Examples of org.apache.openjpa.kernel.PreparedQueryCache

org.apache.openjpa.kernel.PreparedQueryCache
A cache to create and maintain {@link PreparedQuery prepared queries}. To cache a PreparedQuery is two-stage process. In the first stage, {@link #register(String,Query,FetchConfiguration)} register} an identification key and a compiled Query Q to create a hollow PreparedQuery instance P in the cache. In the second stage, after Q executes, {@link #initialize(String,Object)} initialize} the hollow Prepared Query P from the result of execution such as the target database query PQ and its parameters. After initialization, P can be used with re-parameterization for subsequent execution of the original Query Q. The target database query PQ associated to a cached prepared query P may depend upon query execution context such as fetch plan or lock group. This cache, by design, does not monitor the context or automatically invalidate an entry P when the original query Q is executed with context parameters that affect the target query PQ. The user must notify this receiver to invalidate a cached entry P when execution context changes in a way that will modify the resultant database language query PQ. One of the built-in mechanism (available in JPA facade) is to set query hints to either invalidate the query entirely or ignore the cached version for the current execution. @see QueryHints#HINT_IGNORE_PREPARED_QUERY @see QueryHints#HINT_INVALIDATE_PREPARED_QUERY This cache allows customization of whether a query can be cached or not via either explicit marking of certain keys as non-cachable (which is irreversible or strong) or addition/removal of exclusion patterns (which is reversible or weak). @see #markUncachable(String) @see #addExclusionPattern(String) @see #setExcludes(String) @see #removeExclusionPattern(String) @author Pinaki Poddar @since 2.0.0

        assertNotNull(getPreparedQueryCache() + ": " + getPreparedQueryCache().getMapView() + 
                " does not contain " + id, cached);
    }
    
    void assertNotCached(String id) {
        PreparedQueryCache cache = getPreparedQueryCache();
        if (cache != null) {
            assertNull(cache.get(id));
        }
    }

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     * Gets the prepared query cached by the given key. 
     * 
     * @return the cached PreparedQuery or null if none exists.
     */
    PreparedQuery getPreparedQuery(String id) {
        PreparedQueryCache cache = getPreparedQueryCache();
        return (cache == null) ? null : cache.get(id);
    }

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     * 
     * @return true if this invocation caused the query being registered in the
     * cache. 
     */
    private boolean preExecute(Map params) {
        PreparedQueryCache cache = _em.getPreparedQueryCache();
        if (cache == null) {
            return false;
        }
        FetchConfiguration fetch = _query.getFetchConfiguration();
        if (fetch.getReadLockLevel() != 0) {
            if (cache.get(_id) != null) {
                ignorePreparedQuery();
            }
            return false;
        }
        Boolean registered = cache.register(_id, _query, fetch);
        boolean alreadyCached = (registered == null);
        String lang = _query.getLanguage();
        QueryStatistics<String> stats = cache.getStatistics();
        if (alreadyCached && LANG_PREPARED_SQL.equals(lang)) {
            PreparedQuery pq = _em.getPreparedQuery(_id);
            if (pq.isInitialized()) {
                try {
                    Map rep = pq.reparametrize(params, _em.getBroker());

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     * @param result an opaque object representing execution result of a query
     * 
     * @return true if the prepared query can be initialized.
     */
    private boolean postExecute(Object result) {
        PreparedQueryCache cache = _em.getPreparedQueryCache();
        if (cache == null) {
            return false;
        }
        return cache.initialize(_id, result) != null;
    }

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    /**
     * Remove this query from PreparedQueryCache. 
     */
    boolean invalidatePreparedQuery() {
        PreparedQueryCache cache = _em.getPreparedQueryCache();
        if (cache == null)
            return false;
        ignorePreparedQuery();
        return cache.invalidate(_id);
    }

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     * Gets the prepared query cached by the given key. 
     * 
     * @return the cached PreparedQuery or null if none exists.
     */
    PreparedQuery getPreparedQuery(String id) {
        PreparedQueryCache cache = getPreparedQueryCache();
        return (cache == null) ? null : cache.get(id);
    }

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    @Override
    public void initialize() {
        
        OpenJPAConfiguration conf = (OpenJPAConfiguration)getProvider().getConfiguration();
        PreparedQueryCache pqc = conf.getQuerySQLCacheInstance();
        
        if (pqc == null) {
            throw new UserException(_loc.get("prep-query-cache-not-found"));
        }

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  public void testPreparedQueryCacheIsActiveByDefault() {
    assertNotNull(getPreparedQueryCache());
  }
  
  public void testPreparedQueryCacheIsPerUnitSingleton() {
    PreparedQueryCache c1 = getPreparedQueryCache();
    PreparedQueryCache c2 = getPreparedQueryCache();
    assertSame(c1, c2);
  }

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    assertNotNull(getPreparedQueryCache() + ": " + getPreparedQueryCache().getMapView() + 
        " does not contain " + id, cached);
  }
  
  void assertNotCached(String id) {
      PreparedQueryCache cache = getPreparedQueryCache();
    if (cache != null) {
      assertNull(cache.get(id));
    }
  }

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     * Gets the prepared query cached by the given key. 
     * 
     * @return the cached PreparedQuery or null if none exists.
     */
    PreparedQuery getPreparedQuery(String id) {
        PreparedQueryCache cache = getPreparedQueryCache();
        return (cache == null) ? null : cache.get(id);
    }

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