com.hazelcast.jet.sql.impl.processors.LateItemsDropP Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.processors;
import com.hazelcast.internal.metrics.Probe;
import com.hazelcast.internal.util.counters.Counter;
import com.hazelcast.internal.util.counters.SwCounter;
import com.hazelcast.jet.core.AbstractProcessor;
import com.hazelcast.jet.core.Watermark;
import com.hazelcast.jet.sql.impl.aggregate.WindowUtils;
import com.hazelcast.sql.impl.expression.Expression;
import com.hazelcast.sql.impl.expression.ExpressionEvalContext;
import com.hazelcast.sql.impl.row.JetSqlRow;
import com.hazelcast.sql.impl.row.Row;
import javax.annotation.Nonnull;
import static com.hazelcast.jet.impl.util.Util.logLateEvent;
/**
* Implementation of processor which removes late items from stream.
* While {@link LateItemsDropP#tryProcessWatermark} call captures
* the most recent watermark, {@link LateItemsDropP#tryProcess}
* filters each input item by its timestamp.
* SQL engine-specific private API.
*
* @since 5.2
*/
public class LateItemsDropP extends AbstractProcessor {
@Probe(name = "lateEventsDropped")
private final Counter lateEventsDropped = SwCounter.newSwCounter();
private final byte watermarkKey;
private final Expression> timestampExpression;
private ExpressionEvalContext evalContext;
private long currentWm = Long.MIN_VALUE;
public LateItemsDropP(byte watermarkKey, Expression> timestampExpression) {
this.watermarkKey = watermarkKey;
this.timestampExpression = timestampExpression;
}
@Override
protected void init(@Nonnull Context context) throws Exception {
this.evalContext = ExpressionEvalContext.from(context);
super.init(context);
}
@Override
protected boolean tryProcess(int ordinal, @Nonnull Object item) {
Row row = ((JetSqlRow) item).getRow();
long timestamp = WindowUtils.extractMillis(timestampExpression.eval(row, evalContext));
if (timestamp < currentWm) {
logLateEvent(getLogger(), (byte) 0, currentWm, item);
lateEventsDropped.inc();
return true;
} else {
return tryEmit(item);
}
}
@Override
public boolean tryProcessWatermark(@Nonnull Watermark watermark) {
// ignore unknown watermarks
if (watermark.key() == watermarkKey) {
currentWm = watermark.timestamp();
}
return super.tryProcessWatermark(watermark);
}
}
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