com.netflix.exhibitor.core.config.none.NoneConfigProvider.java Source code

Introduction

Here is the source code for com.netflix.exhibitor.core.config.none.NoneConfigProvider.java

Source

/*
 * Copyright 2012 Netflix, Inc.
 *
 *    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.netflix.exhibitor.core.config.none;

import com.google.common.io.Closeables;
import com.netflix.exhibitor.core.activity.ActivityLog;
import com.netflix.exhibitor.core.config.ConfigCollection;
import com.netflix.exhibitor.core.config.ConfigProvider;
import com.netflix.exhibitor.core.config.LoadedInstanceConfig;
import com.netflix.exhibitor.core.config.PropertyBasedInstanceConfig;
import com.netflix.exhibitor.core.config.PseudoLock;
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.OutputStream;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

// TODO

public class NoneConfigProvider implements ConfigProvider {
    private final File directory;
    private final Properties defaultProperties;

    private static final String FILE_NAME = "exhibitor.properties";

    public NoneConfigProvider(String directory) {
        this(directory, new Properties());
    }

    public NoneConfigProvider(String directory, Properties defaultProperties) {
        this.defaultProperties = defaultProperties;
        this.directory = new File(directory);
    }

    @Override
    public void start() throws Exception {
        // NOP
    }

    @Override
    public void close() throws IOException {
        // NOP
    }

    @Override
    public LoadedInstanceConfig loadConfig() throws Exception {
        File propertiesFile = new File(directory, FILE_NAME);
        Properties properties = new Properties();
        if (propertiesFile.exists()) {
            BufferedInputStream in = new BufferedInputStream(new FileInputStream(propertiesFile));
            try {
                properties.load(in);
            } finally {
                Closeables.closeQuietly(in);
            }
        }
        PropertyBasedInstanceConfig config = new PropertyBasedInstanceConfig(properties, defaultProperties);
        return new LoadedInstanceConfig(config, propertiesFile.lastModified());
    }

    @Override
    public LoadedInstanceConfig storeConfig(ConfigCollection config, long compareVersion) throws Exception {
        File propertiesFile = new File(directory, FILE_NAME);
        PropertyBasedInstanceConfig propertyBasedInstanceConfig = new PropertyBasedInstanceConfig(config);

        long lastModified = 0;
        OutputStream out = new BufferedOutputStream(new FileOutputStream(propertiesFile));
        try {
            propertyBasedInstanceConfig.getProperties().store(out, "Auto-generated by Exhibitor");
            lastModified = propertiesFile.lastModified();
        } finally {
            Closeables.closeQuietly(out);
        }

        return new LoadedInstanceConfig(propertyBasedInstanceConfig, lastModified);
    }

    @Override
    public PseudoLock newPseudoLock() throws Exception {
        return new PseudoLock() {
            @Override
            public boolean lock(ActivityLog log, long maxWait, TimeUnit unit) throws Exception {
                return true;
            }

            @Override
            public void unlock() throws Exception {
                // NOP
            }
        };
    }
}