Examples of org.apache.activemq.store.PersistenceAdapter.beginTransaction()

Class org.apache.activemq.store.PersistenceAdapter

Examples of org.apache.activemq.store.PersistenceAdapter.beginTransaction()

org.apache.activemq.store.PersistenceAdapter.beginTransaction()
This method starts a transaction on the persistent storage - which is nothing to do with JMS or XA transactions - its purely a mechanism to perform multiple writes to a persistent store in 1 transaction as a performance optimization.
Typically one transaction will require one disk synchronization point and so for real high performance its usually faster to perform many writes within the same transaction to minimize latency caused by disk synchronization. This is especially true when using tools like Berkeley Db or embedded JDBC servers. @param context @throws IOException

                        size += message.getSize();
                        message.decrementReferenceCount();
                        // Commit the batch if it's getting too big
                        if (size >= maxCheckpointMessageAddSize) {
                            persitanceAdapter.commitTransaction(context);
                            persitanceAdapter.beginTransaction(context);
                            size = 0;
                        }
                    }
                }

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                        }
                    }
                }


                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);


                // Checkpoint the removed messages.
                Iterator<MessageAck> iterator = cpRemovedMessageLocations.iterator();
                while (iterator.hasNext()) {
                    try {

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                    }
                    size++;
                    // Commit the batch if it's getting too big
                    if (size >= maxCheckpointMessageAddSize) {
                        persitanceAdapter.commitTransaction(context);
                        persitanceAdapter.beginTransaction(context);
                        size = 0;
                    }
                }
                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);

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                        persitanceAdapter.beginTransaction(context);
                        size = 0;
                    }
                }
                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);
                // Checkpoint the removed messages.
                for (MessageAck ack : cpRemovedMessageLocations) {
                    try {
                        referenceStore.removeMessage(transactionTemplate.getContext(), ack);
                    } catch (Throwable e) {

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                    }
                    size++;
                    // Commit the batch if it's getting too big
                    if (size >= maxCheckpointMessageAddSize) {
                        persitanceAdapter.commitTransaction(context);
                        persitanceAdapter.beginTransaction(context);
                        size = 0;
                    }
                }
                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);

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                        persitanceAdapter.beginTransaction(context);
                        size = 0;
                    }
                }
                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);
                // Checkpoint the removed messages.
                for (MessageAck ack : cpRemovedMessageLocations) {
                    try {
                        referenceStore.removeMessage(transactionTemplate.getContext(), ack);
                    } catch (Throwable e) {

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                        size += message.getSize();
                        message.decrementReferenceCount();
                        // Commit the batch if it's getting too big
                        if (size >= maxCheckpointMessageAddSize) {
                            persitanceAdapter.commitTransaction(context);
                            persitanceAdapter.beginTransaction(context);
                            size = 0;
                        }
                    }
                }

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                        }
                    }
                }


                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);


                // Checkpoint the removed messages.
                Iterator<MessageAck> iterator = cpRemovedMessageLocations.iterator();
                while (iterator.hasNext()) {
                    try {

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                        size += message.getSize();
                        message.decrementReferenceCount();
                        // Commit the batch if it's getting too big
                        if (size >= maxCheckpointMessageAddSize) {
                            persitanceAdapter.commitTransaction(context);
                            persitanceAdapter.beginTransaction(context);
                            size = 0;
                        }
                    }
                }

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                        }
                    }
                }


                persitanceAdapter.commitTransaction(context);
                persitanceAdapter.beginTransaction(context);


                // Checkpoint the removed messages.
                Iterator<MessageAck> iterator = cpRemovedMessageLocations.iterator();
                while (iterator.hasNext()) {
                    try {

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