/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.cache;

import java.util.Properties;

import org.apache.geode.cache.partition.PartitionListener;
import org.apache.geode.internal.cache.PartitionAttributesImpl;
import org.apache.geode.internal.i18n.LocalizedStrings;

/**
 * <p>
 * A factory that creates instances of {@link PartitionAttributes} which are used to create a
 * partitioned {@link Region}. The setter methods follow the self-return idiom so that they can be
 * "chained" together with the {@link #create} method to create {@link PartitionAttributes}. For
 * example:<br>
 *
 * <pre>
 * PartitionAttributes pa =
 *     new PartitionAttributesFactory().setRedundantCopies(1).setLocalMaxMemory(1240).create();
 *
 * final Region myRegion = new RegionFactory().setPartitionAttributes(pa)
 *     .setKeyConstraint(String.class).setValueConstraint(ArrayList.class).create("myRegion");
 * </pre>
 *
 * </p>
 *
 * <p>
 * {@link PartitionAttributes} can also be defined in a declarative fashion using a
 * <a href="package-summary.html#declarative">cache.xml</a> file. Here is an example of how to
 * configure a Partitioned Region named "pRoot" whose {@link org.apache.geode.cache.Scope} is
 * Distributed Ack, which maintains a {@link #setRedundantCopies(int) redundant copy} of any given
 * {@link org.apache.geode.cache.Region.Entry}, configures a
 * {@link org.apache.geode.cache.CacheLoader} implementation, and sets
 * {@link #setGlobalProperties(Properties) global properties} as well as
 * {@link #setLocalMaxMemory(int) local max memory to use}.
 *
 * <pre>
 *    &lt;root-region name=&quot;pRoot&quot;&gt;
 *      &lt;region-attributes scope=&quot;distributed-ack&quot; &gt;
 *        &lt;partition-attributes redundant-copies=&quot;1&quot;,&nbsp;local-max-memory=&quot;1240&quot;/&gt;
 *      &lt;/region-attributes&gt;
 *    &lt;/root-region&gt;
 * </pre>
 * </p>
 *
 * @see org.apache.geode.cache.PartitionAttributes
 * @see org.apache.geode.cache.AttributesFactory#setPartitionAttributes(PartitionAttributes)
 * @since GemFire 5.0
 */
public class PartitionAttributesFactory<K, V> {
  private final PartitionAttributesImpl partitionAttributes = new PartitionAttributesImpl();

  /**
   * @deprecated - please use the {@link #setLocalMaxMemory(int)} method instead.
   *             <p>
   *             The {@link #setLocalProperties(Properties) local property} name that sets the
   *             maximum heap storage a VM contributes to a partitioned Region. When set to zero,
   *             the resulting Region reference allows access to the partitioned Region without any
   *             consuming any heap storage.
   */
  public static final String LOCAL_MAX_MEMORY_PROPERTY = "LOCAL_MAX_MEMORY";

  /**
   * Default local max memory value in megabytes. By default each partitioned Region can contribute
   * 90% of the maximum memory allocated to a VM.
   */
  static int computeMaxMem() {
    final long maxMemInMegabytes = Runtime.getRuntime().maxMemory() / (1024 * 1024);
    final long maxMemoryToUse = (long) (maxMemInMegabytes * 0.90);
    int ret;
    if (maxMemoryToUse < Integer.MAX_VALUE) {
      ret = (int) maxMemoryToUse;
      if (ret < 1) {
        ret = 1;
      }
    } else {
      ret = Integer.MAX_VALUE;
    }
    return ret;
  }

  /**
   * The default maximum amount of memory to be used by this region in this process, in megabytes.
   *
   * @deprecated Use {@link PartitionAttributesImpl#getLocalMaxMemoryDefault()} instead.
   */
  @Deprecated
  public static final int LOCAL_MAX_MEMORY_DEFAULT = computeMaxMem();

  /**
   * @deprecated - use {@link #setTotalMaxMemory(long)} instead.
   *             <p>
   *             The {@link #setGlobalProperties(Properties) global property} name that defines the
   *             total maximum size for the partitioned Region.
   *             <p>
   *             <em>This setting must be the same in all processes using the Region.</em>
   */
  public static final String GLOBAL_MAX_MEMORY_PROPERTY = "GLOBAL_MAX_MEMORY";

  /**
   * Default maximum total size of the region across all processes, in megabytes.
   */
  public static final long GLOBAL_MAX_MEMORY_DEFAULT = Integer.MAX_VALUE;

  /**
   * @deprecated - please use {@link #setTotalNumBuckets(int)} instead.
   *             <p>
   *             <em>This setting must be the same in all processes using the Region.</em>
   */
  public static final String GLOBAL_MAX_BUCKETS_PROPERTY = "GLOBAL_MAX_BUCKETS";

  /**
   * The default total number of buckets (113).
   */
  public static final int GLOBAL_MAX_BUCKETS_DEFAULT = 113;

  public static final long RECOVERY_DELAY_DEFAULT = -1;

  public static final long STARTUP_RECOVERY_DELAY_DEFAULT = 0;

  /**
   * Creates a new instance of PartitionAttributesFactory ready to create a
   * <code>PartitionAttributes</code> with default settings.
   */
  public PartitionAttributesFactory() {}

  /**
   * Creates a new instance of PartitionAttributesFactory ready to create a
   * {@link PartitionAttributes} with the same settings as those in the specified
   * {@link PartitionAttributes}
   *
   * @param pa the <code>PartitionAttributes</code> used to initialize this
   *        PartitionAttributesFactory
   */
  public PartitionAttributesFactory(PartitionAttributes pa) {
    this.partitionAttributes.setAll(pa);

  }

  // CALLBACKS

  /**
   * Sets the number of extra copies of buckets desired. Extra copies allow for both high
   * availability in the face of VM departure (intended or unintended) and and load balancing read
   * operations.
   * <p>
   * <em>This setting must be the same in all processes using the Region.</em> Default number of
   * redundant copies is 0.
   *
   * @param redundantCopies the number of redundant bucket copies, limited to values 0, 1, 2 and 3.
   *
   * @return this
   */
  public PartitionAttributesFactory<K, V> setRedundantCopies(int redundantCopies) {
    this.partitionAttributes.setRedundantCopies(redundantCopies);
    return this;
  }

  /**
   * Sets the cache writer for the next <code>PartitionAttributes</code> created. <i>Currently
   * unsupported for the early access release.</i>
   *
   * @param cacheWriter the cache writer or null if no cache writer
   * @return this public PartitionAttributesFactory<K,V> setCacheWriter(CacheWriter cacheWriter) {
   *         this.partitionAttributes.setCacheWriter(cacheWriter); return this; }
   */

  /**
   * Sets the maximum amount of memory, in megabytes, to be used by the region in this process. If
   * not set, a default of 90% of available heap is used.
   */
  public PartitionAttributesFactory<K, V> setLocalMaxMemory(int mb) {
    this.partitionAttributes.setLocalMaxMemory(mb);
    return this;
  }

  /**
   * Sets the maximum amount of memory, in megabytes, to be used by the region in all processes.
   * <p>
   * <em>This setting must be the same in all processes using the Region.</em> The default value is
   * Integer.MAX_VALUE.
   *
   * @deprecated since Geode 1.3.0
   */
  @Deprecated
  public PartitionAttributesFactory<K, V> setTotalMaxMemory(long mb) {
    this.partitionAttributes.setTotalMaxMemory(mb);
    return this;
  }

  /**
   * Sets the total number of hash buckets to be used by the region in all processes.
   * <p>
   * <em>This setting must be the same in all processes using the Region.</em>
   * <p>
   * A bucket is the smallest unit of data management in a partitioned region.
   * {@link org.apache.geode.cache.Region.Entry Entries} are stored in buckets and buckets may move
   * from one VM to another. Buckets may also have copies, depending on
   * {@link #setRedundantCopies(int) redundancy} to provide high availability in the face of VM
   * failure.
   * </p>
   * <p>
   * The number of buckets should be prime and as a rough guide at the least four times the number
   * of partition VMs. However, there is significant overhead to managing a bucket, particularly for
   * higher values of {@link #setRedundantCopies(int) redundancy}.
   * </p>
   * The default number of buckets for a PartitionedRegion is 113.
   */
  public PartitionAttributesFactory<K, V> setTotalNumBuckets(int numBuckets) {
    this.partitionAttributes.setTotalNumBuckets(numBuckets);
    return this;
  }

  /**
   * Sets the <code>PartitionResolver</code> for the PartitionRegion.
   */
  public PartitionAttributesFactory<K, V> setPartitionResolver(PartitionResolver<K, V> resolver) {
    this.partitionAttributes.setPartitionResolver(resolver);
    return this;
  }

  /**
   * Sets the name of the PartitionRegion with which this newly created partitioned region is
   * colocated
   */
  public PartitionAttributesFactory<K, V> setColocatedWith(String colocatedRegionFullPath) {
    this.partitionAttributes.setColocatedWith(colocatedRegionFullPath);
    return this;
  }

  /**
   * Sets the delay in milliseconds that existing members will wait before satisfying redundancy
   * after another member crashes. Default value is set to -1 which indicates that redundancy will
   * not be recovered after a failure.
   *
   * @since GemFire 6.0
   */
  public PartitionAttributesFactory<K, V> setRecoveryDelay(long recoveryDelay) {
    this.partitionAttributes.setRecoveryDelay(recoveryDelay);
    return this;
  }

  /**
   * Sets the delay in milliseconds that new members will wait before satisfying redundancy. -1
   * indicates that adding new members will not trigger redundancy recovery. The default (set to 0)
   * is to recover redundancy immediately when a new member is added.
   *
   * @since GemFire 6.0
   */
  public PartitionAttributesFactory<K, V> setStartupRecoveryDelay(long startupRecoveryDelay) {
    this.partitionAttributes.setStartupRecoveryDelay(startupRecoveryDelay);
    return this;
  }

  /**
   * adds a PartitionListener for the partitioned region.
   *
   * @param listener
   * @return PartitionAttributeFactory
   * @since GemFire 6.5
   */
  public PartitionAttributesFactory<K, V> addPartitionListener(PartitionListener listener) {
    if (listener == null) {
      throw new IllegalArgumentException(
          LocalizedStrings.PartitionAttributesFactory_PARTITION_LISTENER_PARAMETER_WAS_NULL
              .toLocalizedString());
    }
    synchronized (this.partitionAttributes) {
      this.partitionAttributes.addPartitionListener(listener);
    }
    return this;
  }

  /**
   * Sets the <code>Properties</code> for the local instance the partitioned Region. Local
   * properties define how the local instance of the partitioned region and any storage it may
   * provide, behaves. There are currently no non-deprecated local properties.
   *
   * @deprecated use {@link #setLocalMaxMemory(int)} in GemFire 5.1 and later releases
   * @param localProps
   * @return PartitionAttributeFactory.
   *
   */
  @Deprecated
  public PartitionAttributesFactory<K, V> setLocalProperties(Properties localProps) {
    if (localProps == null) {
      return this;
    }
    this.partitionAttributes.setLocalProperties(localProps);

    return this;
  }

  /**
   * Sets the global <code>Properties</code> for the next <code>PartitionAttributes</code> created.
   * Global properties define how the entire partitioned Region behaves.
   * <p>
   * Note that global settings must be the same in all processes using the Region.
   *
   * @deprecated use {@link #setTotalMaxMemory(long)} and {@link #setTotalNumBuckets(int)} in
   *             GemFire 5.1 and later releases
   * @param globalProps
   * @return PartitionAttributeFactory.
   *
   * @see #GLOBAL_MAX_MEMORY_PROPERTY
   */
  @Deprecated
  public PartitionAttributesFactory<K, V> setGlobalProperties(Properties globalProps) {
    this.partitionAttributes.setGlobalProperties(globalProps);
    return this;
  }

  /**
   * FixedPartitionAttributes defined for this partitioned region is added to PR attributes.
   *
   * @since GemFire 6.6
   */
  public PartitionAttributesFactory<K, V> addFixedPartitionAttributes(
      FixedPartitionAttributes fpa) {
    synchronized (this.partitionAttributes) {
      this.partitionAttributes.addFixedPartitionAttributes(fpa);
      return this;
    }
  }

  /**
   * Creates a <code>PartitionAttributes</code> with the current settings.
   *
   * @return the newly created <code>PartitionAttributes</code>
   * @throws IllegalStateException if the current settings violate the
   *         <a href="#compatibility">compatibility rules </a>
   */
  @SuppressWarnings("unchecked")
  public PartitionAttributes<K, V> create() {
    this.partitionAttributes.validateAttributes();
    // defaults are set in the PartitionedRegion when the attributes are applied
    return (PartitionAttributes<K, V>) this.partitionAttributes.clone();
  }
}
