/* Copyright (c) 2001-2016, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import java.io.
IOException;
import org.hsqldb.
Database;
/**
* Mixed NIO / non-NIO version of ScaledRAFile.
* This class is used only for storing a CACHED
* TABLE .data file and cannot be used for TEXT TABLE source files.
*
* Due to various issues with java.nio classes, this class will use a mapped
* channel of fixed size. After reaching this size, the file and channel are
* closed and a new one opened, up to the maximum size.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 1.7.2
*/
public final class
RAFileHybrid implements
RandomAccessInterface {
final
Database database;
final
String fileName;
final boolean
isReadOnly;
boolean
preNio;
boolean
isNio;
long
initialMaxLength =
RAFileNIO.
largeBufferSize / 2;
RandomAccessInterface store;
public
RAFileHybrid(
Database database,
String name,
boolean
readOnly) throws
IOException {
this.
database =
database;
this.
fileName =
name;
this.
isReadOnly =
readOnly;
long
fileLength;
java.io.
File fi = new java.io.
File(
name);
fileLength =
fi.
length();
newStore(
fileLength);
}
public long
length() throws
IOException {
return
store.
length();
}
public void
seek(long
position) throws
IOException {
store.
seek(
position);
}
public long
getFilePointer() throws
IOException {
return
store.
getFilePointer();
}
public int
read() throws
IOException {
return
store.
read();
}
public void
read(byte[]
b, int
offset, int
length) throws
IOException {
store.
read(
b,
offset,
length);
}
public void
write(byte[]
b, int
offset, int
length) throws
IOException {
store.
write(
b,
offset,
length);
}
public int
readInt() throws
IOException {
return
store.
readInt();
}
public void
writeInt(int
i) throws
IOException {
store.
writeInt(
i);
}
public long
readLong() throws
IOException {
return
store.
readLong();
}
public void
writeLong(long
i) throws
IOException {
store.
writeLong(
i);
}
public void
close() throws
IOException {
store.
close();
}
public boolean
isReadOnly() {
return
store.
isReadOnly();
}
public boolean
ensureLength(long
newLength) {
if (
newLength <=
initialMaxLength) {
return
store.
ensureLength(
newLength);
} else if (
preNio) {
try {
newStore(
newLength);
} catch (
IOException e) {}
}
if (
store.
ensureLength(
newLength)) {
return true;
} else if (
isNio) {
try {
newStore(
newLength);
} catch (
IOException e) {}
}
return
store.
ensureLength(
newLength);
}
public boolean
setLength(long
newLength) {
return
store.
setLength(
newLength);
}
public
Database getDatabase() {
return null;
}
public void
synch() {
store.
synch();
}
void
newStore(long
requiredPosition) throws
IOException {
long
currentPosition = 0;
if (
store == null) {
preNio =
requiredPosition <=
database.
logger.
propNioMaxSize;
} else {
currentPosition =
store.
getFilePointer();
store.
synch();
store.
close();
}
if (
preNio &&
initialMaxLength <=
requiredPosition) {
try {
store = new
RAFileNIO(
database.
logger,
fileName,
isReadOnly,
requiredPosition,
database.
logger.
propNioMaxSize);
store.
seek(
currentPosition);
preNio = false;
isNio = true;
return;
} catch (
Throwable e) {
preNio = false;
// log event
}
}
isNio = false;
store = new
RAFile(
database.
logger,
fileName,
isReadOnly, true, false);
store.
seek(
currentPosition);
}
}