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/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.config;
import com.hazelcast.cluster.Member;
import com.hazelcast.internal.config.ConfigDataSerializerHook;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.scheduledexecutor.IScheduledExecutorService;
import javax.annotation.Nonnull;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import static com.hazelcast.config.ScheduledExecutorConfig.CapacityPolicy.PER_NODE;
import static com.hazelcast.config.ScheduledExecutorConfig.CapacityPolicy.getById;
import static com.hazelcast.internal.util.Preconditions.checkNotNegative;
import static com.hazelcast.internal.util.Preconditions.checkNotNull;
import static com.hazelcast.internal.util.Preconditions.checkPositive;
/**
* Configuration options for the {@link IScheduledExecutorService}.
*/
public class ScheduledExecutorConfig implements IdentifiedDataSerializable, NamedConfig {
/**
* The number of executor threads per Member for the Executor based on this configuration.
*/
private static final int DEFAULT_POOL_SIZE = 16;
/**
* The number of tasks that can co-exist per scheduler according to the capacity policy.
*/
private static final int DEFAULT_CAPACITY = 100;
/**
* The number of tasks that can co-exist per scheduler per partition.
*/
private static final CapacityPolicy DEFAULT_CAPACITY_POLICY = PER_NODE;
/**
* The number of replicas per task scheduled in each ScheduledExecutor.
*/
private static final int DEFAULT_DURABILITY = 1;
private String name = "default";
private int durability = DEFAULT_DURABILITY;
private int capacity = DEFAULT_CAPACITY;
private CapacityPolicy capacityPolicy = DEFAULT_CAPACITY_POLICY;
private int poolSize = DEFAULT_POOL_SIZE;
private String splitBrainProtectionName;
private MergePolicyConfig mergePolicyConfig = new MergePolicyConfig();
public ScheduledExecutorConfig() {
}
public ScheduledExecutorConfig(String name) {
this.name = name;
}
public ScheduledExecutorConfig(String name, int durability, int capacity, int poolSize) {
this(name, durability, capacity, poolSize, null, new MergePolicyConfig(), DEFAULT_CAPACITY_POLICY);
}
public ScheduledExecutorConfig(String name, int durability, int capacity, int poolSize, String splitBrainProtectionName,
MergePolicyConfig mergePolicyConfig, CapacityPolicy capacityPolicy) {
this.name = name;
this.durability = durability;
this.poolSize = poolSize;
this.capacity = capacity;
this.capacityPolicy = capacityPolicy;
this.splitBrainProtectionName = splitBrainProtectionName;
this.mergePolicyConfig = mergePolicyConfig;
}
public ScheduledExecutorConfig(ScheduledExecutorConfig config) {
this(config.getName(), config.getDurability(), config.getCapacity(), config.getPoolSize(),
config.getSplitBrainProtectionName(), config.getMergePolicyConfig(), config.getCapacityPolicy());
}
/**
* Gets the name of the executor task.
*
* @return the name of the executor task
*/
public String getName() {
return name;
}
/**
* Sets the name of the executor task.
*
* @param name the name of the executor task
* @return this executor config instance
*/
public ScheduledExecutorConfig setName(String name) {
this.name = name;
return this;
}
/**
* Gets the number of executor threads per member for the executor.
*
* @return the number of executor threads per member for the executor
*/
public int getPoolSize() {
return poolSize;
}
/**
* Sets the number of executor threads per member for the executor.
*
* @param poolSize the number of executor threads per member for the executor
* @return this executor config instance
*/
public ScheduledExecutorConfig setPoolSize(int poolSize) {
this.poolSize = checkPositive(poolSize, "Pool size should be greater than 0");
return this;
}
/**
* Gets the durability of the executor
*
* @return the durability of the executor
*/
public int getDurability() {
return durability;
}
/**
* Sets the durability of the executor
* The durability represents the number of replicas that exist in a cluster for any given partition-owned task.
* If this is set to 0 then there is only 1 copy of the task in the cluster, meaning that if the partition owning it, goes
* down then the task is lost.
*
* @param durability the durability of the executor
* @return this executor config instance
*/
public ScheduledExecutorConfig setDurability(int durability) {
this.durability = checkNotNegative(durability, "durability can't be smaller than 0");
return this;
}
/**
* Gets the capacity of the executor
*
* @return the capacity of the executor
*/
public int getCapacity() {
return capacity;
}
/**
* Sets the capacity of the executor
* The capacity represents the maximum number of tasks that a scheduler can have at any given point in time per partition.
* If this is set to 0 then there is no limit
*
* To prevent any undesirable data-loss, capacity is ignored during partition migrations,
* the count is updated accordingly, however the rejection is not enforced.
*
* @param capacity the capacity of the executor
* @return this executor config instance
*/
public ScheduledExecutorConfig setCapacity(int capacity) {
this.capacity = checkNotNegative(capacity, "capacity can't be smaller than 0");
return this;
}
/**
* @return the policy of the capacity setting
*/
public CapacityPolicy getCapacityPolicy() {
return capacityPolicy;
}
/**
* Set the capacity policy for the configured capacity value
*
* To prevent any undesirable data-loss, capacity is ignored during partition migrations,
* the count is updated accordingly, however the rejection is not enforced.
*
* @param capacityPolicy
*/
public ScheduledExecutorConfig setCapacityPolicy(@Nonnull CapacityPolicy capacityPolicy) {
checkNotNull(capacityPolicy);
this.capacityPolicy = capacityPolicy;
return this;
}
/**
* Returns the split brain protection name for operations.
*
* @return the split brain protection name
*/
public String getSplitBrainProtectionName() {
return splitBrainProtectionName;
}
/**
* Sets the split brain protection name for operations.
*
* @param splitBrainProtectionName the split brain protection name
* @return the updated configuration
*/
public ScheduledExecutorConfig setSplitBrainProtectionName(String splitBrainProtectionName) {
this.splitBrainProtectionName = splitBrainProtectionName;
return this;
}
/**
* Gets the {@link MergePolicyConfig} for the scheduler.
*
* @return the {@link MergePolicyConfig} for the scheduler
*/
public MergePolicyConfig getMergePolicyConfig() {
return mergePolicyConfig;
}
/**
* Sets the {@link MergePolicyConfig} for the scheduler.
*
* @return this executor config instance
*/
public ScheduledExecutorConfig setMergePolicyConfig(MergePolicyConfig mergePolicyConfig) {
this.mergePolicyConfig = checkNotNull(mergePolicyConfig, "mergePolicyConfig cannot be null");
return this;
}
@Override
public String toString() {
return "ScheduledExecutorConfig{"
+ "name='" + name + '\''
+ ", durability=" + durability
+ ", poolSize=" + poolSize
+ ", capacity=" + capacity
+ ", capacityPolicy=" + capacityPolicy
+ ", splitBrainProtectionName=" + splitBrainProtectionName
+ ", mergePolicyConfig=" + mergePolicyConfig
+ '}';
}
@Override
public int getFactoryId() {
return ConfigDataSerializerHook.F_ID;
}
@Override
public int getClassId() {
return ConfigDataSerializerHook.SCHEDULED_EXECUTOR_CONFIG;
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeUTF(name);
out.writeInt(durability);
out.writeInt(capacity);
out.writeInt(poolSize);
out.writeUTF(splitBrainProtectionName);
out.writeObject(mergePolicyConfig);
out.writeByte(capacityPolicy.getId());
}
@Override
public void readData(ObjectDataInput in) throws IOException {
name = in.readUTF();
durability = in.readInt();
capacity = in.readInt();
poolSize = in.readInt();
splitBrainProtectionName = in.readUTF();
mergePolicyConfig = in.readObject();
capacityPolicy = getById(in.readByte());
}
@SuppressWarnings({"checkstyle:npathcomplexity"})
@Override
public final boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof ScheduledExecutorConfig)) {
return false;
}
ScheduledExecutorConfig that = (ScheduledExecutorConfig) o;
if (durability != that.durability) {
return false;
}
if (capacity != that.capacity) {
return false;
}
if (capacityPolicy != that.capacityPolicy) {
return false;
}
if (poolSize != that.poolSize) {
return false;
}
if (splitBrainProtectionName != null ? !splitBrainProtectionName.equals(that.splitBrainProtectionName)
: that.splitBrainProtectionName != null) {
return false;
}
if (mergePolicyConfig != null ? !mergePolicyConfig.equals(that.mergePolicyConfig) : that.mergePolicyConfig != null) {
return false;
}
return name.equals(that.name);
}
@Override
public final int hashCode() {
int result = name.hashCode();
result = 31 * result + durability;
result = 31 * result + capacity;
result = 31 * result + capacityPolicy.hashCode();
result = 31 * result + poolSize;
result = 31 * result + (splitBrainProtectionName != null ? splitBrainProtectionName.hashCode() : 0);
result = 31 * result + (mergePolicyConfig != null ? mergePolicyConfig.hashCode() : 0);
return result;
}
/**
* Capacity policy options
*/
public enum CapacityPolicy {
/**
* Capacity policy that counts tasks per Hazelcast instance node/member,
* and rejects new ones when {@link #capacity} value is reached
*/
PER_NODE((byte) 0),
/**
* Capacity policy that counts tasks per partition, and rejects new ones when {@link #capacity} value is reached.
* Storage size depends on the partition count in a Hazelcast instance.
* This policy should not be used often.
* Avoid using this policy with a small cluster: if the cluster is small it will
* be hosting more partitions, and therefore tasks, than that of a larger cluster.
*
* This policy has no effect when scheduling is done using the OnMember APIs
* eg. {@link IScheduledExecutorService#scheduleOnMember(Runnable, Member, long, TimeUnit)}
*/
PER_PARTITION((byte) 1);
/**
* Unique identifier for a policy, can be used for de/serialization purposes
*/
private final byte id;
CapacityPolicy(byte id) {
this.id = id;
}
public byte getId() {
return id;
}
public static CapacityPolicy getById(final byte id) {
for (CapacityPolicy policy : values()) {
if (policy.id == id) {
return policy;
}
}
return null;
}
}
}
