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org.apache.cxf.io.CachedOutputStream Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cxf.io;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.cxf.common.util.SystemPropertyAction;
import org.apache.cxf.helpers.FileUtils;
import org.apache.cxf.helpers.IOUtils;
import org.apache.cxf.helpers.LoadingByteArrayOutputStream;
public class CachedOutputStream extends OutputStream {
private static final File DEFAULT_TEMP_DIR;
private static final int DEFAULT_THRESHOLD;
private static final long DEFAULT_MAX_SIZE;
static {
String s = SystemPropertyAction.getProperty("org.apache.cxf.io.CachedOutputStream.Threshold",
"-1");
int i = Integer.parseInt(s);
if (i <= 0) {
i = 64 * 1024;
}
DEFAULT_THRESHOLD = i;
s = SystemPropertyAction.getPropertyOrNull("org.apache.cxf.io.CachedOutputStream.OutputDirectory");
if (s != null) {
File f = new File(s);
if (f.exists() && f.isDirectory()) {
DEFAULT_TEMP_DIR = f;
} else {
DEFAULT_TEMP_DIR = null;
}
} else {
DEFAULT_TEMP_DIR = null;
}
s = System.getProperty("org.apache.cxf.io.CachedOutputStream.MaxSize",
"-1");
DEFAULT_MAX_SIZE = Long.parseLong(s);
}
protected boolean outputLocked;
protected OutputStream currentStream;
private long threshold = DEFAULT_THRESHOLD;
private long maxSize = DEFAULT_MAX_SIZE;
private long totalLength;
private boolean inmem;
private boolean tempFileFailed;
private File tempFile;
private File outputDir = DEFAULT_TEMP_DIR;
private boolean allowDeleteOfFile = true;
private List callbacks;
private List streamList = new ArrayList();
public CachedOutputStream(PipedInputStream stream) throws IOException {
currentStream = new PipedOutputStream(stream);
inmem = true;
}
public CachedOutputStream() {
currentStream = new LoadingByteArrayOutputStream(2048);
inmem = true;
}
public CachedOutputStream(long threshold) {
this.threshold = threshold;
currentStream = new LoadingByteArrayOutputStream(2048);
inmem = true;
}
public void holdTempFile() {
allowDeleteOfFile = false;
}
public void releaseTempFileHold() {
allowDeleteOfFile = true;
}
public void registerCallback(CachedOutputStreamCallback cb) {
if (null == callbacks) {
callbacks = new ArrayList();
}
callbacks.add(cb);
}
public void deregisterCallback(CachedOutputStreamCallback cb) {
if (null != callbacks) {
callbacks.remove(cb);
}
}
public List getCallbacks() {
return callbacks == null ? null : Collections.unmodifiableList(callbacks);
}
/**
* Perform any actions required on stream flush (freeze headers, reset
* output stream ... etc.)
*/
protected void doFlush() throws IOException {
}
public void flush() throws IOException {
currentStream.flush();
if (null != callbacks) {
for (CachedOutputStreamCallback cb : callbacks) {
cb.onFlush(this);
}
}
doFlush();
}
/**
* Perform any actions required on stream closure (handle response etc.)
*/
protected void doClose() throws IOException {
}
/**
* Perform any actions required after stream closure (close the other related stream etc.)
*/
protected void postClose() throws IOException {
}
/**
* Locks the output stream to prevent additional writes, but maintains
* a pointer to it so an InputStream can be obtained
* @throws IOException
*/
public void lockOutputStream() throws IOException {
if (outputLocked) {
return;
}
currentStream.flush();
outputLocked = true;
if (null != callbacks) {
for (CachedOutputStreamCallback cb : callbacks) {
cb.onClose(this);
}
}
doClose();
streamList.remove(currentStream);
}
public void close() throws IOException {
currentStream.flush();
outputLocked = true;
if (null != callbacks) {
for (CachedOutputStreamCallback cb : callbacks) {
cb.onClose(this);
}
}
doClose();
currentStream.close();
maybeDeleteTempFile(currentStream);
postClose();
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof CachedOutputStream) {
return currentStream.equals(((CachedOutputStream)obj).currentStream);
}
return currentStream.equals(obj);
}
/**
* Replace the original stream with the new one, optionally copying the content of the old one
* into the new one.
* When with Attachment, needs to replace the xml writer stream with the stream used by
* AttachmentSerializer or copy the cached output stream to the "real"
* output stream, i.e. onto the wire.
*
* @param out the new output stream
* @param copyOldContent flag indicating if the old content should be copied
* @throws IOException
*/
public void resetOut(OutputStream out, boolean copyOldContent) throws IOException {
if (out == null) {
out = new ByteArrayOutputStream();
}
if (currentStream instanceof CachedOutputStream) {
CachedOutputStream ac = (CachedOutputStream) currentStream;
InputStream in = ac.getInputStream();
IOUtils.copyAndCloseInput(in, out);
} else {
if (inmem) {
if (currentStream instanceof ByteArrayOutputStream) {
ByteArrayOutputStream byteOut = (ByteArrayOutputStream) currentStream;
if (copyOldContent && byteOut.size() > 0) {
byteOut.writeTo(out);
}
} else if (currentStream instanceof PipedOutputStream) {
PipedOutputStream pipeOut = (PipedOutputStream) currentStream;
IOUtils.copyAndCloseInput(new PipedInputStream(pipeOut), out);
} else {
throw new IOException("Unknown format of currentStream");
}
} else {
// read the file
currentStream.close();
if (copyOldContent) {
FileInputStream fin = new FileInputStream(tempFile);
IOUtils.copyAndCloseInput(fin, out);
}
streamList.remove(currentStream);
tempFile.delete();
tempFile = null;
inmem = true;
}
}
currentStream = out;
outputLocked = false;
}
public static void copyStream(InputStream in, OutputStream out, int bufferSize) throws IOException {
IOUtils.copyAndCloseInput(in, out, bufferSize);
}
public long size() {
return totalLength;
}
public byte[] getBytes() throws IOException {
flush();
if (inmem) {
if (currentStream instanceof ByteArrayOutputStream) {
return ((ByteArrayOutputStream)currentStream).toByteArray();
} else {
throw new IOException("Unknown format of currentStream");
}
} else {
// read the file
FileInputStream fin = new FileInputStream(tempFile);
return IOUtils.readBytesFromStream(fin);
}
}
public void writeCacheTo(OutputStream out) throws IOException {
flush();
if (inmem) {
if (currentStream instanceof ByteArrayOutputStream) {
((ByteArrayOutputStream)currentStream).writeTo(out);
} else {
throw new IOException("Unknown format of currentStream");
}
} else {
// read the file
FileInputStream fin = new FileInputStream(tempFile);
IOUtils.copyAndCloseInput(fin, out);
}
}
public void writeCacheTo(StringBuilder out, long limit) throws IOException {
writeCacheTo(out, "UTF-8", limit);
}
public void writeCacheTo(StringBuilder out, String charsetName, long limit) throws IOException {
flush();
if (totalLength < limit
|| limit == -1) {
writeCacheTo(out);
return;
}
long count = 0;
if (inmem) {
if (currentStream instanceof ByteArrayOutputStream) {
byte bytes[] = ((ByteArrayOutputStream)currentStream).toByteArray();
out.append(IOUtils.newStringFromBytes(bytes, charsetName, 0, (int)limit));
} else {
throw new IOException("Unknown format of currentStream");
}
} else {
// read the file
FileInputStream fin = new FileInputStream(tempFile);
byte bytes[] = new byte[1024];
long x = fin.read(bytes);
while (x != -1) {
if ((count + x) > limit) {
x = limit - count;
}
out.append(IOUtils.newStringFromBytes(bytes, charsetName, 0, (int)x));
count += x;
if (count >= limit) {
x = -1;
} else {
x = fin.read(bytes);
}
}
fin.close();
}
}
public void writeCacheTo(StringBuilder out) throws IOException {
writeCacheTo(out, "UTF-8");
}
public void writeCacheTo(StringBuilder out, String charsetName) throws IOException {
flush();
if (inmem) {
if (currentStream instanceof ByteArrayOutputStream) {
byte[] bytes = ((ByteArrayOutputStream)currentStream).toByteArray();
out.append(IOUtils.newStringFromBytes(bytes, charsetName));
} else {
throw new IOException("Unknown format of currentStream");
}
} else {
// read the file
FileInputStream fin = new FileInputStream(tempFile);
byte bytes[] = new byte[1024];
int x = fin.read(bytes);
while (x != -1) {
out.append(IOUtils.newStringFromBytes(bytes, charsetName, 0, x));
x = fin.read(bytes);
}
fin.close();
}
}
/**
* @return the underlying output stream
*/
public OutputStream getOut() {
return currentStream;
}
public int hashCode() {
return currentStream.hashCode();
}
public String toString() {
StringBuilder builder = new StringBuilder().append("[")
.append(CachedOutputStream.class.getName())
.append(" Content: ");
try {
writeCacheTo(builder);
} catch (IOException e) {
//ignore
}
return builder.append("]").toString();
}
protected void onWrite() throws IOException {
}
private void enforceLimits() throws IOException {
if (maxSize > 0 && totalLength > maxSize) {
throw new CacheSizeExceededException();
}
if (inmem && totalLength > threshold && currentStream instanceof ByteArrayOutputStream) {
createFileOutputStream();
}
}
public void write(byte[] b, int off, int len) throws IOException {
if (!outputLocked) {
onWrite();
this.totalLength += len;
enforceLimits();
currentStream.write(b, off, len);
}
}
public void write(byte[] b) throws IOException {
if (!outputLocked) {
onWrite();
this.totalLength += b.length;
enforceLimits();
currentStream.write(b);
}
}
public void write(int b) throws IOException {
if (!outputLocked) {
onWrite();
this.totalLength++;
enforceLimits();
currentStream.write(b);
}
}
private void createFileOutputStream() throws IOException {
if (tempFileFailed) {
return;
}
ByteArrayOutputStream bout = (ByteArrayOutputStream)currentStream;
try {
if (outputDir == null) {
tempFile = FileUtils.createTempFile("cos", "tmp");
} else {
tempFile = FileUtils.createTempFile("cos", "tmp", outputDir, false);
}
currentStream = new BufferedOutputStream(new FileOutputStream(tempFile));
bout.writeTo(currentStream);
inmem = false;
streamList.add(currentStream);
} catch (Exception ex) {
//Could be IOException or SecurityException or other issues.
//Don't care what, just keep it in memory.
tempFileFailed = true;
tempFile = null;
inmem = true;
currentStream = bout;
}
}
public File getTempFile() {
return tempFile != null && tempFile.exists() ? tempFile : null;
}
public InputStream getInputStream() throws IOException {
flush();
if (inmem) {
if (currentStream instanceof LoadingByteArrayOutputStream) {
return ((LoadingByteArrayOutputStream) currentStream).createInputStream();
} else if (currentStream instanceof ByteArrayOutputStream) {
return new ByteArrayInputStream(((ByteArrayOutputStream) currentStream).toByteArray());
} else if (currentStream instanceof PipedOutputStream) {
return new PipedInputStream((PipedOutputStream) currentStream);
} else {
return null;
}
} else {
try {
FileInputStream fileInputStream = new FileInputStream(tempFile) {
public void close() throws IOException {
super.close();
maybeDeleteTempFile(this);
}
};
streamList.add(fileInputStream);
return fileInputStream;
} catch (FileNotFoundException e) {
throw new IOException("Cached file was deleted, " + e.toString());
}
}
}
private void maybeDeleteTempFile(Object stream) {
streamList.remove(stream);
if (!inmem && tempFile != null && streamList.isEmpty() && allowDeleteOfFile) {
if (currentStream != null) {
try {
currentStream.close();
postClose();
} catch (Exception e) {
//ignore
}
}
tempFile.delete();
tempFile = null;
currentStream = new LoadingByteArrayOutputStream(1024);
inmem = true;
}
}
public void setOutputDir(File outputDir) throws IOException {
this.outputDir = outputDir;
}
public void setThreshold(long threshold) {
this.threshold = threshold;
}
public void setMaxSize(long maxSize) {
this.maxSize = maxSize;
}
}
