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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
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/*
 * 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.internal.connection;

import com.mongodb.RequestContext;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.connection.ServerDescription;
import com.mongodb.event.ConnectionCreatedEvent;
import com.mongodb.internal.async.SingleResultCallback;
import com.mongodb.internal.diagnostics.logging.Logger;
import com.mongodb.internal.diagnostics.logging.Loggers;
import com.mongodb.internal.session.SessionContext;
import org.bson.ByteBuf;
import org.bson.codecs.Decoder;

import java.util.List;

import static com.mongodb.assertions.Assertions.assertNotNull;
import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;

/**
 * A connection that tracks when it was opened and when it was last used.
 */
class UsageTrackingInternalConnection implements InternalConnection {
    private static final Logger LOGGER = Loggers.getLogger("connection");
    private volatile long openedAt;
    private volatile long lastUsedAt;
    private volatile boolean closeSilently;
    private final InternalConnection wrapped;
    private final DefaultConnectionPool.ServiceStateManager serviceStateManager;

    UsageTrackingInternalConnection(final InternalConnection wrapped, final DefaultConnectionPool.ServiceStateManager serviceStateManager) {
        this.wrapped = wrapped;
        this.serviceStateManager = serviceStateManager;
        openedAt = Long.MAX_VALUE;
        lastUsedAt = openedAt;
    }

    @Override
    public void open() {
        wrapped.open();
        openedAt = System.currentTimeMillis();
        lastUsedAt = openedAt;
        if (getDescription().getServiceId() != null) {
            serviceStateManager.addConnection(assertNotNull(getDescription().getServiceId()));
        }
    }

    @Override
    public void openAsync(final SingleResultCallback callback) {
        wrapped.openAsync((result, t) -> {
            if (t != null) {
                callback.onResult(null, t);
            } else {
                openedAt = System.currentTimeMillis();
                lastUsedAt = openedAt;
                if (getDescription().getServiceId() != null) {
                    serviceStateManager.addConnection(getDescription().getServiceId());
                }
                callback.onResult(null, null);
            }
        });
    }

    @Override
    public void close() {
        try {
            wrapped.close();
        } finally {
            if (openedAt != Long.MAX_VALUE && getDescription().getServiceId() != null) {
                serviceStateManager.removeConnection(assertNotNull(getDescription().getServiceId()));
            }
        }
    }

    @Override
    public boolean opened() {
        return wrapped.opened();
    }

    @Override
    public boolean isClosed() {
        return wrapped.isClosed();
    }

    @Override
    public ByteBuf getBuffer(final int size) {
        return wrapped.getBuffer(size);
    }

    @Override
    public void sendMessage(final List byteBuffers, final int lastRequestId) {
        wrapped.sendMessage(byteBuffers, lastRequestId);
        lastUsedAt = System.currentTimeMillis();
    }

    @Override
    public  T sendAndReceive(final CommandMessage message, final Decoder decoder, final SessionContext sessionContext,
                                final RequestContext requestContext, final OperationContext operationContext) {
        T result = wrapped.sendAndReceive(message, decoder, sessionContext, requestContext, operationContext);
        lastUsedAt = System.currentTimeMillis();
        return result;
    }

    @Override
    public  void send(final CommandMessage message, final Decoder decoder, final SessionContext sessionContext) {
        wrapped.send(message, decoder, sessionContext);
        lastUsedAt = System.currentTimeMillis();
    }

    @Override
    public  T receive(final Decoder decoder, final SessionContext sessionContext) {
        T result = wrapped.receive(decoder, sessionContext);
        lastUsedAt = System.currentTimeMillis();
        return result;
    }

    @Override
    public  T receive(final Decoder decoder, final SessionContext sessionContext, final int additionalTimeout) {
        T result = wrapped.receive(decoder, sessionContext, additionalTimeout);
        lastUsedAt = System.currentTimeMillis();
        return result;
    }

    @Override
    public boolean hasMoreToCome() {
        return wrapped.hasMoreToCome();
    }

    @Override
    public  void sendAndReceiveAsync(final CommandMessage message, final Decoder decoder,
            final SessionContext sessionContext, final RequestContext requestContext, final OperationContext operationContext,
            final SingleResultCallback callback) {
        SingleResultCallback errHandlingCallback = errorHandlingCallback((result, t) -> {
            lastUsedAt = System.currentTimeMillis();
            callback.onResult(result, t);
        }, LOGGER);
        wrapped.sendAndReceiveAsync(message, decoder, sessionContext, requestContext, operationContext, errHandlingCallback);
    }

    @Override
    public ResponseBuffers receiveMessage(final int responseTo) {
        ResponseBuffers responseBuffers = wrapped.receiveMessage(responseTo);
        lastUsedAt = System.currentTimeMillis();
        return responseBuffers;
    }

    @Override
    public void sendMessageAsync(final List byteBuffers, final int lastRequestId, final SingleResultCallback callback) {
        SingleResultCallback errHandlingCallback = errorHandlingCallback((result, t) -> {
            lastUsedAt = System.currentTimeMillis();
            callback.onResult(result, t);
        }, LOGGER);
        wrapped.sendMessageAsync(byteBuffers, lastRequestId, errHandlingCallback);
    }

    @Override
    public void receiveMessageAsync(final int responseTo, final SingleResultCallback callback) {
        SingleResultCallback errHandlingCallback = errorHandlingCallback((result, t) -> {
            lastUsedAt = System.currentTimeMillis();
            callback.onResult(result, t);
        }, LOGGER);
        wrapped.receiveMessageAsync(responseTo, errHandlingCallback);
    }

    @Override
    public ConnectionDescription getDescription() {
        return wrapped.getDescription();
    }

    @Override
    public ServerDescription getInitialServerDescription() {
        return wrapped.getInitialServerDescription();
    }

    @Override
    public int getGeneration() {
        return wrapped.getGeneration();
    }

    /**
     * Returns the time at which this connection was opened, or {@code Long.MAX_VALUE} if it has not yet been opened.
     *
     * @return the time when this connection was opened, in milliseconds since the epoch.
     */
    long getOpenedAt() {
        return openedAt;
    }

    /**
     * Returns the time at which this connection was last used, or {@code Long.MAX_VALUE} if it has not yet been used.
     *
     * @return the time when this connection was last used, in milliseconds since the epoch.
     */
    long getLastUsedAt() {
        return lastUsedAt;
    }

    /**
     * This method must be used if and only if {@link ConnectionCreatedEvent} was not sent for the connection.
     * Must not throw {@link Exception}s.
     *
     * @see #isCloseSilently()
     */
    void setCloseSilently() {
        closeSilently = true;
    }

    /**
     * Must not throw {@link Exception}s.
     *
     * @see #setCloseSilently()
     */
    boolean isCloseSilently() {
        return closeSilently;
    }
}