Java tutorial
/* * * 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.qpid.server.model.adapter; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.UUID; import com.google.common.base.Supplier; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import org.apache.qpid.server.logging.EventLogger; import org.apache.qpid.server.logging.messages.ChannelMessages; import org.apache.qpid.server.model.AbstractConfiguredObject; import org.apache.qpid.server.model.Consumer; import org.apache.qpid.server.model.LifetimePolicy; import org.apache.qpid.server.model.NamedAddressSpace; import org.apache.qpid.server.model.Session; import org.apache.qpid.server.model.State; import org.apache.qpid.server.model.StateTransition; import org.apache.qpid.server.protocol.AMQSessionModel; import org.apache.qpid.server.protocol.ConsumerListener; import org.apache.qpid.server.transport.AbstractAMQPConnection; import org.apache.qpid.server.transport.TransactionTimeoutTicker; import org.apache.qpid.server.util.Action; import org.apache.qpid.server.virtualhost.QueueManagingVirtualHost; import org.apache.qpid.transport.network.Ticker; public final class SessionAdapter extends AbstractConfiguredObject<SessionAdapter> implements Session<SessionAdapter> { private static final String OPEN_TRANSACTION_TIMEOUT_ERROR = "Open transaction timed out"; private static final String IDLE_TRANSACTION_TIMEOUT_ERROR = "Idle transaction timed out"; // Attributes private final AMQSessionModel _session; private final Action _deleteModelTask; private final AbstractAMQPConnection<?, ?> _amqpConnection; public SessionAdapter(final AbstractAMQPConnection<?, ?> amqpConnection, final AMQSessionModel<?, ?> session) { super(amqpConnection, createAttributes(session)); _amqpConnection = amqpConnection; _session = session; _session.addConsumerListener(new ConsumerListener() { @Override public void consumerAdded(final Consumer<?, ?> consumer) { childAdded(consumer); } @Override public void consumerRemoved(final Consumer<?, ?> consumer) { childRemoved(consumer); } }); session.setModelObject(this); _deleteModelTask = new Action() { @Override public void performAction(final Object object) { session.removeDeleteTask(this); deleteAsync(); } }; session.addDeleteTask(_deleteModelTask); setState(State.ACTIVE); } private static Map<String, Object> createAttributes(final AMQSessionModel session) { Map<String, Object> attributes = new HashMap<>(); attributes.put(ID, UUID.randomUUID()); attributes.put(NAME, String.valueOf(session.getChannelId())); attributes.put(DURABLE, false); attributes.put(LIFETIME_POLICY, LifetimePolicy.DELETE_ON_SESSION_END); return attributes; } @Override protected void postResolveChildren() { super.postResolveChildren(); registerTransactionTimeoutTickers(_amqpConnection, _session); } @Override public int getChannelId() { return _session.getChannelId(); } @Override public boolean isProducerFlowBlocked() { return _session.getBlocking(); } public Collection<org.apache.qpid.server.model.Consumer> getConsumers() { return (Collection<Consumer>) _session.getConsumers(); } @Override public long getConsumerCount() { return _session.getConsumerCount(); } @Override public long getLocalTransactionBegins() { return _session.getTxnStart(); } @Override public int getLocalTransactionOpen() { long open = _session.getTxnStart() - (_session.getTxnCommits() + _session.getTxnRejects()); return (open > 0l) ? 1 : 0; } @Override public long getLocalTransactionRollbacks() { return _session.getTxnRejects(); } @Override public long getUnacknowledgedMessages() { return _session.getUnacknowledgedMessageCount(); } @Override public Date getTransactionStartTime() { return new Date(_session.getTransactionStartTime()); } @Override public Date getTransactionUpdateTime() { return new Date(_session.getTransactionUpdateTime()); } @StateTransition(currentState = State.ACTIVE, desiredState = State.DELETED) private ListenableFuture<Void> doDelete() { deleted(); setState(State.DELETED); _session.removeDeleteTask(_deleteModelTask); return Futures.immediateFuture(null); } private void registerTransactionTimeoutTickers(AbstractAMQPConnection<?, ?> amqpConnection, final AMQSessionModel session) { NamedAddressSpace addressSpace = amqpConnection.getAddressSpace(); if (addressSpace instanceof QueueManagingVirtualHost) { final EventLogger eventLogger = amqpConnection.getEventLogger(); final QueueManagingVirtualHost<?> virtualhost = (QueueManagingVirtualHost<?>) addressSpace; final List<Ticker> tickers = new ArrayList<>(4); final Supplier<Long> transactionStartTimeSupplier = new Supplier<Long>() { @Override public Long get() { return SessionAdapter.this._session.getTransactionStartTime(); } }; final Supplier<Long> transactionUpdateTimeSupplier = new Supplier<Long>() { @Override public Long get() { return SessionAdapter.this._session.getTransactionUpdateTime(); } }; long notificationRepeatPeriod = getContextValue(Long.class, Session.TRANSACTION_TIMEOUT_NOTIFICATION_REPEAT_PERIOD); if (virtualhost.getStoreTransactionOpenTimeoutWarn() > 0) { tickers.add(new TransactionTimeoutTicker(virtualhost.getStoreTransactionOpenTimeoutWarn(), notificationRepeatPeriod, transactionStartTimeSupplier, new Action<Long>() { @Override public void performAction(Long age) { eventLogger.message(_session.getLogSubject(), ChannelMessages.OPEN_TXN(age)); } })); } if (virtualhost.getStoreTransactionOpenTimeoutClose() > 0) { tickers.add(new TransactionTimeoutTicker(virtualhost.getStoreTransactionOpenTimeoutClose(), notificationRepeatPeriod, transactionStartTimeSupplier, new Action<Long>() { @Override public void performAction(Long age) { _session.doTimeoutAction(OPEN_TRANSACTION_TIMEOUT_ERROR); } })); } if (virtualhost.getStoreTransactionIdleTimeoutWarn() > 0) { tickers.add(new TransactionTimeoutTicker(virtualhost.getStoreTransactionIdleTimeoutWarn(), notificationRepeatPeriod, transactionUpdateTimeSupplier, new Action<Long>() { @Override public void performAction(Long age) { eventLogger.message(_session.getLogSubject(), ChannelMessages.IDLE_TXN(age)); } })); } if (virtualhost.getStoreTransactionIdleTimeoutClose() > 0) { tickers.add(new TransactionTimeoutTicker(virtualhost.getStoreTransactionIdleTimeoutClose(), notificationRepeatPeriod, transactionUpdateTimeSupplier, new Action<Long>() { @Override public void performAction(Long age) { _session.doTimeoutAction(IDLE_TRANSACTION_TIMEOUT_ERROR); } })); } for (Ticker ticker : tickers) { session.addTicker(ticker); } Action deleteTickerTask = new Action() { @Override public void performAction(Object o) { session.removeDeleteTask(this); for (Ticker ticker : tickers) { session.removeTicker(ticker); } } }; session.addDeleteTask(deleteTickerTask); } } @Override protected void logOperation(final String operation) { _amqpConnection.getEventLogger().message(ChannelMessages.OPERATION(operation)); } }