com.inmobi.conduit.CheckpointProviderFactory.java Source code

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Here is the source code for com.inmobi.conduit.CheckpointProviderFactory.java

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/*
* 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.inmobi.conduit;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Constructor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class CheckpointProviderFactory {
    private static final String DEFAULT_PROVIDER = "com.inmobi.conduit" + ".FSCheckpointProvider";
    private static final String CHECKPOINT_PROVIDER_DIR = "checkpointprovider" + ".dir";
    private static final String CHECKPOINT_PROVIDER = "checkpointprovider";
    private static final String CONDUIT_CONFIG = "conduit.cfg";

    private static final Log LOG = LogFactory.getLog(CheckpointProviderFactory.class);

    public static CheckpointProvider create(String config) throws Exception {
        CheckpointProvider checkPointProvider = null;
        InputStream in = new FileInputStream(config);
        if (in != null)
            checkPointProvider = getProvider(in);
        return checkPointProvider;
    }

    private static CheckpointProvider getProvider(InputStream in) throws Exception {
        CheckpointProvider provider = null;
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        try {
            String line;
            String providerName = null;
            String providerDir = null;
            do {
                line = reader.readLine();
                String[] keyVal = line.split("=");
                if (keyVal != null && keyVal.length == 2 && keyVal[0].equalsIgnoreCase(CHECKPOINT_PROVIDER)) {
                    //provider = (CheckpointProvider) Class.forName(keyVal[1])
                    //.newInstance();
                    providerName = keyVal[1];
                }
                if (keyVal != null && keyVal.length == 2 && keyVal[0].equalsIgnoreCase(CHECKPOINT_PROVIDER_DIR)) {
                    providerDir = keyVal[1];
                }
            } while (line != null);

            if (providerName != null && providerDir != null) {
                Class providerClass = Class.forName(providerName);
                Constructor constructor = providerClass.getConstructor(String.class);
                provider = (CheckpointProvider) constructor.newInstance(new Object[] { providerDir });
            }
        } catch (Exception e) {
            //return default provider
            LOG.debug("Error creating CheckPointProvider", e);
            return null;
        }
        return provider;
    }

}