Porting over lowresource-access-webapp examples

jetty · Feb 5, 2024 · f90ed75 · f90ed75
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diff --git a/standalone/lowresource-access/pom.xml b/standalone/lowresource-access/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.eclipse.jetty.examples</groupId>
+    <artifactId>jetty-standalone-examples</artifactId>
+    <version>9.4.x</version>
+  </parent>
+
+  <artifactId>lowresource-access</artifactId>
+  <packaging>war</packaging>
+  <name>lowresource-access</name>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <servlet.api.version>3.1.0</servlet.api.version>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>${servlet.api.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <!-- used to reference LowResourceMonitor -->
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-server</artifactId>
+      <version>${jetty.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-annotations</artifactId>
+      <version>${jetty.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-deploy</artifactId>
+      <version>${jetty.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-webapp</artifactId>
+      <version>${jetty.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <!-- test deps below -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>5.10.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <finalName>demo</finalName>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>3.1.0</version>
+        <executions>
+          <execution>
+            <id>copy-to-webapps</id>
+            <goals>
+              <goal>run</goal>
+            </goals>
+            <phase>install</phase>
+            <configuration>
+              <target>
+                <copy file="${project.build.directory}/${project.build.finalName}.war" todir="${project.basedir}/webapps/" />
+              </target>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/standalone/lowresource-access/src/main/java/examples/AbstractLowResourceDumpServlet.java b/standalone/lowresource-access/src/main/java/examples/AbstractLowResourceDumpServlet.java
@@ -0,0 +1,34 @@
+//
+// ========================================================================
+// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+// ========================================================================
+//
+
+package examples;
+
+import java.io.IOException;
+import java.util.Set;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServlet;
+
+import org.eclipse.jetty.server.LowResourceMonitor;
+
+public class AbstractLowResourceDumpServlet extends HttpServlet
+{
+    protected void dump(ServletOutputStream out, LowResourceMonitor monitor) throws IOException
+    {
+        Set<LowResourceMonitor.LowResourceCheck> checks = monitor.getLowResourceChecks();
+        out.println("LowResourceChecks: ");
+        for (LowResourceMonitor.LowResourceCheck check : checks)
+        {
+            out.println(String.format("   (%s) %s%n", check.getClass().getName(), check));
+        }
+    }
+}
diff --git a/standalone/lowresource-access/src/main/java/examples/FromBaseRequestServlet.java b/standalone/lowresource-access/src/main/java/examples/FromBaseRequestServlet.java
@@ -0,0 +1,40 @@
+//
+// ========================================================================
+// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+// ========================================================================
+//
+
+package examples;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.LowResourceMonitor;
+import org.eclipse.jetty.server.Request;
+import org.eclipse.jetty.server.Server;
+
+@WebServlet("/baserequest")
+public class FromBaseRequestServlet extends AbstractLowResourceDumpServlet
+{
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+    {
+        Server server = Request.getBaseRequest(request).getHttpChannel().getServer();
+
+        LowResourceMonitor monitor = server.getBean(LowResourceMonitor.class);
+
+        response.setCharacterEncoding("UTF-8");
+        response.setContentType("text/plain");
+        dump(response.getOutputStream(), monitor);
+    }
+}
diff --git a/standalone/lowresource-access/src/main/java/examples/FromRequestAttributeChannelServlet.java b/standalone/lowresource-access/src/main/java/examples/FromRequestAttributeChannelServlet.java
@@ -0,0 +1,41 @@
+//
+// ========================================================================
+// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+// ========================================================================
+//
+
+package examples;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.HttpChannel;
+import org.eclipse.jetty.server.LowResourceMonitor;
+import org.eclipse.jetty.server.Server;
+
+@WebServlet("/requestattribute/channel")
+public class FromRequestAttributeChannelServlet extends AbstractLowResourceDumpServlet
+{
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+    {
+        HttpChannel channel = (HttpChannel)request.getAttribute(HttpChannel.class.getName());
+        Server server = channel.getServer();
+
+        LowResourceMonitor monitor = server.getBean(LowResourceMonitor.class);
+
+        response.setCharacterEncoding("UTF-8");
+        response.setContentType("text/plain");
+        dump(response.getOutputStream(), monitor);
+    }
+}
diff --git a/...lone/lowresource-access/src/main/java/examples/FromRequestAttributeConnectionServlet.java b/...lone/lowresource-access/src/main/java/examples/FromRequestAttributeConnectionServlet.java
@@ -0,0 +1,41 @@
+//
+// ========================================================================
+// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+// ========================================================================
+//
+
+package examples;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.HttpConnection;
+import org.eclipse.jetty.server.LowResourceMonitor;
+import org.eclipse.jetty.server.Server;
+
+@WebServlet("/requestattribute/connection")
+public class FromRequestAttributeConnectionServlet extends AbstractLowResourceDumpServlet
+{
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+    {
+        HttpConnection connection = (HttpConnection)request.getAttribute(HttpConnection.class.getName());
+        Server server = connection.getServer();
+
+        LowResourceMonitor monitor = server.getBean(LowResourceMonitor.class);
+
+        response.setCharacterEncoding("UTF-8");
+        response.setContentType("text/plain");
+        dump(response.getOutputStream(), monitor);
+    }
+}
diff --git a/standalone/lowresource-access/src/main/java/examples/FromServletContextServlet.java b/standalone/lowresource-access/src/main/java/examples/FromServletContextServlet.java
@@ -0,0 +1,42 @@
+//
+// ========================================================================
+// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+// ========================================================================
+//
+
+package examples;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.LowResourceMonitor;
+
+@WebServlet("/servletcontext")
+public class FromServletContextServlet extends AbstractLowResourceDumpServlet
+{
+    private LowResourceMonitor monitor;
+
+    @Override
+    public void init() throws ServletException
+    {
+        monitor = (LowResourceMonitor)getServletContext().getAttribute(LowResourceMonitor.class.getName());
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+    {
+        response.setCharacterEncoding("UTF-8");
+        response.setContentType("text/plain");
+        dump(response.getOutputStream(), monitor);
+    }
+}
diff --git a/standalone/lowresource-access/src/main/webapp/WEB-INF/web.xml b/standalone/lowresource-access/src/main/webapp/WEB-INF/web.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
+		 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
+  <display-name>Accessing LowResourceMonitor from a Servlet</display-name>
+</web-app>