org.asimba.utility.storage.jgroups.RetrieveRepeater.java Source code

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Here is the source code for org.asimba.utility.storage.jgroups.RetrieveRepeater.java

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package org.asimba.utility.storage.jgroups;

import com.alfaariss.oa.OAException;
import com.alfaariss.oa.SystemErrors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author jan
 */
public class RetrieveRepeater<T> {
    private int repeats;
    private long sleep;
    private long invocations;
    private long[] repetitions;
    private long failures;
    private boolean logFailures = false;
    private String logLabel = RetrieveRepeater.class.getName();
    private static final Log log = LogFactory.getLog(RetrieveRepeater.class);

    public RetrieveRepeater(int repeats, long sleep) {
        this.repeats = repeats;
        this.sleep = sleep;
        this.invocations = 0;
        this.failures = 0;
        this.repetitions = new long[repeats + 1];
    }

    public T get(HashMapStore<T> store) throws OAException {
        T result = null;
        try {
            result = repeat(store);
        } catch (Exception e) {
            throw new OAException(SystemErrors.ERROR_INTERNAL, e);
        }

        return result;
    }

    private T repeat(HashMapStore<T> store) throws Exception {
        if (repeats <= 0) {
            return store.get();
        }
        int cycle = 0;
        T result;

        invocations++;
        while ((result = store.get()) == null && cycle < this.repeats) {
            Thread.sleep(cycle * this.sleep);
            this.repetitions[cycle] += 1;
            ++cycle;
            if (logFailures) {
                log.debug(logLabel + ": retrieving value failed, cycle: " + cycle);
            }
        }

        if (result == null) {
            ++failures;
            if (logFailures) {
                log.debug(logLabel + ": retrieving value failed, max cycles reached");
            }
        }

        return result;
    }

    public void setFailureLogging(boolean doLog, String label) {
        this.logFailures = doLog;
        this.logLabel = label;
    }

    public void logReport(Log logger) {
        logger.info("");
        logger.info(RetrieveRepeater.class.toString());
        logger.info("Invocations: " + invocations);
        logger.info("Successes per cycle (0 means direct succes):");
        for (int i = 0; i < repetitions.length; ++i) {
            logger.info("  " + i + " after " + (i * sleep) + " msecs: " + repetitions[i]);
        }
        logger.info("Failures: " + failures);
        logger.info("");
    }

    public long[] getRepetitions() {
        return repetitions;
    }

    public boolean isFailureLogging() {
        return this.logFailures;
    }
}