/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.segment.realtime;
import com.google.api.client.repackaged.com.google.common.base.Throwables;
import io.druid.segment.IncrementalIndexSegment;
import io.druid.segment.ReferenceCountingSegment;
import io.druid.segment.Segment;
import io.druid.segment.incremental.IncrementalIndex;
import java.io.IOException;
/**
*/
public class FireHydrant
{
private final int count;
private volatile IncrementalIndex index;
private volatile ReferenceCountingSegment adapter;
public FireHydrant(
IncrementalIndex index,
int count,
String segmentIdentifier
)
{
this.index = index;
this.adapter = new ReferenceCountingSegment(new IncrementalIndexSegment(index, segmentIdentifier));
this.count = count;
}
public FireHydrant(
Segment adapter,
int count
)
{
this.index = null;
this.adapter = new ReferenceCountingSegment(adapter);
this.count = count;
}
public IncrementalIndex getIndex()
{
return index;
}
public ReferenceCountingSegment getSegment()
{
return adapter;
}
public int getCount()
{
return count;
}
public boolean hasSwapped()
{
return index == null;
}
public void swapSegment(Segment adapter)
{
if (this.adapter != null) {
try {
this.adapter.close();
}
catch (IOException e) {
throw Throwables.propagate(e);
}
}
this.adapter = new ReferenceCountingSegment(adapter);
this.index = null;
}
@Override
public String toString()
{
return "FireHydrant{" +
"index=" + index +
", queryable=" + adapter +
", count=" + count +
'}';
}
}