/*
* Licensed 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 com.facebook.presto.execution.buffer;
import io.airlift.slice.Slice;
import org.openjdk.jol.info.ClassLayout;
import static com.facebook.presto.execution.buffer.PageCompression.COMPRESSED;
import static com.facebook.presto.execution.buffer.PageCompression.UNCOMPRESSED;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public class SerializedPage
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(SerializedPage.class).instanceSize();
private static final int PAGE_COMPRESSION_SIZE = ClassLayout.parseClass(PageCompression.class).instanceSize();
private final Slice slice;
private final PageCompression compression;
private final int positionCount;
private final int uncompressedSizeInBytes;
public SerializedPage(Slice slice, PageCompression compression, int positionCount, int uncompressedSizeInBytes)
{
this.slice = requireNonNull(slice, "slice is null");
this.compression = requireNonNull(compression, "compression is null");
this.positionCount = positionCount;
checkArgument(uncompressedSizeInBytes >= 0, "uncompressedSizeInBytes is negative");
checkArgument(compression == UNCOMPRESSED || uncompressedSizeInBytes > slice.length(), "compressed size must be smaller than uncompressed size when compressed");
checkArgument(compression == COMPRESSED || uncompressedSizeInBytes == slice.length(), "uncompressed size must be equal to slice length when uncompressed");
this.uncompressedSizeInBytes = uncompressedSizeInBytes;
}
public int getSizeInBytes()
{
return slice.length();
}
public int getUncompressedSizeInBytes()
{
return uncompressedSizeInBytes;
}
public int getRetainedSizeInBytes()
{
return INSTANCE_SIZE + slice.getRetainedSize() + PAGE_COMPRESSION_SIZE;
}
public int getPositionCount()
{
return positionCount;
}
public Slice getSlice()
{
return slice;
}
public PageCompression getCompression()
{
return compression;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("positionCount", positionCount)
.add("compression", compression)
.add("sizeInBytes", slice.length())
.add("uncompressedSizeInBytes", uncompressedSizeInBytes)
.toString();
}
}