flink版本: flink-1.11.2
提取主类代码位置: org.apache.flink.client.program.PackagedProgram#getEntryPointClassNameFromJar
提取第三方依赖代码位置:org.apache.flink.client.program.PackagedProgram#getJobJarAndDependencies
代码逻辑比较简单，此处不再赘述，在此记录方便后续使用
完整代码:
java
/*
* 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.flink.client.program;
import org.apache.flink.api.common.ProgramDescription;
import org.apache.flink.client.ClientUtils;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings;
import org.apache.flink.util.InstantiationUtil;
import org.apache.flink.util.JarUtils;
import javax.annotation.Nullable;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.stream.Collectors;
import static org.apache.flink.client.program.PackagedProgramUtils.isPython;
import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* This class encapsulates represents a program, packaged in a jar file. It supplies functionality
* to extract nested libraries, search for the program entry point, and extract a program plan.
*/
public class PackagedProgram {
/**
* Property name of the entry in JAR manifest file that describes the Flink specific entry
* point.
*/
public static final String MANIFEST_ATTRIBUTE_ASSEMBLER_CLASS = "program-class";
/**
* Property name of the entry in JAR manifest file that describes the class with the main
* method.
*/
public static final String MANIFEST_ATTRIBUTE_MAIN_CLASS = "Main-Class";
// --------------------------------------------------------------------------------------------
private final URL jarFile;
private final String[] args;
private final Class<?> mainClass;
private final List<File> extractedTempLibraries;
private final List<URL> classpaths;
private final ClassLoader userCodeClassLoader;
private final SavepointRestoreSettings savepointSettings;
/**
* Flag indicating whether the job is a Python job.
*/
private final boolean isPython;
/**
* Creates an instance that wraps the plan defined in the jar file using the given arguments.
* For generating the plan the class defined in the className parameter is used.
*
* @param jarFile The jar file which contains the plan.
* @param classpaths Additional classpath URLs needed by the Program.
* @param entryPointClassName Name of the class which generates the plan. Overrides the class
* defined in the jar file manifest.
* @param configuration Flink configuration which affects the classloading policy of the Program
* execution.
* @param args Optional. The arguments used to create the pact plan, depend on implementation of
* the pact plan. See getDescription().
* @throws ProgramInvocationException This invocation is thrown if the Program can't be properly
* loaded. Causes may be a missing / wrong class or manifest files.
*/
private PackagedProgram(@Nullable File jarFile, List<URL> classpaths,
@Nullable String entryPointClassName, Configuration configuration,
SavepointRestoreSettings savepointRestoreSettings, String... args)
throws ProgramInvocationException {
this.classpaths = checkNotNull(classpaths);
this.savepointSettings = checkNotNull(savepointRestoreSettings);
this.args = checkNotNull(args);
checkArgument(jarFile != null || entryPointClassName != null,
"Either the jarFile or the entryPointClassName needs to be non-null.");
// whether the job is a Python job.
this.isPython = isPython(entryPointClassName);
// load the jar file if exists
this.jarFile = loadJarFile(jarFile);
assert this.jarFile != null || entryPointClassName != null;
// now that we have an entry point, we can extract the nested jar files (if any)
this.extractedTempLibraries = this.jarFile == null ? Collections.emptyList()
: extractContainedLibraries(this.jarFile);
this.userCodeClassLoader = ClientUtils.buildUserCodeClassLoader(getJobJarAndDependencies(),
classpaths, getClass().getClassLoader(), configuration);
// load the entry point class
this.mainClass = loadMainClass(
// if no entryPointClassName name was given, we try and look one up through
// the manifest
entryPointClassName != null ? entryPointClassName : getEntryPointClassNameFromJar(this.jarFile),
userCodeClassLoader);
if (!hasMainMethod(mainClass)) {
throw new ProgramInvocationException(
"The given program class does not have a main(String[]) method.");
}
}
public SavepointRestoreSettings getSavepointSettings() {
return savepointSettings;
}
public String[] getArguments() {
return this.args;
}
public String getMainClassName() {
return this.mainClass.getName();
}
/**
* Returns the description provided by the Program class. This may contain a description of the
* plan itself and its arguments.
*
* @return The description of the PactProgram's input parameters.
* @throws ProgramInvocationException This invocation is thrown if the Program can't be properly
* loaded. Causes may be a missing / wrong class or manifest files.
*/
@Nullable
public String getDescription() throws ProgramInvocationException {
if (ProgramDescription.class.isAssignableFrom(this.mainClass)) {
ProgramDescription descr;
try {
descr =
InstantiationUtil.instantiate(
this.mainClass.asSubclass(ProgramDescription.class),
ProgramDescription.class);
} catch (Throwable t) {
return null;
}
try {
return descr.getDescription();
} catch (Throwable t) {
throw new ProgramInvocationException(
"Error while getting the program description"
+ (t.getMessage() == null ? "." : ": " + t.getMessage()),
t);
}
} else {
return null;
}
}
/**
* This method assumes that the context environment is prepared, or the execution will be a
* local execution by default.
*/
public void invokeInteractiveModeForExecution() throws ProgramInvocationException {
callMainMethod(mainClass, args);
}
/**
* Returns the classpaths that are required by the program.
*
* @return List of {@link java.net.URL}s.
*/
public List<URL> getClasspaths() {
return this.classpaths;
}
/**
* Gets the {@link java.lang.ClassLoader} that must be used to load user code classes.
*
* @return The user code ClassLoader.
*/
public ClassLoader getUserCodeClassLoader() {
return this.userCodeClassLoader;
}
/**
* Returns all provided libraries needed to run the program.
*/
public List<URL> getJobJarAndDependencies() {
List<URL> libs = new ArrayList<URL>(extractedTempLibraries.size() + 1);
if (jarFile != null) {
libs.add(jarFile);
}
for (File tmpLib : extractedTempLibraries) {
try {
libs.add(tmpLib.getAbsoluteFile().toURI().toURL());
} catch (MalformedURLException e) {
throw new RuntimeException("URL is invalid. This should not happen.", e);
}
}
if (isPython) {
libs.add(PackagedProgramUtils.getPythonJar());
}
return libs;
}
/**
* Returns all provided libraries needed to run the program.
*/
public static List<URL> getJobJarAndDependencies(
File jarFile, @Nullable String entryPointClassName) throws ProgramInvocationException {
URL jarFileUrl = loadJarFile(jarFile);
List<File> extractedTempLibraries =
jarFileUrl == null
? Collections.emptyList()
: extractContainedLibraries(jarFileUrl);
List<URL> libs = new ArrayList<URL>(extractedTempLibraries.size() + 1);
if (jarFileUrl != null) {
libs.add(jarFileUrl);
}
for (File tmpLib : extractedTempLibraries) {
try {
libs.add(tmpLib.getAbsoluteFile().toURI().toURL());
} catch (MalformedURLException e) {
throw new RuntimeException("URL is invalid. This should not happen.", e);
}
}
if (isPython(entryPointClassName)) {
libs.add(PackagedProgramUtils.getPythonJar());
}
return libs;
}
/**
* Deletes all temporary files created for contained packaged libraries.
*/
public void deleteExtractedLibraries() {
deleteExtractedLibraries(this.extractedTempLibraries);
this.extractedTempLibraries.clear();
}
private static boolean hasMainMethod(Class<?> entryClass) {
Method mainMethod;
try {
mainMethod = entryClass.getMethod("main", String[].class);
} catch (NoSuchMethodException e) {
return false;
} catch (Throwable t) {
throw new RuntimeException(
"Could not look up the main(String[]) method from the class "
+ entryClass.getName()
+ ": "
+ t.getMessage(),
t);
}
return Modifier.isStatic(mainMethod.getModifiers())
&& Modifier.isPublic(mainMethod.getModifiers());
}
private static void callMainMethod(Class<?> entryClass, String[] args) throws ProgramInvocationException {
Method mainMethod;
if (!Modifier.isPublic(entryClass.getModifiers())) {
throw new ProgramInvocationException(
"The class " + entryClass.getName() + " must be public.");
}
try {
mainMethod = entryClass.getMethod("main", String[].class);
} catch (NoSuchMethodException e) {
throw new ProgramInvocationException(
"The class " + entryClass.getName() + " has no main(String[]) method.");
} catch (Throwable t) {
throw new ProgramInvocationException(
"Could not look up the main(String[]) method from the class "
+ entryClass.getName() + ": " + t.getMessage(),
t);
}
if (!Modifier.isStatic(mainMethod.getModifiers())) {
throw new ProgramInvocationException(
"The class " + entryClass.getName() + " declares a non-static main method.");
}
if (!Modifier.isPublic(mainMethod.getModifiers())) {
throw new ProgramInvocationException(
"The class " + entryClass.getName() + " declares a non-public main method.");
}
try {
mainMethod.invoke(null, (Object) args);
} catch (IllegalArgumentException e) {
throw new ProgramInvocationException(
"Could not invoke the main method, arguments are not matching.", e);
} catch (IllegalAccessException e) {
throw new ProgramInvocationException(
"Access to the main method was denied: " + e.getMessage(), e);
} catch (InvocationTargetException e) {
Throwable exceptionInMethod = e.getTargetException();
if (exceptionInMethod instanceof Error) {
throw (Error) exceptionInMethod;
} else if (exceptionInMethod instanceof ProgramParametrizationException) {
throw (ProgramParametrizationException) exceptionInMethod;
} else if (exceptionInMethod instanceof ProgramInvocationException) {
throw (ProgramInvocationException) exceptionInMethod;
} else {
throw new ProgramInvocationException(
"The main method caused an error: " + exceptionInMethod.getMessage(),
exceptionInMethod);
}
} catch (Throwable t) {
throw new ProgramInvocationException(
"An error occurred while invoking the program's main method: " + t.getMessage(),
t);
}
}
private static String getEntryPointClassNameFromJar(URL jarFile)
throws ProgramInvocationException {
JarFile jar;
Manifest manifest;
String className;
// Open jar file
try {
jar = new JarFile(new File(jarFile.toURI()));
} catch (URISyntaxException use) {
throw new ProgramInvocationException(
"Invalid file path '" + jarFile.getPath() + "'", use);
} catch (IOException ioex) {
throw new ProgramInvocationException(
"Error while opening jar file '"
+ jarFile.getPath()
+ "'. "
+ ioex.getMessage(),
ioex);
}
// jar file must be closed at the end
try {
// Read from jar manifest
try {
manifest = jar.getManifest();
} catch (IOException ioex) {
throw new ProgramInvocationException(
"The Manifest in the jar file could not be accessed '"
+ jarFile.getPath()
+ "'. "
+ ioex.getMessage(),
ioex);
}
if (manifest == null) {
throw new ProgramInvocationException(
"No manifest found in jar file '"
+ jarFile.getPath()
+ "'. The manifest is need to point to the program's main class.");
}
Attributes attributes = manifest.getMainAttributes();
// check for a "program-class" entry first
className = attributes.getValue(PackagedProgram.MANIFEST_ATTRIBUTE_ASSEMBLER_CLASS);
if (className != null) {
return className;
}
// check for a main class
className = attributes.getValue(PackagedProgram.MANIFEST_ATTRIBUTE_MAIN_CLASS);
if (className != null) {
return className;
} else {
throw new ProgramInvocationException(
"Neither a '"
+ MANIFEST_ATTRIBUTE_MAIN_CLASS
+ "', nor a '"
+ MANIFEST_ATTRIBUTE_ASSEMBLER_CLASS
+ "' entry was found in the jar file.");
}
} finally {
try {
jar.close();
} catch (Throwable t) {
throw new ProgramInvocationException(
"Could not close the JAR file: " + t.getMessage(), t);
}
}
}
@Nullable
private static URL loadJarFile(File jar) throws ProgramInvocationException {
if (jar != null) {
URL jarFileUrl;
try {
jarFileUrl = jar.getAbsoluteFile().toURI().toURL();
} catch (MalformedURLException e1) {
throw new IllegalArgumentException("The jar file path is invalid.");
}
checkJarFile(jarFileUrl);
return jarFileUrl;
} else {
return null;
}
}
private static Class<?> loadMainClass(String className, ClassLoader cl)
throws ProgramInvocationException {
ClassLoader contextCl = null;
try {
contextCl = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(cl);
return Class.forName(className, false, cl);
} catch (ClassNotFoundException e) {
throw new ProgramInvocationException(
"The program's entry point class '"
+ className
+ "' was not found in the jar file.",
e);
} catch (ExceptionInInitializerError e) {
throw new ProgramInvocationException(
"The program's entry point class '"
+ className
+ "' threw an error during initialization.",
e);
} catch (LinkageError e) {
throw new ProgramInvocationException(
"The program's entry point class '"
+ className
+ "' could not be loaded due to a linkage failure.",
e);
} catch (Throwable t) {
throw new ProgramInvocationException(
"The program's entry point class '"
+ className
+ "' caused an exception during initialization: "
+ t.getMessage(),
t);
} finally {
if (contextCl != null) {
Thread.currentThread().setContextClassLoader(contextCl);
}
}
}
/**
* Takes all JAR files that are contained in this program's JAR file and extracts them to the
* system's temp directory.
*
* @return The file names of the extracted temporary files.
* @throws ProgramInvocationException Thrown, if the extraction process failed.
*/
public static List<File> extractContainedLibraries(URL jarFile)
throws ProgramInvocationException {
try (final JarFile jar = new JarFile(new File(jarFile.toURI()))) {
final List<JarEntry> containedJarFileEntries = getContainedJarEntries(jar);
if (containedJarFileEntries.isEmpty()) {
return Collections.emptyList();
}
final List<File> extractedTempLibraries =
new ArrayList<>(containedJarFileEntries.size());
boolean incomplete = true;
try {
final Random rnd = new Random();
final byte[] buffer = new byte[4096];
for (final JarEntry entry : containedJarFileEntries) {
// '/' as in case of zip, jar
// java.util.zip.ZipEntry#isDirectory always looks only for '/' not for
// File.separator
final String name = entry.getName().replace('/', '_');
final File tempFile = copyLibToTempFile(name, rnd, jar, entry, buffer);
extractedTempLibraries.add(tempFile);
}
incomplete = false;
} finally {
if (incomplete) {
deleteExtractedLibraries(extractedTempLibraries);
}
}
return extractedTempLibraries;
} catch (Throwable t) {
throw new ProgramInvocationException(
"Unknown I/O error while extracting contained jar files.", t);
}
}
private static File copyLibToTempFile(
String name, Random rnd, JarFile jar, JarEntry input, byte[] buffer)
throws ProgramInvocationException {
final File output = createTempFile(rnd, input, name);
try (final OutputStream out = new FileOutputStream(output);
final InputStream in = new BufferedInputStream(jar.getInputStream(input))) {
int numRead = 0;
while ((numRead = in.read(buffer)) != -1) {
out.write(buffer, 0, numRead);
}
return output;
} catch (IOException e) {
throw new ProgramInvocationException(
"An I/O error occurred while extracting nested library '"
+ input.getName()
+ "' to temporary file '"
+ output.getAbsolutePath()
+ "'.");
}
}
private static File createTempFile(Random rnd, JarEntry entry, String name)
throws ProgramInvocationException {
try {
final File tempFile = File.createTempFile(rnd.nextInt(Integer.MAX_VALUE) + "_", name);
tempFile.deleteOnExit();
return tempFile;
} catch (IOException e) {
throw new ProgramInvocationException(
"An I/O error occurred while creating temporary file to extract nested library '"
+ entry.getName()
+ "'.",
e);
}
}
private static List<JarEntry> getContainedJarEntries(JarFile jar) {
return jar.stream()
.filter(
jarEntry -> {
final String name = jarEntry.getName();
return name.length() > 8
&& name.startsWith("lib/")
&& name.endsWith(".jar");
})
.collect(Collectors.toList());
}
private static void deleteExtractedLibraries(List<File> tempLibraries) {
for (File f : tempLibraries) {
f.delete();
}
}
private static void checkJarFile(URL jarfile) throws ProgramInvocationException {
try {
JarUtils.checkJarFile(jarfile);
} catch (IOException e) {
throw new ProgramInvocationException(e.getMessage(), e);
} catch (Throwable t) {
throw new ProgramInvocationException(
"Cannot access jar file"
+ (t.getMessage() == null ? "." : ": " + t.getMessage()),
t);
}
}
/**
* A Builder For {@link PackagedProgram}.
*/
public static class Builder {
@Nullable
private File jarFile;
@Nullable
private String entryPointClassName;
private String[] args = new String[0];
private List<URL> userClassPaths = Collections.emptyList();
private Configuration configuration = new Configuration();
private SavepointRestoreSettings savepointRestoreSettings = SavepointRestoreSettings.none();
public Builder setJarFile(@Nullable File jarFile) {
this.jarFile = jarFile;
return this;
}
public Builder setUserClassPaths(List<URL> userClassPaths) {
this.userClassPaths = userClassPaths;
return this;
}
public Builder setEntryPointClassName(@Nullable String entryPointClassName) {
this.entryPointClassName = entryPointClassName;
return this;
}
public Builder setArguments(String... args) {
this.args = args;
return this;
}
public Builder setConfiguration(Configuration configuration) {
this.configuration = configuration;
return this;
}
public Builder setSavepointRestoreSettings(
SavepointRestoreSettings savepointRestoreSettings) {
this.savepointRestoreSettings = savepointRestoreSettings;
return this;
}
public PackagedProgram build() throws ProgramInvocationException {
if (jarFile == null && entryPointClassName == null) {
throw new IllegalArgumentException(
"The jarFile and entryPointClassName can not be null at the same time.");
}
return new PackagedProgram(
jarFile,
userClassPaths,
entryPointClassName,
configuration,
savepointRestoreSettings,
args);
}
private Builder() {
}
}
public static Builder newBuilder() {
return new Builder();
}
}