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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012-2014 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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*/
// Portions Copyright [2018] Payara Foundation and/or affiliates
package com.sun.enterprise.admin.remote.sse;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
/**
* @author Pavel Bucek (pavel.bucek at oracle.com), Martin Mares (martin.mares at oracle.com)
*/
public final class GfSseEventReceiver implements Closeable {
private enum State {
START,
COMMENT,
FIELD_NAME,
FIELD_VALUE_FIRST,
FIELD_VALUE,
EVENT_FIRED
}
private final InputStream inputStream;
private boolean closed = false;
/**
* Constructor.
*/
GfSseEventReceiver(InputStream inputStream) {
this.inputStream = inputStream;
}
public GfSseInboundEvent readEvent() throws IOException {
GfSseInboundEvent inboundEvent = new GfSseInboundEvent();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
State currentState = State.START;
String fieldName = null;
try {
int data = 0;
while((data = inputStream.read()) != -1) {
switch (currentState) {
case START:
if(data == ':') {
currentState = State.COMMENT;
} else if(data != '\n') {
baos.write(data);
currentState = State.FIELD_NAME;
} else if(data == '\n') {
if(!inboundEvent.isEmpty()) {
return inboundEvent;
}
inboundEvent = new GfSseInboundEvent();
}
break;
case COMMENT:
if(data == '\n') {
currentState = State.START;
}
break;
case FIELD_NAME:
if(data == ':') {
fieldName = baos.toString();
baos.reset();
currentState = State.FIELD_VALUE_FIRST;
} else if(data == '\n') {
processField(inboundEvent, baos.toString(), "".getBytes());
baos.reset();
currentState = State.START;
} else {
baos.write(data);
}
break;
case FIELD_VALUE_FIRST:
// first space has to be skipped
if(data != ' ') {
baos.write(data);
}
if(data == '\n') {
processField(inboundEvent, fieldName, baos.toByteArray());
baos.reset();
currentState = State.START;
break;
}
currentState = State.FIELD_VALUE;
break;
case FIELD_VALUE:
if(data == '\n') {
processField(inboundEvent, fieldName, baos.toByteArray());
baos.reset();
currentState = State.START;
} else {
baos.write(data);
}
break;
default:
//No-op default
}
}
if(data == -1) {
closed = true;
}
return null;
} catch (IOException e) {
closed = true;
throw e;
}
}
private void processField(GfSseInboundEvent inboundEvent, String name, byte[] value) {
switch (name) {
case "event":
inboundEvent.setName(new String(value));
break;
case "data":
inboundEvent.addData(value);
inboundEvent.addData(new byte[]{'\n'});
break;
case "id":
String s = "";
if (value != null) {
s = new String(value);
s = s.trim();
if (!s.matches("\\-?\\d+")) {
s = "";
}
} inboundEvent.setId(s);
break;
default:
break;
}
}
/**
* Get object state.
*
* @return true if no new {@link InboundEvent} can be received, false otherwise.
*/
public boolean isClosed() {
return closed;
}
@Override
public void close() throws IOException {
closed = true;
inputStream.close();
}
}