org.apache.james.mailrepository.jdbc.MessageInputStream Maven / Gradle / Ivy
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package org.apache.james.mailrepository.jdbc;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import org.apache.james.repository.api.StreamRepository;
import org.apache.james.server.core.MimeMessageUtil;
import org.apache.james.server.core.MimeMessageWrapper;
import org.apache.mailet.Mail;
/**
* This class provides an inputStream for a Mail object.
* If the Mail is larger than 4KB it uses Piped streams and a worker thread,
* otherwise it simply creates a temporary byte buffer and does not create the
* worker thread.
*
* Note: Javamail (or the Activation Framework) already uses a
* worker thread when asked for an inputstream.
* @Deprecated Will be dropped in 3.9.0. See https://www.mail-archive.com/[email protected]/msg72460.html
*/
@Deprecated
final class MessageInputStream extends InputStream {
/**
* The size of the current message
*/
private long size = -1;
/**
* The wrapped stream (Piped or Binary)
*/
private InputStream wrapped;
/**
* If an excaption happens in the worker threads it's stored here
*/
private Exception caughtException;
/**
* Stream repository used for dbfiles (null otherwise)
*/
private final StreamRepository streamRep;
/**
* Main constructor. If srep is not null than we are using dbfiles and we
* stream the body to file and only the header to db.
*
* @param mc
* the Mail
* @param srep
* the StreamRepository the StreamRepository used for dbfiles.
* @param sizeLimit
* the sizeLimit which set the limit after which the streaming
* will be disabled
* @throws IOException
* get thrown if an IO error detected
* @throws MessagingException
* get thrown if an error detected while reading information of
* the mail
*/
public MessageInputStream(Mail mc, StreamRepository srep, int sizeLimit, final boolean update) throws IOException, MessagingException {
super();
caughtException = null;
streamRep = srep;
size = mc.getMessageSize();
// we use the pipes only when streamRep is null and the message size is
// greater than 4096
// Otherwise we should calculate the header size and not the message
// size when streamRep is not null (JAMES-475)
if (streamRep == null && size > sizeLimit) {
PipedOutputStream headerOut = new PipedOutputStream();
new Thread() {
private Mail mail;
private PipedOutputStream out;
@Override
public void run() {
try {
writeStream(mail, out, update);
} catch (IOException | MessagingException e) {
caughtException = e;
}
}
public Thread setParam(Mail mc, PipedOutputStream headerOut) {
this.mail = mc;
this.out = headerOut;
return this;
}
}.setParam(mc, (PipedOutputStream) headerOut).start();
wrapped = new PipedInputStream(headerOut);
} else {
ByteArrayOutputStream headerOut = new ByteArrayOutputStream();
writeStream(mc, headerOut, update);
wrapped = new ByteArrayInputStream(headerOut.toByteArray());
size = headerOut.size();
}
}
/**
* Returns the size of the full message
*
* @return size the full message size
*/
public long getSize() {
return size;
}
/**
* Write the full mail to the stream This can be used by this object or by
* the worker threads.
*
* @param mail
* the Mail used as source
* @param out
* the OutputStream writting the mail to
* @throws IOException
* get thrown if an IO error detected
* @throws MessagingException
* get thrown if an error detected while reading information of
* the mail
*/
private void writeStream(Mail mail, OutputStream out, boolean update) throws IOException, MessagingException {
MimeMessage msg = mail.getMessage();
if (update && msg instanceof MimeMessageWrapper) {
MimeMessageWrapper wrapper = (MimeMessageWrapper) msg;
wrapper.loadMessage();
}
OutputStream bodyOut = null;
try {
if (streamRep == null) {
// If there is no filestore, use the byte array to store headers
// and the body
bodyOut = out;
} else {
// Store the body in the stream repository
bodyOut = streamRep.put(mail.getName());
}
if (msg instanceof MimeMessageWrapper) {
((MimeMessageWrapper) msg).writeTo(out, bodyOut, null, true);
} else {
// Write the message to the headerOut and bodyOut. bodyOut goes
// straight to the file
MimeMessageUtil.writeTo(mail.getMessage(), out, bodyOut);
}
out.flush();
bodyOut.flush();
} finally {
closeOutputStreams(out, bodyOut);
}
}
private void throwException() throws IOException {
try {
if (wrapped == null) {
throw new IOException("wrapped stream does not exists anymore");
} else if (caughtException instanceof IOException) {
throw (IOException) caughtException;
} else {
throw new IOException("Exception caugth in worker thread " + caughtException.getMessage()) {
@Override
public Throwable getCause() {
return caughtException;
}
};
}
} finally {
caughtException = null;
wrapped = null;
}
}
/**
* Closes output streams used to update message
*
* @param headerStream
* the stream containing header information - potentially the
* same as the body stream
* @param bodyStream
* the stream containing body information
* @throws IOException
*/
private void closeOutputStreams(OutputStream headerStream, OutputStream bodyStream) throws IOException {
try {
// If the header stream is not the same as the body stream,
// close the header stream here.
if ((headerStream != null) && (headerStream != bodyStream)) {
headerStream.close();
}
} finally {
if (bodyStream != null) {
bodyStream.close();
}
}
}
// wrapper methods
@Override
public int available() throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
return wrapped.available();
}
@Override
public void close() throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
wrapped.close();
wrapped = null;
}
@Override
public synchronized void mark(int readLimit) {
wrapped.mark(readLimit);
}
@Override
public boolean markSupported() {
return wrapped.markSupported();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
return wrapped.read(b, off, len);
}
@Override
public int read(byte[] b) throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
return wrapped.read(b);
}
@Override
public synchronized void reset() throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
wrapped.reset();
}
@Override
public long skip(long n) throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
return wrapped.skip(n);
}
@Override
public int read() throws IOException {
if (caughtException != null || wrapped == null) {
throwException();
}
return wrapped.read();
}
}
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