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The Java operations layer for the MongoDB Java Driver.
Third parties can wrap this layer to provide custom higher-level APIs
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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.mongodb.connection;
import com.mongodb.ConnectionString;
import com.mongodb.annotations.Immutable;
import com.mongodb.annotations.NotThreadSafe;
import com.mongodb.event.ConnectionCheckOutStartedEvent;
import com.mongodb.event.ConnectionCheckedInEvent;
import com.mongodb.event.ConnectionCheckedOutEvent;
import com.mongodb.event.ConnectionCreatedEvent;
import com.mongodb.event.ConnectionPoolListener;
import com.mongodb.event.ConnectionReadyEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import static com.mongodb.assertions.Assertions.isTrue;
import static com.mongodb.assertions.Assertions.notNull;
import static java.util.Collections.unmodifiableList;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.MINUTES;
/**
* All settings that relate to the pool of connections to a MongoDB server.
*
* @since 3.0
*/
@Immutable
public class ConnectionPoolSettings {
private final List connectionPoolListeners;
private final int maxSize;
private final int minSize;
private final long maxWaitTimeMS;
private final long maxConnectionLifeTimeMS;
private final long maxConnectionIdleTimeMS;
private final long maintenanceInitialDelayMS;
private final long maintenanceFrequencyMS;
private final int maxConnecting;
/**
* Gets a Builder for creating a new ConnectionPoolSettings instance.
*
* @return a new Builder for ConnectionPoolSettings.
*/
public static Builder builder() {
return new Builder();
}
/**
* Gets a Builder for creating a new ConnectionPoolSettings instance.
*
* @param connectionPoolSettings the existing connection pool settings to configure the builder with
* @return a new Builder for ConnectionPoolSettings
* @since 3.5
*/
public static Builder builder(final ConnectionPoolSettings connectionPoolSettings) {
return builder().applySettings(connectionPoolSettings);
}
/**
* A builder for creating ConnectionPoolSettings.
*/
@NotThreadSafe
public static final class Builder {
private List connectionPoolListeners = new ArrayList<>();
private int maxSize = 100;
private int minSize;
private long maxWaitTimeMS = 1000 * 60 * 2;
private long maxConnectionLifeTimeMS;
private long maxConnectionIdleTimeMS;
private long maintenanceInitialDelayMS;
private long maintenanceFrequencyMS = MILLISECONDS.convert(1, MINUTES);
private int maxConnecting = 2;
Builder() {
}
/**
* Applies the connectionPoolSettings to the builder
*
* Note: Overwrites all existing settings
*
* @param connectionPoolSettings the connectionPoolSettings
* @return this
* @since 3.7
*/
public Builder applySettings(final ConnectionPoolSettings connectionPoolSettings) {
notNull("connectionPoolSettings", connectionPoolSettings);
connectionPoolListeners = new ArrayList<>(connectionPoolSettings.connectionPoolListeners);
maxSize = connectionPoolSettings.maxSize;
minSize = connectionPoolSettings.minSize;
maxWaitTimeMS = connectionPoolSettings.maxWaitTimeMS;
maxConnectionLifeTimeMS = connectionPoolSettings.maxConnectionLifeTimeMS;
maxConnectionIdleTimeMS = connectionPoolSettings.maxConnectionIdleTimeMS;
maintenanceInitialDelayMS = connectionPoolSettings.maintenanceInitialDelayMS;
maintenanceFrequencyMS = connectionPoolSettings.maintenanceFrequencyMS;
maxConnecting = connectionPoolSettings.maxConnecting;
return this;
}
/**
* The maximum number of connections allowed. Those connections will be kept in the pool when idle. Once the pool is exhausted,
* any operation requiring a connection will block waiting for an available connection.
*
* Default is 100.
*
* @param maxSize the maximum number of connections in the pool; if 0, then there is no limit.
* @return this
* @see #getMaxSize()
* @see #getMaxWaitTime(TimeUnit)
*/
public Builder maxSize(final int maxSize) {
this.maxSize = maxSize;
return this;
}
/**
* The minimum number of connections. Those connections will be kept in the pool when idle, and the pool will ensure that it
* contains at least this minimum number.
*
* Default is 0.
*
* @param minSize the minimum number of connections to have in the pool at all times.
* @return this
*/
public Builder minSize(final int minSize) {
this.minSize = minSize;
return this;
}
/**
* The maximum duration to wait until either:
*
* -
* an {@linkplain ConnectionCheckedOutEvent in-use connection} becomes {@linkplain ConnectionCheckedInEvent available}; or
*
* -
* a {@linkplain ConnectionCreatedEvent connection is created} and begins to be {@linkplain ConnectionReadyEvent established}.
* The time between {@linkplain ConnectionCheckOutStartedEvent requesting} a connection
* and it being created is limited by this maximum duration.
* The maximum time between it being created and {@linkplain ConnectionCheckedOutEvent successfully checked out},
* which includes the time to {@linkplain ConnectionReadyEvent establish} the created connection,
* is affected by {@link SocketSettings#getConnectTimeout(TimeUnit)}, {@link SocketSettings#getReadTimeout(TimeUnit)}
* among others, and is not affected by this maximum duration.
*
*
* The reasons it is not always possible to create and start establishing a connection
* whenever there is no available connection:
*
* -
* the number of connections per pool is limited by {@link #getMaxSize()};
*
* -
* the number of connections a pool may be establishing concurrently is limited by {@link #getMaxConnecting()}.
*
*
*
* Default is 2 minutes. A value of 0 means that it will not wait. A negative value means it will wait indefinitely.
*
* @param maxWaitTime the maximum amount of time to wait
* @param timeUnit the TimeUnit for this wait period
* @return this
* @see #getMaxWaitTime(TimeUnit)
*/
public Builder maxWaitTime(final long maxWaitTime, final TimeUnit timeUnit) {
this.maxWaitTimeMS = MILLISECONDS.convert(maxWaitTime, timeUnit);
return this;
}
/**
* The maximum time a pooled connection can live for. A zero value indicates no limit to the life time. A pooled connection that
* has exceeded its life time will be closed and replaced when necessary by a new connection.
*
* @param maxConnectionLifeTime the maximum length of time a connection can live
* @param timeUnit the TimeUnit for this time period
* @return this
*/
public Builder maxConnectionLifeTime(final long maxConnectionLifeTime, final TimeUnit timeUnit) {
this.maxConnectionLifeTimeMS = MILLISECONDS.convert(maxConnectionLifeTime, timeUnit);
return this;
}
/**
* The maximum idle time of a pooled connection. A zero value indicates no limit to the idle time. A pooled connection that has
* exceeded its idle time will be closed and replaced when necessary by a new connection.
*
* @param maxConnectionIdleTime the maximum time a connection can be unused
* @param timeUnit the TimeUnit for this time period
* @return this
*/
public Builder maxConnectionIdleTime(final long maxConnectionIdleTime, final TimeUnit timeUnit) {
this.maxConnectionIdleTimeMS = MILLISECONDS.convert(maxConnectionIdleTime, timeUnit);
return this;
}
/**
* The period of time to wait before running the first maintenance job on the connection pool.
*
* @param maintenanceInitialDelay the time period to wait
* @param timeUnit the TimeUnit for this time period
* @return this
*/
public Builder maintenanceInitialDelay(final long maintenanceInitialDelay, final TimeUnit timeUnit) {
this.maintenanceInitialDelayMS = MILLISECONDS.convert(maintenanceInitialDelay, timeUnit);
return this;
}
/**
* The time period between runs of the maintenance job.
*
* @param maintenanceFrequency the time period between runs of the maintenance job
* @param timeUnit the TimeUnit for this time period
* @return this
*/
public Builder maintenanceFrequency(final long maintenanceFrequency, final TimeUnit timeUnit) {
this.maintenanceFrequencyMS = MILLISECONDS.convert(maintenanceFrequency, timeUnit);
return this;
}
/**
* Adds the given connection pool listener.
*
* @param connectionPoolListener the non-null connection pool listener
* @return this
* @since 3.5
*/
public Builder addConnectionPoolListener(final ConnectionPoolListener connectionPoolListener) {
connectionPoolListeners.add(notNull("connectionPoolListener", connectionPoolListener));
return this;
}
/**
* Sets the connection pool listeners.
*
* @param connectionPoolListeners list of connection pool listeners
* @return this
* @since 4.5
*/
public Builder connectionPoolListenerList(final List connectionPoolListeners) {
notNull("connectionPoolListeners", connectionPoolListeners);
this.connectionPoolListeners = new ArrayList<>(connectionPoolListeners);
return this;
}
/**
* The maximum number of connections a pool may be establishing concurrently.
*
* @param maxConnecting The maximum number of connections a pool may be establishing concurrently. Must be positive.
* @return {@code this}.
* @see ConnectionPoolSettings#getMaxConnecting()
* @see #getMaxWaitTime(TimeUnit)
* @since 4.4
*/
public Builder maxConnecting(final int maxConnecting) {
this.maxConnecting = maxConnecting;
return this;
}
/**
* Creates a new ConnectionPoolSettings object with the settings initialised on this builder.
*
* @return a new ConnectionPoolSettings object
*/
public ConnectionPoolSettings build() {
return new ConnectionPoolSettings(this);
}
/**
* Takes the settings from the given {@code ConnectionString} and applies them to the builder
*
* @param connectionString the connection string containing details of how to connect to MongoDB
* @return this
*/
public Builder applyConnectionString(final ConnectionString connectionString) {
Integer maxConnectionPoolSize = connectionString.getMaxConnectionPoolSize();
if (maxConnectionPoolSize != null) {
maxSize(maxConnectionPoolSize);
}
Integer minConnectionPoolSize = connectionString.getMinConnectionPoolSize();
if (minConnectionPoolSize != null) {
minSize(minConnectionPoolSize);
}
Integer maxWaitTime = connectionString.getMaxWaitTime();
if (maxWaitTime != null) {
maxWaitTime(maxWaitTime, MILLISECONDS);
}
Integer maxConnectionIdleTime = connectionString.getMaxConnectionIdleTime();
if (maxConnectionIdleTime != null) {
maxConnectionIdleTime(maxConnectionIdleTime, MILLISECONDS);
}
Integer maxConnectionLifeTime = connectionString.getMaxConnectionLifeTime();
if (maxConnectionLifeTime != null) {
maxConnectionLifeTime(maxConnectionLifeTime, MILLISECONDS);
}
Integer maxConnecting = connectionString.getMaxConnecting();
if (maxConnecting != null) {
maxConnecting(maxConnecting);
}
return this;
}
}
/**
* The maximum number of connections allowed. Those connections will be kept in the pool when idle. Once the pool is exhausted, any
* operation requiring a connection will block waiting for an available connection.
*
* Default is 100.
*
* @return the maximum number of connections in the pool; if 0, then there is no limit.
* @see Builder#maxSize(int)
* @see ConnectionString#getMaxConnectionPoolSize()
* @see #getMaxWaitTime(TimeUnit)
*/
public int getMaxSize() {
return maxSize;
}
/**
* The minimum number of connections. Those connections will be kept in the pool when idle, and the pool will ensure that it contains
* at least this minimum number.
*
* Default is 0.
*
* @return the minimum number of connections to have in the pool at all times.
*/
public int getMinSize() {
return minSize;
}
/**
* The maximum duration to wait until either:
*
* -
* an {@linkplain ConnectionCheckedOutEvent in-use connection} becomes {@linkplain ConnectionCheckedInEvent available}; or
*
* -
* a {@linkplain ConnectionCreatedEvent connection is created} and begins to be {@linkplain ConnectionReadyEvent established}.
* The time between {@linkplain ConnectionCheckOutStartedEvent requesting} a connection
* and it being created is limited by this maximum duration.
* The maximum time between it being created and {@linkplain ConnectionCheckedOutEvent successfully checked out},
* which includes the time to {@linkplain ConnectionReadyEvent establish} the created connection,
* is affected by {@link SocketSettings#getConnectTimeout(TimeUnit)}, {@link SocketSettings#getReadTimeout(TimeUnit)}
* among others, and is not affected by this maximum duration.
*
*
* The reasons it is not always possible to create and start establishing a connection
* whenever there is no available connection:
*
* -
* the number of connections per pool is limited by {@link #getMaxSize()};
*
* -
* the number of connections a pool may be establishing concurrently is limited by {@link #getMaxConnecting()}.
*
*
*
* Default is 2 minutes. A value of 0 means that it will not wait. A negative value means it will wait indefinitely.
*
* @param timeUnit the TimeUnit for this wait period
* @return the maximum amount of time to wait in the given TimeUnits
* @see Builder#maxWaitTime(long, TimeUnit)
* @see ConnectionString#getMaxWaitTime()
*/
public long getMaxWaitTime(final TimeUnit timeUnit) {
return timeUnit.convert(maxWaitTimeMS, MILLISECONDS);
}
/**
* The maximum time a pooled connection can live for. A zero value indicates no limit to the life time. A pooled connection that has
* exceeded its life time will be closed and replaced when necessary by a new connection.
*
* @param timeUnit the TimeUnit to use for this time period
* @return the maximum length of time a connection can live in the given TimeUnits
*/
public long getMaxConnectionLifeTime(final TimeUnit timeUnit) {
return timeUnit.convert(maxConnectionLifeTimeMS, MILLISECONDS);
}
/**
* Returns the maximum idle time of a pooled connection. A zero value indicates no limit to the idle time. A pooled connection that
* has exceeded its idle time will be closed and replaced when necessary by a new connection.
*
* @param timeUnit the TimeUnit to use for this time period
* @return the maximum time a connection can be unused, in the given TimeUnits
*/
public long getMaxConnectionIdleTime(final TimeUnit timeUnit) {
return timeUnit.convert(maxConnectionIdleTimeMS, MILLISECONDS);
}
/**
* Returns the period of time to wait before running the first maintenance job on the connection pool.
*
* @param timeUnit the TimeUnit to use for this time period
* @return the time period to wait in the given units
*/
public long getMaintenanceInitialDelay(final TimeUnit timeUnit) {
return timeUnit.convert(maintenanceInitialDelayMS, MILLISECONDS);
}
/**
* Returns the time period between runs of the maintenance job.
*
* @param timeUnit the TimeUnit to use for this time period
* @return the time period between runs of the maintenance job in the given units
*/
public long getMaintenanceFrequency(final TimeUnit timeUnit) {
return timeUnit.convert(maintenanceFrequencyMS, MILLISECONDS);
}
/**
* Gets the list of added {@code ConnectionPoolListener}. The default is an empty list.
*
* @return the unmodifiable list of connection pool listeners
* @since 3.5
*/
public List getConnectionPoolListeners() {
return connectionPoolListeners;
}
/**
* The maximum number of connections a pool may be establishing concurrently.
* Establishment of a connection is a part of its life cycle
* starting after a {@link ConnectionCreatedEvent} and ending before a {@link ConnectionReadyEvent}.
*
* Default is 2.
*
* @return The maximum number of connections a pool may be establishing concurrently.
* @see Builder#maxConnecting(int)
* @see ConnectionString#getMaxConnecting()
* @see #getMaxWaitTime(TimeUnit)
* @since 4.4
*/
public int getMaxConnecting() {
return maxConnecting;
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ConnectionPoolSettings that = (ConnectionPoolSettings) o;
if (maxConnectionIdleTimeMS != that.maxConnectionIdleTimeMS) {
return false;
}
if (maxConnectionLifeTimeMS != that.maxConnectionLifeTimeMS) {
return false;
}
if (maxSize != that.maxSize) {
return false;
}
if (minSize != that.minSize) {
return false;
}
if (maintenanceInitialDelayMS != that.maintenanceInitialDelayMS) {
return false;
}
if (maintenanceFrequencyMS != that.maintenanceFrequencyMS) {
return false;
}
if (maxWaitTimeMS != that.maxWaitTimeMS) {
return false;
}
if (!connectionPoolListeners.equals(that.connectionPoolListeners)) {
return false;
}
if (maxConnecting != that.maxConnecting) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = maxSize;
result = 31 * result + minSize;
result = 31 * result + (int) (maxWaitTimeMS ^ (maxWaitTimeMS >>> 32));
result = 31 * result + (int) (maxConnectionLifeTimeMS ^ (maxConnectionLifeTimeMS >>> 32));
result = 31 * result + (int) (maxConnectionIdleTimeMS ^ (maxConnectionIdleTimeMS >>> 32));
result = 31 * result + (int) (maintenanceInitialDelayMS ^ (maintenanceInitialDelayMS >>> 32));
result = 31 * result + (int) (maintenanceFrequencyMS ^ (maintenanceFrequencyMS >>> 32));
result = 31 * result + connectionPoolListeners.hashCode();
result = 31 * result + maxConnecting;
return result;
}
@Override
public String toString() {
return "ConnectionPoolSettings{"
+ "maxSize=" + maxSize
+ ", minSize=" + minSize
+ ", maxWaitTimeMS=" + maxWaitTimeMS
+ ", maxConnectionLifeTimeMS=" + maxConnectionLifeTimeMS
+ ", maxConnectionIdleTimeMS=" + maxConnectionIdleTimeMS
+ ", maintenanceInitialDelayMS=" + maintenanceInitialDelayMS
+ ", maintenanceFrequencyMS=" + maintenanceFrequencyMS
+ ", connectionPoolListeners=" + connectionPoolListeners
+ ", maxConnecting=" + maxConnecting
+ '}';
}
ConnectionPoolSettings(final Builder builder) {
isTrue("maxSize >= 0", builder.maxSize >= 0);
isTrue("minSize >= 0", builder.minSize >= 0);
isTrue("maintenanceInitialDelayMS >= 0", builder.maintenanceInitialDelayMS >= 0);
isTrue("maxConnectionLifeTime >= 0", builder.maxConnectionLifeTimeMS >= 0);
isTrue("maxConnectionIdleTime >= 0", builder.maxConnectionIdleTimeMS >= 0);
isTrue("sizeMaintenanceFrequency > 0", builder.maintenanceFrequencyMS > 0);
isTrue("maxSize >= minSize", builder.maxSize >= builder.minSize);
isTrue("maxConnecting > 0", builder.maxConnecting > 0);
maxSize = builder.maxSize;
minSize = builder.minSize;
maxWaitTimeMS = builder.maxWaitTimeMS;
maxConnectionLifeTimeMS = builder.maxConnectionLifeTimeMS;
maxConnectionIdleTimeMS = builder.maxConnectionIdleTimeMS;
maintenanceInitialDelayMS = builder.maintenanceInitialDelayMS;
maintenanceFrequencyMS = builder.maintenanceFrequencyMS;
connectionPoolListeners = unmodifiableList(builder.connectionPoolListeners);
maxConnecting = builder.maxConnecting;
}
}
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