io.netty.handler.codec.spdy.SpdySession Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.handler.codec.spdy;
import io.netty.channel.ChannelPromise;
import io.netty.util.internal.PlatformDependent;
import java.util.Comparator;
import java.util.Map;
import java.util.Queue;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
final class SpdySession {
private final AtomicInteger activeLocalStreams = new AtomicInteger();
private final AtomicInteger activeRemoteStreams = new AtomicInteger();
private final Map activeStreams = PlatformDependent.newConcurrentHashMap();
private final StreamComparator streamComparator = new StreamComparator();
private final AtomicInteger sendWindowSize;
private final AtomicInteger receiveWindowSize;
SpdySession(int sendWindowSize, int receiveWindowSize) {
this.sendWindowSize = new AtomicInteger(sendWindowSize);
this.receiveWindowSize = new AtomicInteger(receiveWindowSize);
}
int numActiveStreams(boolean remote) {
if (remote) {
return activeRemoteStreams.get();
} else {
return activeLocalStreams.get();
}
}
boolean noActiveStreams() {
return activeStreams.isEmpty();
}
boolean isActiveStream(int streamId) {
return activeStreams.containsKey(streamId);
}
// Stream-IDs should be iterated in priority order
Map activeStreams() {
Map streams = new TreeMap(streamComparator);
streams.putAll(activeStreams);
return streams;
}
void acceptStream(
int streamId, byte priority, boolean remoteSideClosed, boolean localSideClosed,
int sendWindowSize, int receiveWindowSize, boolean remote) {
if (!remoteSideClosed || !localSideClosed) {
StreamState state = activeStreams.put(streamId, new StreamState(
priority, remoteSideClosed, localSideClosed, sendWindowSize, receiveWindowSize));
if (state == null) {
if (remote) {
activeRemoteStreams.incrementAndGet();
} else {
activeLocalStreams.incrementAndGet();
}
}
}
}
private StreamState removeActiveStream(int streamId, boolean remote) {
StreamState state = activeStreams.remove(streamId);
if (state != null) {
if (remote) {
activeRemoteStreams.decrementAndGet();
} else {
activeLocalStreams.decrementAndGet();
}
}
return state;
}
void removeStream(int streamId, Throwable cause, boolean remote) {
StreamState state = removeActiveStream(streamId, remote);
if (state != null) {
state.clearPendingWrites(cause);
}
}
boolean isRemoteSideClosed(int streamId) {
StreamState state = activeStreams.get(streamId);
return state == null || state.isRemoteSideClosed();
}
void closeRemoteSide(int streamId, boolean remote) {
StreamState state = activeStreams.get(streamId);
if (state != null) {
state.closeRemoteSide();
if (state.isLocalSideClosed()) {
removeActiveStream(streamId, remote);
}
}
}
boolean isLocalSideClosed(int streamId) {
StreamState state = activeStreams.get(streamId);
return state == null || state.isLocalSideClosed();
}
void closeLocalSide(int streamId, boolean remote) {
StreamState state = activeStreams.get(streamId);
if (state != null) {
state.closeLocalSide();
if (state.isRemoteSideClosed()) {
removeActiveStream(streamId, remote);
}
}
}
/*
* hasReceivedReply and receivedReply are only called from channelRead()
* no need to synchronize access to the StreamState
*/
boolean hasReceivedReply(int streamId) {
StreamState state = activeStreams.get(streamId);
return state != null && state.hasReceivedReply();
}
void receivedReply(int streamId) {
StreamState state = activeStreams.get(streamId);
if (state != null) {
state.receivedReply();
}
}
int getSendWindowSize(int streamId) {
if (streamId == SPDY_SESSION_STREAM_ID) {
return sendWindowSize.get();
}
StreamState state = activeStreams.get(streamId);
return state != null ? state.getSendWindowSize() : -1;
}
int updateSendWindowSize(int streamId, int deltaWindowSize) {
if (streamId == SPDY_SESSION_STREAM_ID) {
return sendWindowSize.addAndGet(deltaWindowSize);
}
StreamState state = activeStreams.get(streamId);
return state != null ? state.updateSendWindowSize(deltaWindowSize) : -1;
}
int updateReceiveWindowSize(int streamId, int deltaWindowSize) {
if (streamId == SPDY_SESSION_STREAM_ID) {
return receiveWindowSize.addAndGet(deltaWindowSize);
}
StreamState state = activeStreams.get(streamId);
if (state == null) {
return -1;
}
if (deltaWindowSize > 0) {
state.setReceiveWindowSizeLowerBound(0);
}
return state.updateReceiveWindowSize(deltaWindowSize);
}
int getReceiveWindowSizeLowerBound(int streamId) {
if (streamId == SPDY_SESSION_STREAM_ID) {
return 0;
}
StreamState state = activeStreams.get(streamId);
return state != null ? state.getReceiveWindowSizeLowerBound() : 0;
}
void updateAllSendWindowSizes(int deltaWindowSize) {
for (StreamState state: activeStreams.values()) {
state.updateSendWindowSize(deltaWindowSize);
}
}
void updateAllReceiveWindowSizes(int deltaWindowSize) {
for (StreamState state: activeStreams.values()) {
state.updateReceiveWindowSize(deltaWindowSize);
if (deltaWindowSize < 0) {
state.setReceiveWindowSizeLowerBound(deltaWindowSize);
}
}
}
boolean putPendingWrite(int streamId, PendingWrite pendingWrite) {
StreamState state = activeStreams.get(streamId);
return state != null && state.putPendingWrite(pendingWrite);
}
PendingWrite getPendingWrite(int streamId) {
if (streamId == SPDY_SESSION_STREAM_ID) {
for (Map.Entry e: activeStreams().entrySet()) {
StreamState state = e.getValue();
if (state.getSendWindowSize() > 0) {
PendingWrite pendingWrite = state.getPendingWrite();
if (pendingWrite != null) {
return pendingWrite;
}
}
}
return null;
}
StreamState state = activeStreams.get(streamId);
return state != null ? state.getPendingWrite() : null;
}
PendingWrite removePendingWrite(int streamId) {
StreamState state = activeStreams.get(streamId);
return state != null ? state.removePendingWrite() : null;
}
private static final class StreamState {
private final byte priority;
private boolean remoteSideClosed;
private boolean localSideClosed;
private boolean receivedReply;
private final AtomicInteger sendWindowSize;
private final AtomicInteger receiveWindowSize;
private int receiveWindowSizeLowerBound;
private final Queue pendingWriteQueue = new ConcurrentLinkedQueue();
StreamState(
byte priority, boolean remoteSideClosed, boolean localSideClosed,
int sendWindowSize, int receiveWindowSize) {
this.priority = priority;
this.remoteSideClosed = remoteSideClosed;
this.localSideClosed = localSideClosed;
this.sendWindowSize = new AtomicInteger(sendWindowSize);
this.receiveWindowSize = new AtomicInteger(receiveWindowSize);
}
byte getPriority() {
return priority;
}
boolean isRemoteSideClosed() {
return remoteSideClosed;
}
void closeRemoteSide() {
remoteSideClosed = true;
}
boolean isLocalSideClosed() {
return localSideClosed;
}
void closeLocalSide() {
localSideClosed = true;
}
boolean hasReceivedReply() {
return receivedReply;
}
void receivedReply() {
receivedReply = true;
}
int getSendWindowSize() {
return sendWindowSize.get();
}
int updateSendWindowSize(int deltaWindowSize) {
return sendWindowSize.addAndGet(deltaWindowSize);
}
int updateReceiveWindowSize(int deltaWindowSize) {
return receiveWindowSize.addAndGet(deltaWindowSize);
}
int getReceiveWindowSizeLowerBound() {
return receiveWindowSizeLowerBound;
}
void setReceiveWindowSizeLowerBound(int receiveWindowSizeLowerBound) {
this.receiveWindowSizeLowerBound = receiveWindowSizeLowerBound;
}
boolean putPendingWrite(PendingWrite msg) {
return pendingWriteQueue.offer(msg);
}
PendingWrite getPendingWrite() {
return pendingWriteQueue.peek();
}
PendingWrite removePendingWrite() {
return pendingWriteQueue.poll();
}
void clearPendingWrites(Throwable cause) {
for (;;) {
PendingWrite pendingWrite = pendingWriteQueue.poll();
if (pendingWrite == null) {
break;
}
pendingWrite.fail(cause);
}
}
}
private final class StreamComparator implements Comparator {
StreamComparator() { }
@Override
public int compare(Integer id1, Integer id2) {
StreamState state1 = activeStreams.get(id1);
StreamState state2 = activeStreams.get(id2);
int result = state1.getPriority() - state2.getPriority();
if (result != 0) {
return result;
}
return id1 - id2;
}
}
public static final class PendingWrite {
final SpdyDataFrame spdyDataFrame;
final ChannelPromise promise;
PendingWrite(SpdyDataFrame spdyDataFrame, ChannelPromise promise) {
this.spdyDataFrame = spdyDataFrame;
this.promise = promise;
}
void fail(Throwable cause) {
spdyDataFrame.release();
promise.setFailure(cause);
}
}
}