private PooledObject create()

in src/main/java/org/apache/commons/pool3/impl/GenericKeyedObjectPool.java [720:822]
77 lines of code
17 McCabe index (conditional complexity)

    private PooledObject<T> create(final K key) throws E {
        int maxTotalPerKeySave = getMaxTotalPerKey(); // Per key
        if (maxTotalPerKeySave < 0) {
            maxTotalPerKeySave = Integer.MAX_VALUE;
        }
        final int maxTotal = getMaxTotal();   // All keys

        final ObjectDeque<T> objectDeque = poolMap.get(key);

        // Check against the overall limit
        boolean loop = true;

        while (loop) {
            final int newNumTotal = numTotal.incrementAndGet();
            if (maxTotal > -1 && newNumTotal > maxTotal) {
                numTotal.decrementAndGet();
                if (getNumIdle() == 0) {
                    return null;
                }
                clearOldest();
            } else {
                loop = false;
            }
        }

        // Flag that indicates if create should:
        // - TRUE:  call the factory to create an object
        // - FALSE: return null
        // - null:  loop and re-test the condition that determines whether to
        //          call the factory
        Boolean create = null;
        while (create == null) {
            synchronized (objectDeque.makeObjectCountLock) {
                final long newCreateCount = objectDeque.getCreateCount().incrementAndGet();
                // Check against the per key limit
                if (newCreateCount > maxTotalPerKeySave) {
                    // The key is currently at capacity or in the process of
                    // making enough new objects to take it to capacity.
                    objectDeque.getCreateCount().decrementAndGet();
                    if (objectDeque.makeObjectCount == 0) {
                        // There are no makeObject() calls in progress for this
                        // key so the key is at capacity. Do not attempt to
                        // create a new object. Return and wait for an object to
                        // be returned.
                        create = Boolean.FALSE;
                    } else {
                        // There are makeObject() calls in progress that might
                        // bring the pool to capacity. Those calls might also
                        // fail so wait until they complete and then re-test if
                        // the pool is at capacity or not.
                        try {
                            objectDeque.makeObjectCountLock.wait();
                        } catch (final InterruptedException e) {
                            throw cast(e);
                        }
                    }
                } else {
                    // The pool is not at capacity. Create a new object.
                    objectDeque.makeObjectCount++;
                    create = Boolean.TRUE;
                }
            }
        }

        if (!create.booleanValue()) {
            numTotal.decrementAndGet();
            return null;
        }

        PooledObject<T> p = null;
        try {
            p = factory.makeObject(key);
            if (PooledObject.isNull(p)) {
                numTotal.decrementAndGet();
                objectDeque.getCreateCount().decrementAndGet();
                throw new NullPointerException(String.format("%s.makeObject() = null", factory.getClass().getSimpleName()));
            }
            if (getTestOnCreate() && !factory.validateObject(key, p)) {
                numTotal.decrementAndGet();
                objectDeque.getCreateCount().decrementAndGet();
                return null;
            }
        } catch (final Exception e) {
            numTotal.decrementAndGet();
            objectDeque.getCreateCount().decrementAndGet();
            throw e;
        } finally {
            synchronized (objectDeque.makeObjectCountLock) {
                objectDeque.makeObjectCount--;
                objectDeque.makeObjectCountLock.notifyAll();
            }
        }

        final AbandonedConfig ac = this.abandonedConfig;
        if (ac != null && ac.getLogAbandoned()) {
            p.setLogAbandoned(true);
            p.setRequireFullStackTrace(ac.getRequireFullStackTrace());
        }

        createdCount.incrementAndGet();
        objectDeque.getAllObjects().put(IdentityWrapper.on(p), p);
        return p;
    }