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java/org/apache/coyote/http2/ConnectionSettingsLocal.java

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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF 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
+ *
+ *      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.apache.coyote.http2;
+
+import java.util.Map;
+
+/**
+ * Represents the local connection settings i.e. the settings the client is
+ * expected to use when communicating with the server. There will be a delay
+ * between calling a setter and the setting taking effect at the client. When a
+ * setter is called, the new value is added to the set of pending settings. Once
+ * the ACK is received, the new value is moved to the current settings. While
+ * waiting for the ACK, the getters will return the most lenient / generous /
+ * relaxed of the current setting and the pending setting. This class does not
+ * validate the values passed to the setters. If an invalid value is used the
+ * client will respond (almost certainly by closing the connection) as defined
+ * in the HTTP/2 specification.
+ */
+public class ConnectionSettingsLocal extends ConnectionSettingsBase<IllegalArgumentException> {
+
+    private static final String ENDPOINT_NAME = "Local(client->server)";
+
+    private boolean sendInProgress = false;
+
+
+    public ConnectionSettingsLocal(String connectionId) {
+        super(connectionId);
+    }
+
+
+    @Override
+    protected synchronized void set(Setting setting, Long value) {
+        checkSend();
+        if (current.get(setting).longValue() == value.longValue()) {
+            pending.remove(setting);
+        } else {
+            pending.put(setting, value);
+        }
+    }
+
+
+    synchronized byte[] getSettingsFrameForPending() {
+        checkSend();
+        int payloadSize = pending.size() * 6;
+        byte[] result = new byte[9 + payloadSize];
+
+        ByteUtil.setThreeBytes(result, 0, payloadSize);
+        result[3] = FrameType.SETTINGS.getIdByte();
+        // No flags
+        // Stream is zero
+        // Payload
+        int pos = 9;
+        for (Map.Entry<Setting,Long> setting : pending.entrySet()) {
+            ByteUtil.setTwoBytes(result, pos, setting.getKey().getId());
+            pos += 2;
+            ByteUtil.setFourBytes(result, pos, setting.getValue().longValue());
+            pos += 4;
+        }
+        sendInProgress = true;
+        return result;
+    }
+
+
+    synchronized boolean ack() {
+        if (sendInProgress) {
+            sendInProgress = false;
+            current.putAll(pending);
+            pending.clear();
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+
+    private void checkSend() {
+        if (sendInProgress) {
+            // Coding error. No need for i18n
+            throw new IllegalStateException();
+        }
+    }
+
+
+    @Override
+    void throwException(String msg, Http2Error error) throws IllegalArgumentException {
+        throw new IllegalArgumentException(msg);
+    }
+
+
+    @Override
+    final String getEndpointName() {
+        return ENDPOINT_NAME;
+    }
+}