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/*
* Copyright (c) 2009, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.ws.util;
import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Reads a input stream completely and creates a new stream
* by keeping some data in memory and the rest on the file system.
*
* @author Jitendra Kotamraju
*/
public class ReadAllStream extends InputStream {
private final @NotNull MemoryStream memStream;
private final @NotNull FileStream fileStream;
private boolean readAll;
private boolean closed;
private static final Logger LOGGER = Logger.getLogger(ReadAllStream.class.getName());
public ReadAllStream() {
memStream = new MemoryStream();
fileStream = new FileStream();
}
/**
* Reads the data from input stream completely. It keeps
* inMemory size in the memory, and the rest on the file
* system.
*
* Caller's responsibility to close the InputStream. This
* method can be called only once.
*
* @param in from which to be read
* @param inMemory this much data is kept in the memory
* @throws IOException in case of exception
*/
public void readAll(InputStream in, long inMemory) throws IOException {
assert !readAll;
readAll = true;
boolean eof = memStream.readAll(in, inMemory);
if (!eof) {
fileStream.readAll(in);
}
}
@Override
public int read() throws IOException {
int ch = memStream.read();
if (ch == -1) {
ch = fileStream.read();
}
return ch;
}
@Override
public int read(byte b[], int off, int sz) throws IOException {
int len = memStream.read(b, off, sz);
if (len == -1) {
len = fileStream.read(b, off, sz);
}
return len;
}
@Override
public void close() throws IOException {
if (!closed) {
memStream.close();
fileStream.close();
closed = true;
}
}
// Keeps the rest of the data on the file system
private static class FileStream extends InputStream {
private @Nullable File tempFile;
private @Nullable FileInputStream fin;
void readAll(InputStream in) throws IOException {
tempFile = File.createTempFile("jaxws",".bin");
FileOutputStream fileOut = new FileOutputStream(tempFile);
try {
byte[] buf = new byte[8192];
int len;
while((len=in.read(buf)) != -1) {
fileOut.write(buf, 0, len);
}
} finally {
fileOut.close();
}
fin = new FileInputStream(tempFile);
}
@Override
public int read() throws IOException {
return (fin != null) ? fin.read() : -1;
}
@Override
public int read(byte b[], int off, int sz) throws IOException {
return (fin != null) ? fin.read(b, off, sz) : -1;
}
@Override
public void close() throws IOException {
if (fin != null) {
fin.close();
}
if (tempFile != null) {
boolean success = tempFile.delete();
if (!success) {
LOGGER.log(Level.INFO, "File {0} could not be deleted", tempFile);
}
}
}
}
// Keeps data in memory until certain size
private static class MemoryStream extends InputStream {
private Chunk head, tail;
private int curOff;
private void add(byte[] buf, int len) {
if (tail != null) {
tail = tail.createNext(buf, 0, len);
} else {
head = tail = new Chunk(buf, 0, len);
}
}
/**
* Reads until the size specified
*
* @param in stream from which to be read
* @param inMemory reads until this size
* @return true if eof
* false otherwise
* @throws IOException in case of exception
*/
boolean readAll(InputStream in, long inMemory) throws IOException {
long total = 0;
while(true) {
byte[] buf = new byte[8192];
int read = fill(in, buf);
total += read;
if (read != 0) {
add(buf, read);
}
if (read != buf.length) {
return true;
} // EOF
if (total > inMemory) {
return false; // Reached in-memory size
}
}
}
private int fill(InputStream in, byte[] buf) throws IOException {
int read;
int total = 0;
while(total < buf.length && (read=in.read(buf, total, buf.length-total)) != -1) {
total += read;
}
return total;
}
@Override
public int read() throws IOException {
if (!fetch()) {
return -1;
}
return (head.buf[curOff++] & 0xff);
}
@Override
public int read(byte b[], int off, int sz) throws IOException {
if (!fetch()) {
return -1;
}
sz = Math.min(sz, head.len-(curOff-head.off));
System.arraycopy(head.buf,curOff,b,off,sz);
curOff += sz;
return sz;
}
// if eof, return false else true
private boolean fetch() {
if (head == null) {
return false;
}
if (curOff == head.off+head.len) {
head = head.next;
if (head == null) {
return false;
}
curOff = head.off;
}
return true;
}
private static final class Chunk {
Chunk next;
final byte[] buf;
final int off;
final int len;
public Chunk(byte[] buf, int off, int len) {
this.buf = buf;
this.off = off;
this.len = len;
}
public Chunk createNext(byte[] buf, int off, int len) {
return next = new Chunk(buf, off, len);
}
}
}
}