Merge branch 'stable-5.3' into stable-5.4

* stable-5.3:
  Run JMH benchmarks using bazel
  Benchmark for creating files and FileSnapshots
  Implement benchmark for looking up FileStore of a given Path
  JMH benchmark for SimpleLruCache
  Update API problem filters
  Remove unused API problem filters
  Silence API errors for new API added since 5.1.0

Change-Id: Ib735c4039e24ec8b045ae2cc81df1e9e5c9fa996
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

19 files changed, 1213 insertions, 0 deletions

diff --git a/org.eclipse.jgit.benchmarks/.classpath b/org.eclipse.jgit.benchmarks/.classpath
new file mode 100644
index 0000000000..438d155e31
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.classpath
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path=".apt_generated">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="target/generated-test-sources/test-annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/org.eclipse.jgit.benchmarks/.gitignore b/org.eclipse.jgit.benchmarks/.gitignore
new file mode 100644
index 0000000000..4972e7d795
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.gitignore
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+/target/
+/.apt_generated/
diff --git a/org.eclipse.jgit.benchmarks/.project b/org.eclipse.jgit.benchmarks/.project
new file mode 100644
index 0000000000..59be0016d3
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.jgit.benchmarks</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.resources.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000000..7a53139284
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.resources.prefs
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+eclipse.preferences.version=1
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.runtime.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 0000000000..5a0ad22d2a
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.core.runtime.prefs
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.apt.core.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.apt.core.prefs
new file mode 100644
index 0000000000..66f6a56a10
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.apt.core.prefs
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+eclipse.preferences.version=1
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.core.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000000..b276e89ac2
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+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.core.prefs
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.ui.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 0000000000..fef3713825
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,66 @@
+eclipse.preferences.version=1
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+formatter_profile=_JGit Format
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+sp_cleanup.add_default_serial_version_id=true
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+sp_cleanup.never_use_parentheses_in_expressions=true
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+sp_cleanup.remove_trailing_whitespaces_all=true
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.m2e.core.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.m2e.core.prefs
new file mode 100644
index 0000000000..f897a7f1cb
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.m2e.core.prefs
@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1
diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.tasks.ui.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.tasks.ui.prefs
new file mode 100644
index 0000000000..3dec4d97c7
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.tasks.ui.prefs
@@ -0,0 +1,3 @@
+eclipse.preferences.version=1
+project.repository.kind=bugzilla
+project.repository.url=https\://bugs.eclipse.org/bugs
diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.team.ui.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.team.ui.prefs
new file mode 100644
index 0000000000..ce7a0f0478
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.mylyn.team.ui.prefs
@@ -0,0 +1,2 @@
+commit.comment.template=${task.description} \n\nBug\: ${task.key}
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diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.api.tools.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.api.tools.prefs
new file mode 100644
index 0000000000..c0030ded71
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.api.tools.prefs
@@ -0,0 +1,104 @@
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+ANNOTATION_ELEMENT_TYPE_REMOVED_FIELD=Error
+ANNOTATION_ELEMENT_TYPE_REMOVED_METHOD=Error
+ANNOTATION_ELEMENT_TYPE_REMOVED_TYPE_MEMBER=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_API_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_REEXPORTED_API_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_REEXPORTED_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_TYPE=Error
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+CLASS_ELEMENT_TYPE_CHANGED_CONTRACTED_SUPERINTERFACES_SET=Error
+CLASS_ELEMENT_TYPE_CHANGED_DECREASE_ACCESS=Error
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+CLASS_ELEMENT_TYPE_CHANGED_NON_FINAL_TO_FINAL=Error
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+CLASS_ELEMENT_TYPE_REMOVED_FIELD=Error
+CLASS_ELEMENT_TYPE_REMOVED_METHOD=Error
+CLASS_ELEMENT_TYPE_REMOVED_SUPERCLASS=Error
+CLASS_ELEMENT_TYPE_REMOVED_TYPE_MEMBER=Error
+CLASS_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
+CONSTRUCTOR_ELEMENT_TYPE_ADDED_TYPE_PARAMETER=Error
+CONSTRUCTOR_ELEMENT_TYPE_CHANGED_DECREASE_ACCESS=Error
+CONSTRUCTOR_ELEMENT_TYPE_CHANGED_VARARGS_TO_ARRAY=Error
+CONSTRUCTOR_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
+ENUM_ELEMENT_TYPE_CHANGED_CONTRACTED_SUPERINTERFACES_SET=Error
+ENUM_ELEMENT_TYPE_CHANGED_TYPE_CONVERSION=Error
+ENUM_ELEMENT_TYPE_REMOVED_ENUM_CONSTANT=Error
+ENUM_ELEMENT_TYPE_REMOVED_FIELD=Error
+ENUM_ELEMENT_TYPE_REMOVED_METHOD=Error
+ENUM_ELEMENT_TYPE_REMOVED_TYPE_MEMBER=Error
+FIELD_ELEMENT_TYPE_ADDED_VALUE=Error
+FIELD_ELEMENT_TYPE_CHANGED_DECREASE_ACCESS=Error
+FIELD_ELEMENT_TYPE_CHANGED_FINAL_TO_NON_FINAL_STATIC_CONSTANT=Error
+FIELD_ELEMENT_TYPE_CHANGED_NON_FINAL_TO_FINAL=Error
+FIELD_ELEMENT_TYPE_CHANGED_NON_STATIC_TO_STATIC=Error
+FIELD_ELEMENT_TYPE_CHANGED_STATIC_TO_NON_STATIC=Error
+FIELD_ELEMENT_TYPE_CHANGED_TYPE=Error
+FIELD_ELEMENT_TYPE_CHANGED_VALUE=Error
+FIELD_ELEMENT_TYPE_REMOVED_TYPE_ARGUMENT=Error
+FIELD_ELEMENT_TYPE_REMOVED_VALUE=Error
+ILLEGAL_EXTEND=Warning
+ILLEGAL_IMPLEMENT=Warning
+ILLEGAL_INSTANTIATE=Warning
+ILLEGAL_OVERRIDE=Warning
+ILLEGAL_REFERENCE=Warning
+INTERFACE_ELEMENT_TYPE_ADDED_DEFAULT_METHOD=Error
+INTERFACE_ELEMENT_TYPE_ADDED_FIELD=Error
+INTERFACE_ELEMENT_TYPE_ADDED_METHOD=Error
+INTERFACE_ELEMENT_TYPE_ADDED_RESTRICTIONS=Error
+INTERFACE_ELEMENT_TYPE_ADDED_SUPER_INTERFACE_WITH_METHODS=Error
+INTERFACE_ELEMENT_TYPE_ADDED_TYPE_PARAMETER=Error
+INTERFACE_ELEMENT_TYPE_CHANGED_CONTRACTED_SUPERINTERFACES_SET=Error
+INTERFACE_ELEMENT_TYPE_CHANGED_TYPE_CONVERSION=Error
+INTERFACE_ELEMENT_TYPE_REMOVED_FIELD=Error
+INTERFACE_ELEMENT_TYPE_REMOVED_METHOD=Error
+INTERFACE_ELEMENT_TYPE_REMOVED_TYPE_MEMBER=Error
+INTERFACE_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
+INVALID_ANNOTATION=Ignore
+INVALID_JAVADOC_TAG=Ignore
+INVALID_REFERENCE_IN_SYSTEM_LIBRARIES=Error
+LEAK_EXTEND=Warning
+LEAK_FIELD_DECL=Warning
+LEAK_IMPLEMENT=Warning
+LEAK_METHOD_PARAM=Warning
+LEAK_METHOD_RETURN_TYPE=Warning
+METHOD_ELEMENT_TYPE_ADDED_RESTRICTIONS=Error
+METHOD_ELEMENT_TYPE_ADDED_TYPE_PARAMETER=Error
+METHOD_ELEMENT_TYPE_CHANGED_DECREASE_ACCESS=Error
+METHOD_ELEMENT_TYPE_CHANGED_NON_ABSTRACT_TO_ABSTRACT=Error
+METHOD_ELEMENT_TYPE_CHANGED_NON_FINAL_TO_FINAL=Error
+METHOD_ELEMENT_TYPE_CHANGED_NON_STATIC_TO_STATIC=Error
+METHOD_ELEMENT_TYPE_CHANGED_STATIC_TO_NON_STATIC=Error
+METHOD_ELEMENT_TYPE_CHANGED_VARARGS_TO_ARRAY=Error
+METHOD_ELEMENT_TYPE_REMOVED_ANNOTATION_DEFAULT_VALUE=Error
+METHOD_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
+MISSING_EE_DESCRIPTIONS=Warning
+TYPE_PARAMETER_ELEMENT_TYPE_ADDED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_ADDED_INTERFACE_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_INTERFACE_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_REMOVED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_REMOVED_INTERFACE_BOUND=Error
+UNUSED_PROBLEM_FILTERS=Warning
+automatically_removed_unused_problem_filters=false
+changed_execution_env=Error
+eclipse.preferences.version=1
+incompatible_api_component_version=Error
+incompatible_api_component_version_include_major_without_breaking_change=Disabled
+incompatible_api_component_version_include_minor_without_api_change=Disabled
+incompatible_api_component_version_report_major_without_breaking_change=Warning
+incompatible_api_component_version_report_minor_without_api_change=Ignore
+invalid_since_tag_version=Error
+malformed_since_tag=Error
+missing_since_tag=Error
+report_api_breakage_when_major_version_incremented=Disabled
+report_resolution_errors_api_component=Warning
diff --git a/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.core.prefs b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.core.prefs
new file mode 100644
index 0000000000..923c37fb8d
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.eclipse.pde.core.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+resolve.requirebundle=false
diff --git a/org.eclipse.jgit.benchmarks/.settings/org.jboss.tools.maven.apt.prefs b/org.eclipse.jgit.benchmarks/.settings/org.jboss.tools.maven.apt.prefs
new file mode 100644
index 0000000000..a5b4e1352f
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/.settings/org.jboss.tools.maven.apt.prefs
@@ -0,0 +1,3 @@
+eclipse.preferences.version=1
+org.jboss.tools.maven.apt.aptProcessDuringReconcile=true
+org.jboss.tools.maven.apt.mode=jdt_apt
diff --git a/org.eclipse.jgit.benchmarks/BUILD b/org.eclipse.jgit.benchmarks/BUILD
new file mode 100644
index 0000000000..3c6ff0e12b
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/BUILD
@@ -0,0 +1,13 @@
+load("//tools:bzl/jmh.bzl", "jmh_java_benchmarks")
+
+SRCS = glob(
+    ["src/**/*.java"],
+)
+
+jmh_java_benchmarks(
+    name = "benchmarks",
+    srcs = SRCS,
+    deps = [
+        "//org.eclipse.jgit:jgit",
+    ],
+)
\ No newline at end of file
diff --git a/org.eclipse.jgit.benchmarks/pom.xml b/org.eclipse.jgit.benchmarks/pom.xml
new file mode 100644
index 0000000000..86fbcf38c2
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/pom.xml
@@ -0,0 +1,195 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+   Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
+   and other copyright owners as documented in the project's IP log.
+
+   This program and the accompanying materials are made available
+   under the terms of the Eclipse Distribution License v1.0 which
+   accompanies this distribution, is reproduced below, and is
+   available at http://www.eclipse.org/org/documents/edl-v10.php
+
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or
+   without modification, are permitted provided that the following
+   conditions are met:
+
+   - Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+   - Redistributions in binary form must reproduce the above
+     copyright notice, this list of conditions and the following
+     disclaimer in the documentation and/or other materials provided
+     with the distribution.
+
+   - Neither the name of the Eclipse Foundation, Inc. nor the
+     names of its contributors may be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+   CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-->
+<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>
+
+    <groupId>org.eclipse.jgit</groupId>
+    <version>5.4.4-SNAPSHOT</version>
+    <artifactId>org.eclipse.jgit.benchmarks</artifactId>
+    <packaging>jar</packaging>
+
+    <name>JGit - JMH based benchmarks</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <javac.target>1.8</javac.target>
+        <jmh.version>1.21</jmh.version>
+        <uberjar.name>benchmarks</uberjar.name>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+           <groupId>org.eclipse.jgit</groupId>
+           <artifactId>org.eclipse.jgit</artifactId>
+           <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <sourceDirectory>src/</sourceDirectory>
+        <plugins>
+            <plugin>
+               <groupId>org.apache.maven.plugins</groupId>
+               <artifactId>maven-compiler-plugin</artifactId>
+               <version>3.8.1</version>
+               <configuration>
+                  <compilerVersion>${javac.target}</compilerVersion>
+                  <source>${javac.target}</source>
+                  <target>${javac.target}</target>
+                  <generatedSourcesDirectory>.apt_generated</generatedSourcesDirectory>
+               </configuration>
+               <executions>
+                  <execution>
+                     <id>compile-with-errorprone</id>
+                     <phase>compile</phase>
+                     <goals>
+                        <goal>compile</goal>
+                     </goals>
+                     <configuration>
+                        <compilerId>javac-with-errorprone</compilerId>
+                        <forceJavacCompilerUse>true</forceJavacCompilerUse>
+                        <compilerArgs>
+                           <arg>-Xep:ExpectedExceptionChecker:ERROR</arg>
+                        </compilerArgs>
+                     </configuration>
+                  </execution>
+               </executions>
+               <dependencies>
+                  <dependency>
+                     <groupId>org.codehaus.plexus</groupId>
+                     <artifactId>plexus-compiler-javac</artifactId>
+                     <version>2.8.5</version>
+                  </dependency>
+                  <dependency>
+                     <groupId>org.codehaus.plexus</groupId>
+                     <artifactId>plexus-compiler-javac-errorprone</artifactId>
+                     <version>2.8.5</version>
+                  </dependency>
+                  <!-- override plexus-compiler-javac-errorprone's dependency on
+                       Error Prone with the latest version -->
+                  <dependency>
+                     <groupId>com.google.errorprone</groupId>
+                     <artifactId>error_prone_core</artifactId>
+                     <version>2.3.3</version>
+                  </dependency>
+               </dependencies>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <finalName>${uberjar.name}</finalName>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>org.openjdk.jmh.Main</mainClass>
+                                </transformer>
+                            </transformers>
+                            <filters>
+                                <filter>
+                                    <!--
+                                        Shading signed JARs will fail without this.
+                                        http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar
+                                    -->
+                                    <artifact>*:*</artifact>
+                                    <excludes>
+                                        <exclude>META-INF/*.SF</exclude>
+                                        <exclude>META-INF/*.DSA</exclude>
+                                        <exclude>META-INF/*.RSA</exclude>
+                                    </excludes>
+                                </filter>
+                            </filters>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+        <pluginManagement>
+           <plugins>
+              <!--This plugin's configuration is used to store Eclipse m2e settings only.
+              It has no influence on the Maven build itself.-->
+              <plugin>
+                 <groupId>org.eclipse.m2e</groupId>
+                 <artifactId>lifecycle-mapping</artifactId>
+                 <version>1.0.0</version>
+                 <configuration>
+                    <lifecycleMappingMetadata>
+                       <pluginExecutions>
+                          <pluginExecution>
+                             <pluginExecutionFilter>
+                                <groupId>org.apache.maven.plugins</groupId>
+                                <artifactId>maven-antrun-plugin</artifactId>
+                                <versionRange>[1.8,)</versionRange>
+                                <goals>
+                                   <goal>run</goal>
+                                </goals>
+                             </pluginExecutionFilter>
+                             <action>
+                                <ignore></ignore>
+                             </action>
+                          </pluginExecution>
+                       </pluginExecutions>
+                    </lifecycleMappingMetadata>
+                 </configuration>
+              </plugin>
+           </plugins>
+        </pluginManagement>
+    </build>
+</project>
diff --git a/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/CreateFileSnapshotBenchmark.java b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/CreateFileSnapshotBenchmark.java
new file mode 100644
index 0000000000..ffe4a26d8b
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/CreateFileSnapshotBenchmark.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.benchmarks;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jgit.internal.storage.file.FileSnapshot;
+import org.eclipse.jgit.util.FileUtils;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@State(Scope.Thread)
+public class CreateFileSnapshotBenchmark {
+
+	Path path;
+
+	Path testDir;
+
+	@Setup
+	public void setupBenchmark() throws IOException {
+		testDir = Files.createTempDirectory("dir");
+		path = testDir.resolve("toSnapshot");
+		Files.createFile(path);
+	}
+
+	@TearDown
+	public void teardown() throws IOException {
+		FileUtils.delete(testDir.toFile(), FileUtils.RECURSIVE | FileUtils.RETRY);
+	}
+
+	@Benchmark
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+    @Warmup(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
+    @Measurement(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
+	public Path testCreateFile() throws IOException {
+		return Files.createTempFile(testDir, "create", "");
+	}
+
+	@Benchmark
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public FileSnapshot testCreateFileSnapshot() {
+		return FileSnapshot.save(path.toFile());
+	}
+
+	public static void main(String[] args) throws RunnerException {
+		Options opt = new OptionsBuilder()
+				.include(CreateFileSnapshotBenchmark.class.getSimpleName())
+				// .addProfiler(StackProfiler.class)
+				// .addProfiler(GCProfiler.class)
+				.forks(1).jvmArgs("-ea").build();
+		new Runner(opt).run();
+	}
+}
diff --git a/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/LookupFileStoreBenchmark.java b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/LookupFileStoreBenchmark.java
new file mode 100644
index 0000000000..61e23ccd81
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/LookupFileStoreBenchmark.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.benchmarks;
+
+import java.io.IOException;
+import java.nio.file.FileStore;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jgit.util.FileUtils;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.profile.StackProfiler;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@State(Scope.Thread)
+public class LookupFileStoreBenchmark {
+
+	Path path;
+
+	@Setup
+	public void setupBenchmark() throws IOException {
+		path = Files.createTempFile("test", "x");
+	}
+
+	@TearDown
+	public void teardown() throws IOException {
+		FileUtils.delete(path.toFile(), FileUtils.RETRY);
+	}
+
+	@Benchmark
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public FileStore testLookupFileStore() throws IOException {
+		FileStore fs = Files.getFileStore(path);
+		return fs;
+	}
+
+	public static void main(String[] args) throws RunnerException {
+		Options opt = new OptionsBuilder()
+				.include(LookupFileStoreBenchmark.class.getSimpleName())
+				.addProfiler(StackProfiler.class)
+				// .addProfiler(GCProfiler.class)
+				.forks(1).jvmArgs("-ea").build();
+		new Runner(opt).run();
+	}
+}
diff --git a/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java
new file mode 100644
index 0000000000..0f1d573af2
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.benchmarks;
+
+import java.security.SecureRandom;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jgit.util.SimpleLruCache;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Group;
+import org.openjdk.jmh.annotations.GroupThreads;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@State(Scope.Benchmark)
+public class SimpleLruCacheBenchmark {
+
+	SecureRandom rnd = new SecureRandom();
+
+	private volatile SimpleLruCache<String, String> cache = new SimpleLruCache<>(
+			100, 0.2f);
+
+	private volatile int i;
+
+	@Setup
+	public void setupBenchmark() {
+		i = rnd.nextInt(250);
+	}
+
+	@TearDown
+	public void teardown() {
+		cache = null;
+	}
+
+	@Benchmark
+	@Group("readwrite")
+	@GroupThreads(1)
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public SimpleLruCache<String, String> testCacheWrite() {
+		cache.put("k" + i, "v" + i);
+		return cache;
+	}
+
+	@Benchmark
+	@Group("readwrite")
+	@GroupThreads(1)
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public SimpleLruCache<String, String> testCacheRead() {
+		cache.get("k" + i);
+		return cache;
+	}
+
+	public static void main(String[] args) throws RunnerException {
+		Options opt = new OptionsBuilder()
+				.include(SimpleLruCacheBenchmark.class.getSimpleName())
+				// .addProfiler(StackProfiler.class)
+				// .addProfiler(GCProfiler.class)
+				.forks(1).jvmArgs("-ea").build();
+		new Runner(opt).run();
+	}
+}