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Add memoryref sample application
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‎memoryref/pom.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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# Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<groupId>com.github.chrishantha.sample</groupId>
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<artifactId>java-samples</artifactId>
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<version>0.0.2-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>memoryref</artifactId>
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<packaging>jar</packaging>
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<name>memoryref</name>
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<dependencies>
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<dependency>
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<groupId>com.github.chrishantha.sample</groupId>
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<artifactId>base</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<executions>
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<execution>
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<configuration>
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<transformers>
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<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<manifestEntries>
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<Premain-class>com.github.chrishantha.sample.memoryref.JavaAgent</Premain-class>
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</manifestEntries>
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</transformer>
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</transformers>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/A.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class A extends Base {
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final B b;
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final C c;
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A() {
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b = new B();
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c = new C(b);
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}
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@Override
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public long getSize() {
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return super.getSize() + b.getSize() + c.getSize();
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}
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/B.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class B extends Base {
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final D d;
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final E e;
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B() {
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d = new D();
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e = new E();
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}
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@Override
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public long getSize() {
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return super.getSize() + d.getSize() + e.getSize();
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}
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/Base.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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import java.util.Random;
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public abstract class Base {
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private final byte[] bytes;
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private static final Random random = new Random();
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Base() {
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bytes = new byte[(10 * (1 + random.nextInt(10))) * 1024 * 1024];
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}
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public long getSize() {
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return JavaAgent.getObjectSize(this) + JavaAgent.getObjectSize(bytes);
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}
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/C.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class C extends Base {
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final E e;
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final F f;
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C(B b) {
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this.e = b.e;
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f = new F();
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}
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@Override
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public long getSize() {
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return super.getSize() + f.getSize();
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}
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/D.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class D extends Base {
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/E.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class E extends Base {
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/F.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class F extends Base {
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/G.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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public class G extends Base {
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}

‎memoryref/src/main/java/com/github/chrishantha/sample/memoryref/JavaAgent.java‎

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/*
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* Copyright 2019 M. Isuru Tharanga Chrishantha Perera
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.github.chrishantha.sample.memoryref;
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import java.lang.instrument.Instrumentation;
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public class JavaAgent {
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private static volatile Instrumentation instrumentation;
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public static void premain(final String agentArgs, final Instrumentation instrumentation) {
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JavaAgent.instrumentation = instrumentation;
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}
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public static long getObjectSize(final Object object) {
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if (instrumentation == null) {
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return -1L;
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}
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return instrumentation.getObjectSize(object);
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}
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}

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