public void prepareForSharedUse()

in core/src/main/java/org/apache/brooklyn/core/mgmt/persist/FileBasedObjectStore.java [187:283]
87 lines of code
24 McCabe index (conditional complexity)

    public void prepareForSharedUse(@Nullable PersistMode persistMode, HighAvailabilityMode haMode) {
        if (mgmt==null) throw new NullPointerException("Must inject ManagementContext before preparing "+this);
        
        if (persistMode==null || persistMode==PersistMode.DISABLED) {
            // TODO is this check needed? shouldn't come here now without persistence on.
            prepared = true;
            return;
        }
        
        @SuppressWarnings("deprecation")
        Boolean backups = mgmt.getConfig().getConfig(BrooklynServerConfig.PERSISTENCE_BACKUPS_REQUIRED);
        if (Boolean.TRUE.equals(backups)) {
            log.warn("Using legacy backup for "+this+"; functionality will be removed in future versions, in favor of promotion/demotion-specific backups to a configurable backup location.");
        }
        // default backups behaviour here changed to false, Nov 2014, because these backups are now legacy;
        // we prefer the made when persistence is enabled, using routines in BrooklynPersistenceUtils
        if (backups==null) backups = false; 

        File dir = getBaseDir();
        try {
            String persistencePath = dir.getAbsolutePath();

            switch (persistMode) {
            case CLEAN:
                if (dir.exists()) {
                    checkPersistenceDirAccessible(dir);
                    try {
                        if (backups) {
                            File old = backupDirByMoving(dir);
                            log.info("Persistence mode CLEAN, directory "+persistencePath+" backed up to "+old.getAbsolutePath());
                        } else {
                            deleteCompletely();
                            log.info("Persistence mode CLEAN, directory "+persistencePath+" deleted");
                        }
                    } catch (IOException e) {
                        throw new FatalConfigurationRuntimeException("Error using existing persistence directory "+dir.getAbsolutePath(), e);
                    }
                } else {
                    log.debug("Persistence mode CLEAN, directory "+persistencePath+", no previous state");
                }
                break;
            case REBIND:
                checkPersistenceDirAccessible(dir);
                checkPersistenceDirNonEmpty(dir);
                try {
                    if (backups) {
                        if (haMode==HighAvailabilityMode.MASTER) {
                            File backup = backupDirByCopying(dir);
                            log.info("Persistence mode REBIND, directory "+persistencePath+" backed up to "+backup.getAbsolutePath());                            
                        } else {
                            deferredBackupNeeded = true;
                        }
                    }
                } catch (IOException e) {
                    throw new FatalConfigurationRuntimeException("Error backing up persistence directory "+dir.getAbsolutePath(), e);
                }
                break;
            case AUTO:
                if (dir.exists()) {
                    checkPersistenceDirAccessible(dir);
                }
                if (dir.exists() && !isMementoDirExistButEmpty(dir)) {
                    try {
                        if (backups) {
                            if (haMode==HighAvailabilityMode.MASTER) {
                                File backup = backupDirByCopying(dir);
                                log.info("Persistence mode REBIND, directory "+persistencePath+" backed up to "+backup.getAbsolutePath());                            
                            } else {
                                deferredBackupNeeded = true;
                            }
                        }
                    } catch (IOException e) {
                        throw new FatalConfigurationRuntimeException("Error backing up persistence directory "+dir.getAbsolutePath(), e);
                    }
                } else {
                    log.debug("Persistence mode AUTO, directory "+persistencePath+", no previous state");
                }
                break;
            default:
                throw new FatalConfigurationRuntimeException("Unexpected persist mode "+persistMode+"; modified during initialization?!");
            };

            if (!dir.exists()) {
                boolean success = dir.mkdirs();
                if (success) {
                    FileUtil.setFilePermissionsTo700(dir);
                } else {
                    throw new FatalConfigurationRuntimeException("Failed to create persistence directory "+dir);
                }
            }

        } catch (Exception e) {
            throw Exceptions.propagate(e);
        }
        
        prepared = true;        
    }