* </ul>
 *
 * <p>This class is similar to {@link MoreExecutors#newSequentialExecutor}. This class is different
 * in a few ways:
 *
 * <ul>
 *   <li>Each task may be associated with a different executor.
 *   <li>Tasks may be of type {@code AsyncCallable}.
 *   <li>Running tasks <i>cannot</i> be interrupted. (Note that {@code newSequentialExecutor} does

 * actions taken by the java garbage collection system:
 *
 * <ul>
 *   <li>invoking the {@code finalize} methods of unreachable objects
 *   <li>clearing weak references to unreachable referents
 *   <li>enqueuing weak references to unreachable referents in their reference queue
 * </ul>
 *

 * webservers, RPC servers and timers.
 *
 * <p>The normal lifecycle of a service is:
 *
 * <ul>
 *   <li>{@linkplain State#NEW NEW} -&gt;
 *   <li>{@linkplain State#STARTING STARTING} -&gt;
 *   <li>{@linkplain State#RUNNING RUNNING} -&gt;
 *   <li>{@linkplain State#STOPPING STOPPING} -&gt;
 *   <li>{@linkplain State#TERMINATED TERMINATED}
 * </ul>
 *

 * </p>
 * <ul>
 * <li>{@literal file}</li>
 * <li>{@literal jar}</li>
 * <li>{@literal wsjar} (WebShpere独自プロトコル、{@literal jar}の別名)</li>
 * <li>{@literal zip} (WebLogic独自プロトコル、通常のZipファイルは{@literal jar}プロトコルを使用してください)</li>
 * <li>{@literal code-source} (Oracle AS(OC4J)独自プロトコル)</li>
 * <li>{@literal vfsfile} (JBossAS5独自プロトコル、{@literal file}の別名)</li>
 * <li>{@literal vfszip} (JBossAS5独自プロトコル)</li>
 * </ul>
 *
 * @author koichik

   *
   * <ul>
   *   <li>it may split surrogate pairs
   *   <li>it may split characters and combining characters
   *   <li>it does not consider word boundaries
   *   <li>if truncating for display to users, there are other considerations that must be taken
   *       into account
   *   <li>the appropriate truncation indicator may be locale-dependent

   *
   * <ol>
   *   <li>The state of the RateLimiter (storedPermits) is a vertical line in this figure.
   *   <li>When the RateLimiter is not used, this goes right (up to maxPermits)
   *   <li>When the RateLimiter is used, this goes left (down to zero), since if we have
   *       storedPermits, we serve from those first

     * <p><b>Algorithm:</b>
     * If the given path is a directory, then there is a choice:
     * </p>
     * <ul>
     *   <li><b>Package hierarchy:</b> if a {@code module-info.class} file is found at the root,
     *       then builds a singleton map with the module name declared in that descriptor.</li>
     *   <li><b>Module hierarchy:</b> if {@code module-info.class} files are found in sub-directories,

   *   <li>If there is any non-private constructor or non-private static factory method declared by
   *       {@code cls}:
   *       <ul>
   *         <li>Test will fail if default value for a parameter cannot be determined.
   *         <li>Test will fail if the factory method returns null so testing instance methods is
   *             impossible.

   * thread safe.
   *
   * <p>The initial state of the builder is such that:
   *
   * <ul>
   *   <li>There are no replacement mappings
   *   <li>{@code safeMin == Character.MIN_VALUE}
   *   <li>{@code safeMax == Character.MAX_VALUE}
   *   <li>{@code unsafeReplacement == null}
   * </ul>
   *
   * <p>For performance reasons escapers created by this builder are not Unicode aware and will not

 *
 * <p>Cache statistics are incremented according to the following rules:
 *
 * <ul>
 *   <li>When a cache lookup encounters an existing cache entry {@code hitCount} is incremented.
 *   <li>When a cache lookup first encounters a missing cache entry, a new entry is loaded.
 *       <ul>
 *         <li>After successfully loading an entry {@code missCount} and {@code loadSuccessCount}