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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aaf
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package org.onap.aaf.authz.local;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Iterator;
import org.onap.aaf.authz.env.AuthzTrans;
import org.onap.aaf.authz.local.DataFile.Token;
import org.onap.aaf.authz.local.DataFile.Token.Field;
import org.onap.aaf.inno.env.Env;
import org.onap.aaf.inno.env.TimeTaken;
public abstract class AbsData implements Iterable<String> {
protected DataFile data;
protected TextIndex ti;
private File dataf,idxf,lockf;
private String name;
private char delim;
private int maxLineSize;
private int fieldOffset;
private int skipLines;
public AbsData(File dataf,char sepChar, int maxLineSize, int fieldOffset) {
File dir = dataf.getParentFile();
int dot = dataf.getName().lastIndexOf('.');
if(dot>=0) {
name = dataf.getName().substring(0,dot);
}
this.dataf=dataf;
this.delim = sepChar;
this.maxLineSize = maxLineSize;
this.fieldOffset = fieldOffset;
idxf = new File(dir,name.concat(".idx"));
lockf = new File(dir,name.concat(".lock"));
data = new DataFile(dataf,"r");
ti = new TextIndex(idxf);
skipLines=0;
}
public void skipLines(int lines) {
skipLines=lines;
}
public String name() {
return name;
}
public void open(AuthzTrans trans, long timeout) throws IOException {
TimeTaken tt = trans.start("Open Data File", Env.SUB);
boolean opened = false, first = true;
try {
if(!dataf.exists()) {
throw new FileNotFoundException("Data File Missing:" + dataf.getCanonicalPath());
}
long begin = System.currentTimeMillis();
long end = begin+timeout;
boolean exists;
while((exists=lockf.exists()) && begin<end) {
if(first) {
trans.warn().log("Waiting for",lockf.getCanonicalPath(),"to close");
first = false;
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
break;
}
begin = System.currentTimeMillis();
}
if(exists) {
throw new IOException(lockf.getCanonicalPath() + "exists. May not open Datafile");
}
data.open();
try {
ensureIdxGood(trans);
} catch (IOException e) {
data.close();
throw e;
}
ti.open();
opened = true;
} finally {
tt.done();
}
if(!opened) {
throw new IOException("DataFile pair for " + name + " was not able to be opened in " + timeout + "ms");
}
}
private synchronized void ensureIdxGood(AuthzTrans trans) throws IOException {
if(!idxf.exists() || idxf.length()==0 || dataf.lastModified()>idxf.lastModified()) {
trans.warn().log(idxf.getCanonicalPath(),"is missing, empty or out of date, creating");
RandomAccessFile raf = new RandomAccessFile(lockf, "rw");
try {
ti.create(trans, data, maxLineSize, delim, fieldOffset, skipLines);
if(!idxf.exists() || (idxf.length()==0 && dataf.length()!=0)) {
throw new IOException("Data Index File did not create correctly");
}
} finally {
raf.close();
lockf.delete();
}
}
}
public void close(AuthzTrans trans) throws IOException {
ti.close();
data.close();
}
public class Reuse {
private Token tokenData;
private Field fieldData;
private Reuse(int size,char delim) {
tokenData = data.new Token(size);
fieldData = getTokenData().new Field(delim);
}
public void reset() {
getFieldData().reset();
}
public void pos(int rec) {
getFieldData().reset();
getTokenData().pos(rec);
}
public String next() {
return getFieldData().next();
}
public String at(int field) {
return getFieldData().at(field);
}
public String atToEnd(int field) {
return getFieldData().atToEnd(field);
}
public Field getFieldData() {
return fieldData;
}
public Token getTokenData() {
return tokenData;
}
}
public Reuse reuse() {
return new Reuse(maxLineSize,delim);
}
public Iter iterator() {
return new Iter();
}
public class Iter implements Iterator<String> {
private Reuse reuse;
private org.onap.aaf.authz.local.TextIndex.Iter tii;
public Iter() {
reuse = reuse();
tii = ti.new Iter();
}
@Override
public boolean hasNext() {
return tii.hasNext();
}
@Override
public String next() {
reuse.reset();
int rec = tii.next();
reuse.pos(rec);
return reuse.at(0);
}
@Override
public void remove() {
// read only
}
}
}
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