/*
* Copyright 2016 higherfrequencytrading.com
*
* 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 net.openhft.lang.io;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class VanillaMappedBlocks implements VanillaMappedResource {
private final VanillaMappedFile mappedFile;
private final List<VanillaMappedBytes> bytes;
private final long blockSize;
private final FileLifecycleListener fileLifecycleListener;
private VanillaMappedBytes mb0;
private VanillaMappedBytes mb1;
public VanillaMappedBlocks(final File path, VanillaMappedMode mode, long blockSize, long overlapSize) throws IOException {
this(path, mode, blockSize + overlapSize, null);
}
public VanillaMappedBlocks(final File path, VanillaMappedMode mode, long blockSize,
FileLifecycleListener fileLifecycleListener) throws IOException {
this.fileLifecycleListener = fileLifecycleListener;
this.mappedFile = new VanillaMappedFile(path, mode, -1, fileLifecycleListener);
this.bytes = new ArrayList<VanillaMappedBytes>();
this.blockSize = blockSize;
this.mb0 = null;
this.mb1 = null;
}
public static VanillaMappedBlocks readWrite(final File path, long size) throws IOException {
return readWrite(path, size, FileLifecycleListener.FileLifecycleListeners.IGNORE);
}
public static VanillaMappedBlocks readOnly(final File path, long size) throws IOException {
return readOnly(path, size, FileLifecycleListener.FileLifecycleListeners.IGNORE);
}
public static VanillaMappedBlocks readWrite(final File path, long size,
FileLifecycleListener listener) throws IOException {
return new VanillaMappedBlocks(path, VanillaMappedMode.RW, size, listener);
}
public static VanillaMappedBlocks readOnly(final File path, long size,
FileLifecycleListener listener) throws IOException {
return new VanillaMappedBlocks(path, VanillaMappedMode.RO, size, listener);
}
public synchronized VanillaMappedBytes acquire(long index) throws IOException {
if (this.mb0 != null && this.mb0.index() == index) {
this.mb0.reserve();
return this.mb0;
}
if (this.mb1 != null && this.mb1.index() == index) {
this.mb1.reserve();
return this.mb1;
}
return acquire0(index);
}
protected VanillaMappedBytes acquire0(long index) throws IOException {
if (this.mb1 != null) {
this.mb1.release();
}
this.mb1 = this.mb0;
this.mb0 = this.mappedFile.bytes(index * this.blockSize, this.blockSize, index);
this.mb0.reserve();
bytes.add(this.mb0);
for (int i = bytes.size() - 1; i >= 0; i--) {
if (bytes.get(i).unmapped()) {
bytes.remove(i);
}
}
return this.mb0;
}
@Override
public String path() {
return this.mappedFile.path();
}
@Override
public synchronized long size() {
return this.mappedFile.size();
}
@Override
public synchronized void close() throws IOException {
if (this.mb0 != null && !this.mb0.unmapped()) {
this.mb0.release();
this.mb0 = null;
}
if (this.mb1 != null && !this.mb1.unmapped()) {
this.mb1.release();
this.mb1 = null;
}
for (int i = bytes.size() - 1; i >= 0; i--) {
bytes.get(i).cleanup();
}
this.bytes.clear();
this.mappedFile.close();
}
}