com.twosigma.beaker.cpp.utils.TempCppFiles.java Source code

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Here is the source code for com.twosigma.beaker.cpp.utils.TempCppFiles.java

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/*
 *  Copyright 2017 TWO SIGMA OPEN SOURCE, LLC
 *
 *  Licensed 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 com.twosigma.beaker.cpp.utils;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;

public class TempCppFiles {

    public static final String BEAKER_HPP = "beaker.hpp";
    public static final String CPP = "cpp";
    public static final String CPP_BAT = "cpp.bat";
    public static final String CPP_KERNEL_H = "CppKernel.h";
    public static final String LIB_CRUN_JNILIB = "libCRun.jnilib";

    public static final String BEAKERX = "beakerx_";
    private Path tempDirectory;

    public TempCppFiles(String prefix) {
        tempDirectory = getTempDirectory(BEAKERX + prefix);
        copyFile(BEAKER_HPP);
        copyFile(CPP);
        copyFile(CPP_BAT);
        copyFile(CPP_KERNEL_H);
        copyFile(LIB_CRUN_JNILIB);
        addShutdownHookToDeleteTempDirectory();
    }

    public synchronized void close() {
        try {
            if (tempDirectory != null) {
                FileUtils.deleteDirectory(tempDirectory.toFile());
                tempDirectory = null;
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private void addShutdownHookToDeleteTempDirectory() {
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                super.run();
                close();
            }
        });
    }

    private void copyFile(String fileName) {
        InputStream is = this.getClass().getClassLoader().getResourceAsStream(fileName);

        OutputStream os = null;
        try {
            os = new FileOutputStream(tempDirectory.toString() + "/" + fileName);
            byte[] buffer = new byte[4096];
            int length;
            while ((length = is.read(buffer)) > 0) {
                os.write(buffer, 0, length);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                os.close();
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        File file = new File(tempDirectory.toString() + "/" + fileName);
        file.setExecutable(true);
    }

    private Path getTempDirectory(String prefix) {
        try {
            return Files.createTempDirectory(prefix);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public String getPath() {
        return tempDirectory.toString();
    }
}