#728 XeMemory

src/main/java/org/takes/rs/xe/XeMemory.java

@@ -0,0 +1,105 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2017 Yegor Bugayenko
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.takes.rs.xe;
+
+import lombok.EqualsAndHashCode;
+import org.xembly.Directive;
+import org.xembly.Directives;
+
+/**
+ * Xembly source to report memory usage.
+ *
+ * <p>Add this Xembly source to your page like this:
+ *
+ * <pre> new RsXembly(
+ *   new XsStylesheet("/xsl/home.xsl"),
+ *   new XsAppend(
+ *     "page",
+ *     new XsMemory()
+ *   )
+ * )</pre>
+ *
+ * <p>And expect this attribute in the XML:
+ *
+ * <pre>&lt;?xml version="1.0"?&gt;
+ * &lt;?xml-stylesheet href="/xsl/home.xsl" type="text/xsl"?&gt;
+ * &lt;page&gt;
+ * &lt;memory&gt;free="1344" max="2048" total="334"&lt;/memory&gt;
+ * &lt;/page&gt;
+ * </pre>
+ *
+ * <p>The class is immutable and thread-safe.
+ *
+ * @author Yegor Bugayenko (yegor256@gmail.com)
+ * @version $Id$
+ * @since 1.2
+ */
+@EqualsAndHashCode(callSuper = true)
+public final class XeMemory extends XeWrap {
+
+    /**
+     * Ctor.
+     */
+    public XeMemory() {
+        this("memory");
+    }
+
+    /**
+     * Ctor.
+     * @param node Node name
+     */
+    public XeMemory(final CharSequence node) {
+        super(
+            new XeSource() {
+                @Override
+                public Iterable<Directive> toXembly() {
+                    return new Directives().add(node.toString())
+                        .attr(
+                            "total",
+                            XeMemory.mbs(Runtime.getRuntime().totalMemory())
+                        )
+                        .attr(
+                            "free",
+                            XeMemory.mbs(Runtime.getRuntime().freeMemory())
+                        )
+                        .attr(
+                            "max",
+                            XeMemory.mbs(Runtime.getRuntime().maxMemory())
+                        );
+                }
+            }
+        );
+    }
+
+    /**
+     * Format memory.
+     * @param bytes Bytes
+     * @return Mbytes
+     */
+    private static long mbs(final long bytes) {
+        // @checkstyle MagicNumber (1 line)
+        return bytes >> 20;
+    }
+
+}

src/main/java/org/takes/rs/xe/XeMillis.java

@@ -30,6 +30,25 @@
 /**
  * Xembly source to create "millis" element at the root.
  *
+ * <p>Add this Xembly source to your page like this:
+ *
+ * <pre> new RsXembly(
+ *   new XsStylesheet("/xsl/home.xsl"),
+ *   new XsAppend(
+ *     "page",
+ *     new XsMillis()
+ *   )
+ * )</pre>
+ *
+ * <p>And expect this attribute in the XML:
+ *
+ * <pre>&lt;?xml version="1.0"?&gt;
+ * &lt;?xml-stylesheet href="/xsl/home.xsl" type="text/xsl"?&gt;
+ * &lt;page&gt;
+ * &lt;millis&gt;3.675&lt;/millis&gt;
+ * &lt;/page&gt;
+ * </pre>
+ *
  * <p>The class is immutable and thread-safe.
  *
  * @author Yegor Bugayenko (yegor256@gmail.com)

src/test/java/org/takes/rs/xe/XeMemoryTest.java

@@ -0,0 +1,61 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2017 Yegor Bugayenko
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.takes.rs.xe;
+
+import com.jcabi.matchers.XhtmlMatchers;
+import java.io.IOException;
+import org.apache.commons.io.IOUtils;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test case for {@link XeMemory}.
+ * @author Yegor Bugayenko (yegor256@gmail.com)
+ * @version $Id$
+ * @since 1.2
+ */
+public final class XeMemoryTest {
+
+    /**
+     * XeMemory can build XML response.
+     * @throws IOException If some problem inside
+     */
+    @Test
+    public void buildsXmlResponse() throws IOException {
+        MatcherAssert.assertThat(
+            IOUtils.toString(
+                new RsXembly(
+                    new XeAppend(
+                        "root",
+                        new XeMemory()
+                    )
+                ).body()
+            ),
+            XhtmlMatchers.hasXPaths(
+                "/root/memory[@total and @max and @free]"
+            )
+        );
+    }
+
+}