/
QueueWireHandler.java
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/
QueueWireHandler.java
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/*
* Copyright 2015 Higher Frequency Trading
*
* http://www.higherfrequencytrading.com
*
* 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 net.openhft.chronicle.engine.client.internal;
import net.openhft.chronicle.bytes.Bytes;
import net.openhft.chronicle.bytes.NativeBytes;
import net.openhft.chronicle.engine.client.ClientWiredStatelessTcpConnectionHub;
import net.openhft.chronicle.engine.client.ClientWiredStatelessTcpConnectionHub.CoreFields;
import net.openhft.chronicle.engine.client.internal.ClientWiredChronicleQueueStateless.EventId;
import net.openhft.chronicle.network.WireHandler;
import net.openhft.chronicle.network.event.EventGroup;
import net.openhft.chronicle.network.event.WireHandlers;
import net.openhft.chronicle.queue.ChronicleQueue;
import net.openhft.chronicle.queue.ChronicleQueueBuilder;
import net.openhft.chronicle.queue.ExcerptAppender;
import net.openhft.chronicle.wire.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.StreamCorruptedException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import static net.openhft.chronicle.engine.client.internal.QueueWireHandler.Fields.reply;
/**
* Created by Rob Austin
*/
public class QueueWireHandler implements WireHandler, Consumer<WireHandlers> {
public static final int SIZE_OF_SIZE = ClientWiredStatelessTcpConnectionHub.SIZE_OF_SIZE;
private static final Logger LOG = LoggerFactory.getLogger(QueueWireHandler.class);
final StringBuilder cspText = new StringBuilder();
final StringBuilder eventName = new StringBuilder();
// assume there is a handler for each connection.
long tid = -1;
long cid = -1;
ChronicleQueue queue = null;
private WireHandlers publishLater;
private Wire inWire;
private Wire outWire;
private Map<Long, ChronicleQueue> cidToQueue = new ConcurrentHashMap<>();
private ConcurrentHashMap<String, Integer> cspToCid = new ConcurrentHashMap<>();
private ConcurrentHashMap<String, ChronicleQueue> fileNameToChronicle = new ConcurrentHashMap<>();
private AtomicInteger cidCounter = new AtomicInteger();
private Map<ChronicleQueue, ExcerptAppender> queueToAppender = new ConcurrentHashMap<>();
public QueueWireHandler() {
}
@Override
public void accept(WireHandlers wireHandlers) {
this.publishLater = wireHandlers;
}
@Override
public void process(Wire in, Wire out) throws StreamCorruptedException {
try {
this.inWire = in;
this.outWire = out;
onEvent();
} catch (Exception e) {
LOG.error("", e);
}
}
@SuppressWarnings("UnusedReturnValue")
void onEvent() throws IOException {
//Be careful not to use Wires.acquireStringBuilder() as we
//need to store the value
Bytes[] tmpBytes = {null};
inWire.readDocument(
w -> {
w.read(CoreFields.csp).text(cspText)
.read(CoreFields.tid).int64(x -> tid = x)
.read(CoreFields.cid).int64(x -> cid = x);
queue = getQueue(cspText);
}, dataWireIn -> {
ValueIn vin = inWire.readEventName(eventName);
tmpBytes[0] = NativeBytes.nativeBytes();
vin.bytes(tmpBytes[0]);
});
try {
// writes out the tid
outWire.writeDocument(true, wire -> outWire.write(CoreFields.tid).int64(tid));
if (EventId.lastWrittenIndex.contentEquals(eventName)) {
writeData(wireOut -> wireOut.write(reply).int64(queue.lastWrittenIndex()));
} else if (EventId.createAppender.contentEquals(eventName)) {
//only need one appender per queue
queueToAppender.computeIfAbsent(queue,
s -> {
try {
return queue.createAppender();
} catch (IOException e) {
e.printStackTrace();
}
return null;
});
outWire.writeDocument(false, wireOut -> {
throw new UnsupportedOperationException();
/*
QueueAppenderResponse qar = new QueueAppenderResponse();
qar.setCid(cid);
qar.setCsp(cspText);
wireOut.write(reply).typedMarshallable(qar);
*/
});
} else if (EventId.submit.contentEquals(eventName)) {
ExcerptAppender appender = queueToAppender.get(queue);
// new BinaryWire(tmpBytes).copyTo(new TextWire(appender.wire().bytes()));
tmpBytes[0].flip();
System.out.println(tmpBytes[0]);
appender.writeDocument(wo -> wo.bytes().write(tmpBytes[0]));
long index = appender.lastWrittenIndex();
outWire.writeDocument(false, wire -> wire.write(EventId.index).int64(appender.lastWrittenIndex()));
}
} finally {
if (EventGroup.IS_DEBUG) {
long len = outWire.bytes().position() - SIZE_OF_SIZE;
if (len == 0) {
System.out.println("--------------------------------------------\n" +
"server writes:\n\n<EMPTY>");
} else {
System.out.println("--------------------------------------------\n" +
"server writes:\n\n" +
Wires.fromSizePrefixedBlobs(outWire.bytes(), SIZE_OF_SIZE, len));
}
}
}
}
private ChronicleQueue getQueue(StringBuilder cspText) {
ChronicleQueue queue;
if (cid == 0) {
//cid hasn't been passed in need to map it from csp
cid = cspToCid.computeIfAbsent(cspText.toString(),
s -> cidCounter.incrementAndGet());
String[] parts = cspText.toString().split("/");
String filename = "/tmp/" + parts[1] + "/" + parts[2] + ".q";
queue = fileNameToChronicle.computeIfAbsent
(filename, s -> {
try {
return new ChronicleQueueBuilder(filename).build();
} catch (IOException e) {
e.printStackTrace();
}
return null;
});
cidToQueue.put(cid, queue);
} else {
//if the cid has been created then there must be a corresponding queue
queue = cidToQueue.get(cid);
assert queue != null;
}
return queue;
}
private void writeData(Consumer<WireOut> c) {
try {
outWire.bytes().mark();
outWire.writeDocument(false, c);
} catch (Exception e) {
outWire.bytes().reset();
final WireOut o = outWire.write(reply)
.type(e.getClass().getSimpleName());
if (e.getMessage() != null)
o.writeValue().text(e.getMessage());
LOG.error("", e);
}
}
// note : peter has asked for these to be in camel case
public enum Fields implements WireKey {
reply
}
}