends VisorOneNodeTask<VisorScanQueryTaskArg, VisorEither<VisorQueryResult>> {
/** */
private static final long serialVersionUID = 0L;
/** {@inheritDoc} */
@Override protected VisorScanQueryJob job(VisorScanQueryTaskArg arg) {
return new VisorScanQueryJob(arg, debug);
}
/**
* Job for execute SCAN query and get first page of results.
*/
private static class VisorScanQueryJob extends VisorJob<VisorScanQueryTaskArg, VisorEither<VisorQueryResult>> {
/** */
private static final long serialVersionUID = 0L;
/**
* Create job with specified argument.
*
* @param arg Job argument.
* @param debug Debug flag.
*/
private VisorScanQueryJob(VisorScanQueryTaskArg arg, boolean debug) {
super(arg, debug);
}
/**
* Execute scan query.
*
* @param c Cache to scan.
* @param arg Job argument with query parameters.
* @return Query cursor.
*/
private QueryCursor<Cache.Entry<Object, Object>> scan(IgniteCache<Object, Object> c, VisorScanQueryTaskArg arg,
IgniteBiPredicate<Object, Object> filter) {
ScanQuery<Object, Object> qry = new ScanQuery<>(filter);
qry.setPageSize(arg.getPageSize());
qry.setLocal(arg.isLocal());
return c.withKeepBinary().query(qry);
}
/**
* Scan near cache.
*
* @param c Cache to scan near entries.
* @return Cache entries iterator wrapped with query cursor.
*/
private QueryCursor<Cache.Entry<Object, Object>> near(IgniteCache<Object, Object> c) {
return new VisorNearCacheCursor<>(c.localEntries(CachePeekMode.NEAR).iterator());
}
/** {@inheritDoc} */
@Override protected VisorEither<VisorQueryResult> run(final VisorScanQueryTaskArg arg) {
try {
IgniteCache<Object, Object> c = ignite.context().cache().jcache(arg.getCacheName());
UUID nid = ignite.localNode().id();
String filterText = arg.getFilter();
long start = U.currentTimeMillis();
IgniteBiPredicate<Object, Object> filter = null;
if (!F.isEmpty(filterText))
filter = new VisorQueryScanRegexFilter(arg.isCaseSensitive(), arg.isRegEx(), filterText);
VisorQueryCursor<Cache.Entry<Object, Object>> cur =
new VisorQueryCursor<>(arg.isNear() ? near(c) : scan(c, arg, filter));
List<Object[]> rows = fetchScanQueryRows(cur, arg.getPageSize());
long duration = U.currentTimeMillis() - start; // Scan duration + fetch duration.
boolean hasNext = cur.hasNext();
// Generate query ID to store query cursor in node local storage.
String qryId = SCAN_QRY_NAME + "-" + UUID.randomUUID();
if (hasNext) {
ignite.cluster().<String, VisorQueryCursor>nodeLocalMap().put(qryId, cur);
scheduleResultSetHolderRemoval(qryId, ignite);
}
else
cur.close();
return new VisorEither<>(new VisorQueryResult(nid, qryId, SCAN_COL_NAMES, rows, hasNext,
duration));
}
catch (Throwable e) {
return new VisorEither<>(new VisorExceptionWrapper(e));
}
}
/** {@inheritDoc} */
@Override public String toString() {
return S.toString(VisorScanQueryJob.class, this);
}
/**
* Wrapper for cache iterator to behave like {@link QueryCursor}.
*/
private static class VisorNearCacheCursor<T> implements QueryCursor<T> {
/** Wrapped iterator. */
private final Iterator<T> it;
/**
* Wrapping constructor.
*
* @param it Near cache iterator to wrap.
*/
private VisorNearCacheCursor(Iterator<T> it) {
this.it = it;
}
/** {@inheritDoc} */
@Override public List<T> getAll() {
List<T> all = new ArrayList<>();
while(it.hasNext())
all.add(it.next());
return all;
}
/** {@inheritDoc} */
@Override public void close() {
// Nothing to close.
}
/** {@inheritDoc} */
@Override public Iterator<T> iterator() {
return it;
}
}
}
}