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/*
* Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.runtime;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Base64;
import java.util.Map;
/**
* A code cache for persistent caching of compiled scripts.
*/
final class CodeStore {
private final File dir;
private final int minSize;
// Message digest to file name encoder
private final static Base64.Encoder BASE64 = Base64.getUrlEncoder().withoutPadding();
// Default minimum size for storing a compiled script class
private final static int DEFAULT_MIN_SIZE = 1000;
/**
* Constructor
* @param path directory to store code in
* @throws IOException
*/
public CodeStore(final String path) throws IOException {
this(path, DEFAULT_MIN_SIZE);
}
/**
* Constructor
* @param path directory to store code in
* @param minSize minimum file size for caching scripts
* @throws IOException
*/
public CodeStore(final String path, final int minSize) throws IOException {
this.dir = checkDirectory(path);
this.minSize = minSize;
}
private static File checkDirectory(final String path) throws IOException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction<File>() {
@Override
public File run() throws IOException {
final File dir = new File(path).getAbsoluteFile();
if (!dir.exists() && !dir.mkdirs()) {
throw new IOException("Could not create directory: " + dir);
} else if (!dir.isDirectory()) {
throw new IOException("Not a directory: " + dir);
} else if (!dir.canRead() || !dir.canWrite()) {
throw new IOException("Directory not readable or writable: " + dir);
}
return dir;
}
});
} catch (PrivilegedActionException e) {
throw (IOException) e.getException();
}
}
/**
* Return a compiled script from the cache, or null if it isn't found.
*
* @param source the source
* @return the compiled script or null
* @throws IOException
* @throws ClassNotFoundException
*/
public CompiledScript getScript(final Source source) throws IOException, ClassNotFoundException {
if (source.getLength() < minSize) {
return null;
}
final String digest = BASE64.encodeToString(source.getDigest());
final File file = new File(dir, digest);
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction<CompiledScript>() {
@Override
public CompiledScript run() throws IOException, ClassNotFoundException {
if (!file.exists()) {
return null;
}
try (ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(new FileInputStream(file)))) {
CompiledScript compiledScript = (CompiledScript) in.readObject();
compiledScript.setSource(source);
return compiledScript;
}
}
});
} catch (PrivilegedActionException e) {
final Exception ex = e.getException();
if (ex instanceof IOException) {
throw (IOException) ex;
} else if (ex instanceof ClassNotFoundException) {
throw (ClassNotFoundException) ex;
}
throw (new RuntimeException(ex));
}
}
/**
* Store a compiled script in the cache.
*
* @param source the source
* @param mainClassName the main class name
* @param classBytes a map of class bytes
* @param constants the constants array
* @throws IOException
*/
public void putScript(final Source source, final String mainClassName, final Map<String, byte[]> classBytes, final Object[] constants)
throws IOException {
if (source.getLength() < minSize) {
return;
}
for (final Object constant : constants) {
// Make sure all constant data is serializable
if (! (constant instanceof Serializable)) {
return;
}
}
final String digest = BASE64.encodeToString(source.getDigest());
final File file = new File(dir, digest);
final CompiledScript script = new CompiledScript(source, mainClassName, classBytes, constants);
try {
AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
@Override
public Void run() throws IOException {
try (ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(file)))) {
out.writeObject(script);
}
return null;
}
});
} catch (PrivilegedActionException e) {
throw (IOException) e.getException();
}
}
}
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