org.kaazing.k3po.control.internal.Control Maven / Gradle / Ivy
/**
* Copyright 2007-2015, Kaazing Corporation. 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.
*/
package org.kaazing.k3po.control.internal;
import static java.lang.Integer.parseInt;
import static java.lang.String.format;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.io.BufferedReader;
import java.io.Closeable;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.kaazing.k3po.control.internal.command.AbortCommand;
import org.kaazing.k3po.control.internal.command.AwaitCommand;
import org.kaazing.k3po.control.internal.command.Command;
import org.kaazing.k3po.control.internal.command.NotifyCommand;
import org.kaazing.k3po.control.internal.command.PrepareCommand;
import org.kaazing.k3po.control.internal.command.StartCommand;
import org.kaazing.k3po.control.internal.event.CommandEvent;
import org.kaazing.k3po.control.internal.event.ErrorEvent;
import org.kaazing.k3po.control.internal.event.FinishedEvent;
import org.kaazing.k3po.control.internal.event.NotifiedEvent;
import org.kaazing.k3po.control.internal.event.PreparedEvent;
import org.kaazing.k3po.control.internal.event.StartedEvent;
/**
* Control class for controlling the robot.
* This class establishes a tcp connection and can be fed commands to run.
*/
public final class Control {
private static final String FINISHED_EVENT = "FINISHED";
private static final String ERROR_EVENT = "ERROR";
private static final String STARTED_EVENT = "STARTED";
private static final String PREPARED_EVENT = "PREPARED";
private static final String NOTIFIED_EVENT = "NOTIFIED";
private static final Pattern HEADER_PATTERN = Pattern.compile("([a-z\\-]+):([^\n]+)");
private static final Charset UTF_8 = Charset.forName("UTF-8");
private final URL location;
private URLConnection connection;
BufferedReader textIn;
/**
* @param location of k3po server to connect to.
*/
public Control(URL location) {
this.location = location;
}
/**
* Connects to the k3po server.
* @throws Exception if fails to connect.
*/
public void connect() throws Exception {
// connection must be null if the connection failed
URLConnection newConnection = location.openConnection();
newConnection.connect();
connection = newConnection;
InputStream bytesIn = connection.getInputStream();
CharsetDecoder decoder = UTF_8.newDecoder();
textIn = new BufferedReader(new InputStreamReader(bytesIn, decoder));
}
/**
* Discoonects from the k3po server.
* @throws Exception if error in closing the connection.
*/
public void disconnect() throws Exception {
if (connection != null) {
try {
if (connection instanceof Closeable) {
((Closeable) connection).close();
} else {
try {
connection.getInputStream().close();
} catch (IOException e) {
// ignore
}
try {
connection.getOutputStream().close();
} catch (IOException e) {
// ignore
}
}
} finally {
connection = null;
}
}
}
/**
* Writes a command to the wire.
* @param command to write to the wire
* @throws Exception if the command is not recognized
*/
public void writeCommand(Command command) throws Exception {
checkConnected();
switch (command.getKind()) {
case PREPARE:
writeCommand((PrepareCommand) command);
break;
case START:
writeCommand((StartCommand) command);
break;
case ABORT:
writeCommand((AbortCommand) command);
break;
case AWAIT:
writeCommand((AwaitCommand) command);
break;
case NOTIFY:
writeCommand((NotifyCommand) command);
break;
default:
throw new IllegalArgumentException("Urecognized command kind: " + command.getKind());
}
}
/**
* Reads a CommandEvent from the connection with K3po.
* @return CommandEvent
* @throws Exception if no event is available to be read.
*/
public CommandEvent readEvent() throws Exception {
// defaults to infinite
return readEvent(0, MILLISECONDS);
}
/**
* Reads a command event from the wire.
* @param timeout is the time to read from the connection.
* @param unit of time for the timeout.
* @return the CommandEvent read from the wire.
* @throws Exception if no event is read before the timeout.
*/
public CommandEvent readEvent(int timeout, TimeUnit unit) throws Exception {
checkConnected();
connection.setReadTimeout((int) unit.toMillis(timeout));
String eventType = textIn.readLine();
if (eventType != null) {
switch (eventType) {
case PREPARED_EVENT:
return readPreparedEvent();
case STARTED_EVENT:
return readStartedEvent();
case ERROR_EVENT:
return readErrorEvent();
case FINISHED_EVENT:
return readFinishedEvent();
case NOTIFIED_EVENT:
return readNotifiedEvent();
}
}
throw new IllegalStateException("Invalid protocol frame: " + eventType);
}
private void checkConnected() throws Exception {
if (connection == null) {
throw new IllegalStateException("Not connected");
}
}
public boolean isConnected() {
return connection != null;
}
private void writeCommand(PrepareCommand prepare) throws Exception {
OutputStream bytesOut = connection.getOutputStream();
CharsetEncoder encoder = UTF_8.newEncoder();
Writer textOut = new OutputStreamWriter(bytesOut, encoder);
Iterable names = prepare.getNames();
List overriddenScriptProperties = prepare.getOverriddenScriptProperties();
int contentLength = 0;
StringBuilder content = new StringBuilder();
if (overriddenScriptProperties != null) {
for (String property : overriddenScriptProperties) {
content.append(format("property %s\n", property));
}
contentLength = content.length();
}
textOut.append("PREPARE\n");
textOut.append("version:2.0\n");
textOut.append(String.format("content-length:%s\n", contentLength));
for (String name : names) {
textOut.append(format("name:%s\n", name));
}
textOut.append("\n");
textOut.append(content.toString());
textOut.flush();
}
private void writeCommand(StartCommand start) throws Exception {
OutputStream bytesOut = connection.getOutputStream();
CharsetEncoder encoder = UTF_8.newEncoder();
Writer textOut = new OutputStreamWriter(bytesOut, encoder);
textOut.append("START\n");
textOut.append("\n");
textOut.flush();
}
private void writeCommand(AbortCommand abort) throws IOException, CharacterCodingException {
OutputStream bytesOut = connection.getOutputStream();
CharsetEncoder encoder = UTF_8.newEncoder();
Writer textOut = new OutputStreamWriter(bytesOut, encoder);
textOut.append("ABORT\n");
textOut.append("\n");
textOut.flush();
}
private void writeCommand(NotifyCommand notify) throws IOException, CharacterCodingException {
OutputStream bytesOut = connection.getOutputStream();
CharsetEncoder encoder = UTF_8.newEncoder();
Writer textOut = new OutputStreamWriter(bytesOut, encoder);
textOut.append("NOTIFY\n");
textOut.append(format("barrier:%s\n", notify.getBarrier()));
textOut.append("\n");
textOut.flush();
}
private void writeCommand(AwaitCommand await) throws IOException, CharacterCodingException {
OutputStream bytesOut = connection.getOutputStream();
CharsetEncoder encoder = UTF_8.newEncoder();
Writer textOut = new OutputStreamWriter(bytesOut, encoder);
textOut.append("AWAIT\n");
textOut.append(format("barrier:%s\n", await.getBarrier()));
textOut.append("\n");
textOut.flush();
}
private PreparedEvent readPreparedEvent() throws IOException {
PreparedEvent prepared = new PreparedEvent();
String line;
int length = -1;
do {
line = textIn.readLine();
Matcher matcher = HEADER_PATTERN.matcher(line);
if (matcher.matches()) {
String headerName = matcher.group(1);
String headerValue = matcher.group(2);
switch (headerName) {
case "content-length":
length = parseInt(headerValue);
break;
case "name":
// compatibility
break;
case "barrier":
prepared.getBarriers().add(headerValue);
break;
default:
// NOP allow unrecognized headers for future compatibility
}
}
} while (!line.isEmpty());
// note: this assumes bytes-length == string-length (ASCII)
// note: zero-length script should be non-null
if (length >= 0) {
prepared.setScript(readContent(length));
}
return prepared;
}
private StartedEvent readStartedEvent() throws IOException {
StartedEvent started = new StartedEvent();
String line;
do {
line = textIn.readLine();
Matcher matcher = HEADER_PATTERN.matcher(line);
if (matcher.matches()) {
String headerName = matcher.group(1);
switch (headerName) {
case "name":
// compatibility
break;
default:
// NOP allow unrecognized headers for future compatibility
}
}
} while (!line.isEmpty());
return started;
}
private FinishedEvent readFinishedEvent() throws IOException {
FinishedEvent finished = new FinishedEvent();
String line;
int length = -1;
do {
line = textIn.readLine();
Matcher matcher = HEADER_PATTERN.matcher(line);
if (matcher.matches()) {
String headerName = matcher.group(1);
String headerValue = matcher.group(2);
switch (headerName) {
case "content-length":
length = parseInt(headerValue);
break;
case "name":
// compatibility
break;
case "notified":
finished.getCompletedBarriers().add(headerValue);
break;
case "awaiting":
finished.getIncompleteBarriers().add(headerValue);
break;
default:
// NOP allow unrecognized headers for future compatibility
}
}
} while (!line.isEmpty());
// note: this assumes bytes-length == string-length (ASCII)
// note: zero-length script should be non-null
if (length >= 0) {
finished.setScript(readContent(length));
}
return finished;
}
private NotifiedEvent readNotifiedEvent() throws IOException {
NotifiedEvent notified = new NotifiedEvent();
String line;
do {
line = textIn.readLine();
Matcher matcher = HEADER_PATTERN.matcher(line);
if (matcher.matches()) {
String headerName = matcher.group(1);
String headerValue = matcher.group(2);
switch (headerName) {
case "barrier":
notified.setBarrier(headerValue);
break;
default:
// NOP allow unrecognized headers for future compatibility
}
}
} while (!line.isEmpty());
return notified;
}
private ErrorEvent readErrorEvent() throws IOException {
ErrorEvent error = new ErrorEvent();
String line;
int length = 0;
do {
line = textIn.readLine();
Matcher matcher = HEADER_PATTERN.matcher(line);
if (matcher.matches()) {
String headerName = matcher.group(1);
String headerValue = matcher.group(2);
switch (headerName) {
case "content-length":
length = parseInt(headerValue);
break;
case "summary":
error.setSummary(headerValue);
break;
case "name":
// compatibility
break;
default:
// NOP allow unrecognized headers for future compatibility
}
}
} while (!line.isEmpty());
// note: this assumes bytes-length == string-length (ASCII)
if (length > 0) {
error.setDescription(readContent(length));
}
return error;
}
private String readContent(final int length) throws IOException {
final char[] content = new char[length];
int bytesRead = 0;
do {
int result = textIn.read(content, bytesRead, length - bytesRead);
if (result == -1) {
throw new EOFException("EOF detected before all content read");
}
bytesRead += result;
} while (bytesRead != length);
return new String(content);
}
public void notifyBarrier(String barrierName) throws Exception {
final NotifyCommand notifyCommand = new NotifyCommand();
notifyCommand.setBarrier(barrierName);
this.writeCommand(notifyCommand);
}
public void sendAwaitBarrier(String barrierName) throws Exception {
final AwaitCommand awaitCommand = new AwaitCommand();
awaitCommand.setBarrier(barrierName);
this.writeCommand(awaitCommand);
}
}
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