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java/org/apache/tomcat/util/net/SocketProcessorBase.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.tomcat.util.net;
+
+import java.util.Objects;
+
+public abstract class SocketProcessorBase<S> implements Runnable {
+
+    protected SocketWrapperBase<S> socketWrapper;
+    protected SocketEvent event;
+
+    public SocketProcessorBase(SocketWrapperBase<S> socketWrapper, SocketEvent event) {
+        reset(socketWrapper, event);
+    }
+
+
+    public void reset(SocketWrapperBase<S> socketWrapper, SocketEvent event) {
+        Objects.requireNonNull(event);
+        this.socketWrapper = socketWrapper;
+        this.event = event;
+    }
+
+
+    @Override
+    public final void run() {
+        synchronized (socketWrapper) {
+            // It is possible that processing may be triggered for read and
+            // write at the same time. The sync above makes sure that processing
+            // does not occur in parallel. The test below ensures that if the
+            // first event to be processed results in the socket being closed,
+            // the subsequent events are not processed.
+            if (socketWrapper.isClosed()) {
+                return;
+            }
+            doRun();
+        }
+    }
+
+
+    protected abstract void doRun();
+}